Determining the fill level of a liquid reservoir in a laboratory device

Abstract

The invention relates to a laboratory device comprising at least one weighing device and a processing unit, wherein the at least one weighing device is designed to provide a signal indicative of the weight of a liquid in a liquid reservoir, and wherein the processing unit is designed to receive the signal provided by the at least one weighing device. The invention also relates to a method for determining the fill level of a liquid reservoir in a laboratory device.

Description

[0001] Determination of the fill level of a liquid reservoir in a laboratory device

[0002] The present invention relates to the field of laboratory devices with a liquid reservoir and can in particular relate to the determination of a fill level of the liquid reservoir.

[0003] Many laboratory devices require liquid (especially water), which is typically supplied via a corresponding liquid reservoir or, in some cases, via a liquid line. Examples of such laboratory devices include, in particular, laboratory devices in which the internal humidity is controlled or regulated, e.g., environmental chambers, (CO2) incubators, ovens, heating cabinets, incubators, etc.

[0004] If the liquid is provided via a liquid reservoir, it is necessary for the user to be able to determine the fill level, as this should not run dry during use. In known devices, the liquid reservoirs are often attached to the outside of the device in the form of a tank, so that the user can read the fill level using a simple scale on the tank. However, manual reading by the user is generally inaccurate and has so far only been sufficient because the consumption of the corresponding laboratory devices is relatively high, so that precise consumption measurement was not necessary because correspondingly large tanks were provided. Reading a scale, however, is complicated or even impossible if the liquid reservoir is not easily visible to the user, e.g., is located inside the laboratory device. In addition, the fill level data is only available in analog form. This meansThe disadvantage of existing laboratory equipment is that it does not currently provide digital recording of the fill level.

[0005] In principle, various methods are known for determining the fill level of a liquid reservoir, some of which, however, have not yet been used in laboratory devices. Commercial level gauges or sensors based on various measuring principles can generally be used. For example, the fill level can also be displayed and determined using a bypass indicator, particularly a bypass level indicator, via a glass tube or transparent hose.

[0006] Float switches can also be used to indicate fill levels on a display element. However, such float switches often do not cover the entire fill level range, but rather limit themselves to areas predetermined by the float switch's installation.

[0007] It is also known to determine fill levels using electrical conductivity, whereby electrical contact between two electrodes is established or interrupted by the liquid depending on the fill level. Similarly, optical sensors can be used to detect light absorption or the disappearance of total internal reflection when the sensor is immersed in the liquid. These methods are only suitable for determining individual, discrete fill levels and, in the case of measuring electrical conductivity, are limited to electrically conductive liquids.

[0008] Alternatively, the electrical capacitance between two electrodes can be measured, which depends on how far the electrodes are immersed in the liquid, so that continuous level measurement is possible.

[0009] Apart from the scale on the liquid reservoir, the disadvantage of all these methods is that the respective sensor comes into contact with the liquid so that the sensor and / or liquid can be contaminated and / or damaged, e.g. by corrosion on the sensor or impurities introduced into the liquid by the sensor.

[0010] Non-contact level measurements in large liquid tanks can be performed using ultrasonic sensors, for example. The propagation time of ultrasonic waves is measured to determine the distance between the liquid surface and the sensor, thus determining the fill level. However, this is relatively complex, often expensive, and requires precise calibration to determine the amount of liquid present from the height of the liquid surface. Furthermore, these sensors must also be installed within the liquid reservoir or above an open liquid reservoir. This can lead to contamination of the liquid and / or the sensor.

[0011] A further disadvantage of these known methods is that they depend to a greater or lesser extent on the exact positioning of the liquid reservoir. If the reservoir is not exactly horizontal, the level measurement can be affected, leading to greater measurement inaccuracy in the level determination. Furthermore, the known methods rely on the dimensions of the liquid reservoir being known and unchangeable, thus making the measurement methods unsuitable for liquid reservoirs in the form of a bag, for example.

[0012] Against this background, it is an object of the present invention to overcome or at least reduce the deficiencies and disadvantages of the prior art. In general, the object of the present invention may be to provide laboratory equipment or a method that enables continuous and digital detection of the fill level of a water reservoir.

[0013] The problem is solved by the subject matter of the independent patent claims. Advantageous developments of the invention are described by the dependent patent claims, the following description, and the figures.

[0014] One embodiment of the invention relates to a laboratory device comprising at least one weighing device and a processing unit, wherein the at least one weighing device is designed to provide a signal indicative of a weight of a liquid in a liquid reservoir, and wherein the processing unit is designed to receive the signal from the at least one weighing device. The laboratory device is thus designed to provide a signal indicative of a weight of a liquid in a liquid reservoir by means of at least one weighing device, e.g., a load cell, and to receive said signal in a processing unit. For example, the signal can indicate the weight of the liquid reservoir including the liquid contained therein and thus also the weight of the liquid.In principle, this can advantageously make it possible to at least approximately determine the volume of the liquid and thus determine the fill level of the liquid reservoir. Thus, the present invention advantageously makes it possible to dispense with sensors within the liquid reservoir and is also independent of the exact shape, stability, and further design of the liquid reservoir.

[0015] In embodiments of the invention, the liquid reservoir may be designed to provide the liquid. In other words, the liquid, e.g., water and in particular ultrapure water, may be provided by the liquid reservoir.

[0016] In embodiments of the invention, it can be provided that the laboratory device further comprises a receiving device which is designed to receive the liquid reservoir. In embodiments of the invention, it can be provided that the receiving device is connected to the at least one weighing device in such a way that the latter can provide the signal which is indicative of the weight of the liquid in the liquid reservoir received by the receiving device. In embodiments of the invention, it can be provided that the receiving device is a receiving plate. Alternatively, it can be provided that the receiving device is a receiving tray. The receiving device can be arranged in an interior of the laboratory device. In embodiments of the invention, it can be provided that the receiving device is not visible to the user during use of the laboratory device.

[0017] In embodiments of the invention, the laboratory device may comprise a plurality of weighing devices. In other words, in embodiments, the laboratory device may comprise at least two weighing devices. This may facilitate storage of the liquid reservoir or the receiving device on the weighing devices. Providing a plurality of weighing devices can advantageously increase the robustness and / or flexibility of the laboratory device.

[0018] In embodiments of the invention, it can be provided that the processing unit is designed to determine the fill level of the liquid reservoir on the basis of the signal from the at least one weighing device. In this case, it can be provided that the fill level is determined with an accuracy of up to ±50 ml, preferably up to ±10 ml, more preferably up to ±5 ml. Additionally or alternatively, it can be provided that the fill level is determined with an accuracy of up to 1%, preferably up to 0.2%, more preferably up to 0.1%. It can therefore be provided that the fill level can be determined with a high degree of accuracy compared to known fill level measurements (e.g. reading a scale), which advantageously makes it easier to estimate, for example, when the liquid reservoir needs to be refilled or replaced.In particular, it can be estimated, for example, whether there is still sufficient liquid for a planned process with the laboratory device, so that the available operating time of the laboratory device can be better utilized. In embodiments of the invention, it can be provided that the fill level is determined as a volume, for example in liters. Furthermore, it can be provided that the fill level is determined relative to a completely filled liquid reservoir. In other words, the fill level can be determined in relation to the completely filled liquid reservoir and is preferably specified as a percentage. Additionally or alternatively, the fill level can also be specified in ml, g or corresponding imperial units. Determining the fill level relative to a completely filled liquid reservoir is advantageously independent of otherwise used units for volume and / or weight.

[0019] In embodiments of the invention, it can be provided that the signal from the at least one weighing device is digital. Alternatively, it can be provided that the signal from the at least one weighing device is analog. Furthermore, it can be provided that the processing unit comprises a measuring amplifier designed to amplify the analog signal from the at least one weighing device. The processing unit can comprise an analog-to-digital converter designed to convert the analog signal from the at least one weighing device into a digital signal.

[0020] In embodiments of the invention, it can be provided that the processing unit is designed to output the fill level. In other words, it can be provided that the processing unit, for example, provides an output signal indicative of the fill level. This can advantageously enable the fill level to be stored, further processed, or visualized. For example, other processing units can access the current fill level and / or the fill level can be visualized using a display.

[0021] In embodiments of the invention, the processing unit can be designed to store the fill level. This can advantageously enable statistical analyses of the fill level over time and, for example, in relation to processes performed with the laboratory device, which can, for example, enable a more accurate consumption forecast.

[0022] In embodiments of the invention, it can be provided that the laboratory device comprises a display unit. Furthermore, it can be provided that the laboratory device is designed to visualize the fill level using the display unit. This can advantageously enable immediate feedback about the fill level to be provided to a user of the laboratory device. The display unit can comprise a screen. In embodiments of the invention, it can be provided that the laboratory device comprises the liquid reservoir. In other words, the liquid reservoir can be a component of the laboratory device. It is understood that the liquid reservoir can nevertheless be replaceable.

[0023] In embodiments of the invention, the liquid reservoir can be arranged inside the laboratory device. Furthermore, the liquid reservoir can be arranged behind a panel. In embodiments of the invention, the liquid reservoir can be hidden from view by the user during use of the laboratory device.

[0024] In embodiments of the invention, the laboratory device may comprise a drawer designed to accommodate the liquid reservoir. In other words, the laboratory device may comprise a drawer in which the liquid reservoir can be placed or is placed. This can advantageously allow the liquid reservoir to be housed inside the laboratory device and not be visible or tampered with during use, while simultaneously allowing relatively easy access to the liquid reservoir by opening the drawer.

[0025] It can be provided that the at least one weighing device is arranged outside the drawer. In corresponding embodiments, it can be provided that the weighing device accordingly provides a signal that (at least partially) also includes the weight of the drawer.

[0026] The at least one weighing device and the drawer can be arranged such that the drawer is partially supported on the at least one weighing device when closed. The at least one weighing device and the drawer can be arranged such that, in the closed state, part of the weight of the drawer acts on the at least one weighing device. The part of the weight that acts on the at least one weighing device can be between 10% and 90%, preferably between 30% and 70%, more preferably between 40% and 60%, e.g., 50% of the weight. In other words, it can be provided that the drawer is partially supported on the at least one weighing device when closed, e.g., by part of the drawer resting on the at least one weighing device or a section connected thereto.Furthermore, it can be provided that the drawer is not supported on the at least one weighing device when opened. In other words, it can be provided that the drawer does not act on the at least one weighing device when opened.

[0027] In particular, it can be provided that the drawer is mounted on at least one slide rail, and wherein the at least one slide rail is mounted sloping in a closing direction of the drawer. This can advantageously enable the drawer to slide accordingly on the at least one slide rail when closing and thus to be lowered. In particular, this can enable the drawer to be lowered towards the at least one weighing device during the transition from the open to the closed state, so that it is connected to the at least one weighing device or partially mounted on it and thus acts on the at least one weighing device.

[0028] In embodiments of the invention, it can be provided that the drawer is connected to the at least one weighing device in such a way that the latter can provide the signal which is indicative of the weight of the liquid in the liquid reservoir held by the drawer

[0029] In embodiments of the invention, it can be provided that the at least one weighing device is arranged within the drawer. In other words, the at least one weighing device can be arranged within the drawer, and the liquid reservoir can be mounted on it, for example, directly or by means of a receiving device.

[0030] In embodiments of the invention, it can be provided that the drawer and the at least one weighing device are arranged such that the at least one weighing device can provide the signal, which is indicative of the weight of the liquid in the liquid reservoir held by the drawer, at least in the closed state of the drawer.

[0031] In embodiments of the invention, the liquid reservoir may be a tank. Alternatively, the liquid reservoir may be a bag. In particular, for bags, the present invention, in contrast to the prior art, enables reliable level detection, since the weight is independent of deformations of the bag and, in particular, the present invention is independent of the volume distribution within the liquid reservoir.

[0032] In embodiments of the invention, it can be provided that the liquid comprises water and in particular is water.

[0033] In embodiments of the invention, it can be provided that the volume of the liquid reservoir is a maximum of 10 l, preferably a maximum of 7.5 l, more preferably a maximum of 5 l. In embodiments of the invention, it can be provided that the liquid reservoir has a connection for liquid withdrawal. In embodiments of the invention, it can be provided that the liquid reservoir does not include a sensor.

[0034] In embodiments of the invention, it can be provided that the laboratory device comprises a chamber. Furthermore, it can be provided that the laboratory device is designed to control or regulate the air humidity in the chamber. It can be provided that the laboratory device is designed to control or regulate the temperature in the chamber. In embodiments of the invention, it can be provided that the laboratory device is a climatic chamber. In embodiments of the invention, it can be provided that the laboratory device is an incubator, for example a CCh incubator. In embodiments of the invention, it can be provided that the laboratory device is at least one of a heating cabinet, an incubator, and / or an oven.

[0035] In embodiments of the invention, it can be provided that the processing unit comprises at least one processor.

[0036] In embodiments of the invention, it can be provided that the at least one weighing device comprises a load cell. It can be provided that the at least one weighing device is a load cell.

[0037] In embodiments of the invention, the laboratory device may include an evaporator designed to withdraw liquid from the liquid reservoir and evaporate it. Furthermore, the evaporator may be designed to increase the humidity in the chamber. The evaporator may be controlled or regulated by the processing unit.

[0038] In embodiments of the invention, the signal can be indicative of the weight with an accuracy of up to ±50 g, preferably up to ±10 g, more preferably up to ±5 g. The signal can be indicative of the weight with an accuracy of up to 1%, preferably up to 0.2%, more preferably up to 0.1%. In other words, the signal can indicate the weight with a corresponding maximum deviation.

[0039] One embodiment of the invention relates to a method for determining the fill level of a liquid reservoir in a laboratory device. The method comprises receiving at least one signal indicative of the weight of a liquid in a liquid reservoir and determining the fill level of the liquid reservoir based on the at least one signal. In other words, according to the method according to the invention, the fill level of the liquid reservoir is determined based on at least one signal indicative of the weight of the liquid in the liquid reservoir.

[0040] In embodiments of the invention, it can be provided that the laboratory device is a laboratory device as described above.

[0041] In embodiments of the invention, it can be provided that the step of determining the fill level takes into account an empty weight of the liquid reservoir. Furthermore, it can be provided that the method comprises determining the empty weight of the liquid reservoir. Alternatively, it can be provided that the method comprises receiving the empty weight of the liquid reservoir. In embodiments of the invention, it can be provided that determining the fill level comprises determining the weight of the liquid in the liquid reservoir based on the at least one signal. For example, the weight of the liquid in the liquid reservoir can first be determined based on the signal. The weight can then advantageously provide conclusions about the volume of the liquid and / or the fill level.

[0042] In embodiments of the invention, it can be provided that the determination of the fill level is based at least on the weight of the liquid in the liquid reservoir and preferably on the density of the liquid. In addition, the determination of the fill level can also be based on other parameters or variables, such as the empty weight of the reservoir and / or a receiving device.

[0043] In embodiments of the invention, the method may further comprise visualizing the fill level. Visualizing the fill level may comprise displaying the fill level.

[0044] In embodiments of the invention, the method may further comprise predicting fluid consumption of the laboratory device. Furthermore, the method may comprise predicting fluid consumption during a process performed by the laboratory device.

[0045] In embodiments of the invention, the method may further comprise storing fill level data, wherein the fill level data may be associated with processes performed by the laboratory device. The fill level data may include information about the temporal progression of the fill level. Predicting fluid consumption may take stored fill level data into account. Furthermore, the method may comprise statistical learning based on the stored fill level data.

[0046] In embodiments of the invention, it can be provided that the storage of fill level data also includes the storage of at least one process parameter. It can be provided that the prediction of liquid consumption takes into account at least one process parameter. The at least one process parameter can include at least one of the following: air humidity, process duration, temperature, and evaporator throughput.

[0047] In embodiments of the invention, the method may further comprise a request for refilling based on the prediction of the liquid consumption and the determined fill level.

[0048] In embodiments of the invention, the method may further comprise calibrating the at least one signal indicative of a weight of a liquid in a liquid reservoir. In other words, the signal can be calibrated, for example, using a calibration weight or a fluid reservoir with a known weight. This can advantageously allow a corresponding signal to be related to the associated weight, so that a relationship between signal and weight can be determined by means of the calibration, which makes it possible to determine the weight of the liquid in the liquid reservoir based on the received signal.

[0049] In embodiments of the invention, it can be provided that the weight is determined with an accuracy of up to ±50 g, preferably up to ±10 g, more preferably up to ±5 g. Additionally or alternatively, it can be provided that the weight is determined with an accuracy of up to 1%, preferably up to 0.2%, more preferably up to 0.1%.

[0050] In embodiments of the invention, it can be provided that the fill level is determined with an accuracy of up to ±50 ml, preferably up to ±10 ml, more preferably up to ±5 ml. Additionally or alternatively, it can be provided that the fill level is determined with an accuracy of up to 1%, preferably up to 0.2%, more preferably up to 0.1%.

[0051] In embodiments of the invention, it can be provided that the processing unit of the laboratory device is designed to carry out the method described above.

[0052] The following refers to laboratory device embodiments. These embodiments are identified by an L followed by a number. When reference is made to laboratory device embodiments or L-embodiments, these embodiments are meant.

[0053] LI. Laboratory device comprising at least one weighing device and a processing unit; wherein the at least one weighing device is configured to provide a signal indicative of a weight of a liquid in a liquid reservoir; and wherein the processing unit is configured to receive the signal from the at least one weighing device.

[0054] L2. Laboratory device according to the preceding embodiment, wherein the liquid reservoir is designed to provide the liquid.

[0055] L3. Laboratory device according to one of the preceding embodiments, wherein the laboratory device further comprises a receiving device configured to receive the liquid reservoir.

[0056] L4. Laboratory device according to the preceding embodiment, wherein the receiving device is connected to the at least one weighing device in such a way that the latter can provide the signal which is indicative of the weight of the liquid in the liquid reservoir received by the receiving device.

[0057] L5. Laboratory device according to one of the two preceding embodiments, wherein the receiving device is a receiving plate.

[0058] L6. Laboratory device according to embodiment L3 or L4, wherein the receiving device is a receiving tray.

[0059] L7. Laboratory device according to one of the four preceding embodiments, wherein the receiving device is arranged in an interior of the laboratory device.

[0060] L8. Laboratory device according to the preceding embodiment, wherein the receiving device is not visible to the user during use of the laboratory device.

[0061] L9. Laboratory device according to one of the preceding embodiments, wherein the

[0062] Laboratory equipment includes a plurality of weighing devices.

[0063] LIO. Laboratory device according to one of the preceding embodiments, wherein the processing unit is configured to determine the fill level of the liquid reservoir based on the signal from the at least one weighing device.

[0064] Lil. Laboratory device according to the preceding embodiment, wherein the fill level is determined with an accuracy of up to ±50 ml, preferably up to ±10 ml, more preferably up to ±5 ml.

[0065] L12. Laboratory device according to one of the two preceding embodiments, wherein the fill level is determined with an accuracy of up to 1%, preferably up to 0.2%, more preferably up to 0.1%.

[0066] L13. Laboratory device according to one of the three preceding embodiments, wherein the fill level is determined as a volume, for example in liters.

[0067] L14. Laboratory device according to one of the four preceding embodiments, wherein the fill level is determined relative to a completely filled liquid reservoir.

[0068] L15. Laboratory device according to one of the preceding embodiments, wherein the signal of the at least one weighing device is digital.

[0069] L16. Laboratory device according to one of the preceding embodiments, excluding embodiment L14, wherein the signal of the at least one weighing device is analog. L17. Laboratory device according to the preceding embodiment, wherein the processing unit comprises a measuring amplifier configured to amplify the analog signal of the at least one weighing device.

[0070] L18. Laboratory device according to one of the two preceding embodiments, wherein the processing unit comprises an analog-to-digital converter configured to convert the analog signal of the at least one weighing device into a digital signal.

[0071] L19. Laboratory device according to one of the preceding embodiments, wherein the

[0072] Processing unit is designed to output the fill level.

[0073] L20. Laboratory device according to one of the preceding embodiments, wherein the

[0074] Processing unit is designed to store the fill level.

[0075] L21. Laboratory device according to one of the preceding embodiments, wherein the

[0076] Laboratory device includes a display unit.

[0077] L22. Laboratory device according to the preceding embodiment, wherein the laboratory device is designed to visualize the fill level by means of the display unit.

[0078] L23. Laboratory device according to one of the two preceding embodiments, wherein the display unit comprises a screen.

[0079] L24. Laboratory device according to one of the preceding embodiments, wherein the

[0080] Laboratory device that includes a liquid reservoir.

[0081] L25. Laboratory device according to one of the preceding embodiments, wherein the

[0082] Liquid reservoir is located inside the laboratory device.

[0083] L26. Laboratory device according to the preceding embodiment, wherein the liquid reservoir is arranged behind a diaphragm.

[0084] L27. Laboratory device according to one of the preceding embodiments, wherein the liquid reservoir is not visible to the user during use of the laboratory device.

[0085] L28. Laboratory device according to one of the preceding embodiments, wherein the laboratory device comprises a drawer configured to receive the liquid reservoir.

[0086] L29. Laboratory device according to the preceding embodiment, wherein the at least one weighing device is arranged outside the drawer.

[0087] L30. Laboratory device according to one of the two preceding embodiments, wherein the at least one weighing device and the drawer are arranged such that the drawer is partially supported on the at least one weighing device in a closed state.

[0088] L31. Laboratory device according to one of the three preceding embodiments, wherein the at least one weighing device and the drawer are arranged such that, in the closed state, part of the weight force of the drawer acts on the at least one weighing device.

[0089] L32. Laboratory device according to the preceding embodiment, wherein the part of the weight force acting on the at least one weighing device is between 10% and 90%, preferably between 30% and 70%, more preferably between 40% and 60%, e.g. 50% of the weight force.

[0090] L33. Laboratory device according to one of the three preceding embodiments, wherein the drawer is not mounted on the at least one weighing device in an open state.

[0091] L34. Laboratory device according to one of the 6 preceding embodiments, wherein the drawer is mounted on at least one slide rail, and wherein the at least one slide rail is mounted sloping in a closing direction of the drawer.

[0092] L35. Laboratory device according to embodiment L28, wherein the drawer is connected to the at least one weighing device such that it can provide the signal indicative of the weight of the liquid in the liquid reservoir held by the drawer

[0093] L36. Laboratory device according to embodiment L28, wherein the at least one weighing device is arranged within the drawer.

[0094] L37. Laboratory device according to one of the 9 preceding embodiments, wherein the drawer and the at least one weighing device are arranged such that the at least one weighing device can provide the signal which is indicative of the weight of the liquid in the liquid reservoir held by the drawer, at least in the closed state of the drawer.

[0095] L38. Laboratory device according to one of the preceding embodiments, wherein the liquid reservoir is a tank.

[0096] L39. Laboratory device according to one of the preceding embodiments with the exception of embodiment L38, wherein the liquid reservoir is a bag.

[0097] L40. Laboratory device according to one of the preceding embodiments, wherein the liquid comprises water and in particular is water. L41. Laboratory device according to one of the preceding embodiments, wherein a volume of the liquid reservoir is a maximum of 10 l, preferably a maximum of 7.5 l, more preferably a maximum of 5 l.

[0098] L42. Laboratory device according to one of the preceding embodiments, wherein the liquid reservoir has a connection for liquid withdrawal.

[0099] L43. Laboratory device according to one of the preceding embodiments, wherein the

[0100] Liquid reservoir does not contain a sensor.

[0101] L44. Laboratory device according to one of the preceding embodiments, wherein the

[0102] Laboratory device contains a chamber.

[0103] L45. Laboratory device according to the preceding embodiment, wherein the laboratory device is designed to control or regulate the humidity in the chamber.

[0104] L46. Laboratory device according to one of the two preceding embodiments, wherein the laboratory device is designed to control or regulate the temperature in the chamber.

[0105] L47. Laboratory device according to one of the preceding embodiments, wherein the

[0106] Laboratory equipment is a climate chamber.

[0107] L48. Laboratory device according to one of the preceding embodiments, wherein the

[0108] Laboratory equipment is an incubator, for example a CCh incubator.

[0109] L49. Laboratory device according to one of the preceding embodiments, wherein the

[0110] Laboratory equipment is at least one of a heating cabinet, incubator and / or oven.

[0111] L50. Laboratory device according to one of the preceding embodiments, wherein the

[0112] Processing unit comprises at least one processor.

[0113] L51. Laboratory device according to one of the preceding embodiments, wherein the at least one weighing device comprises a load cell.

[0114] L52. Laboratory device according to one of the preceding embodiments, wherein the at least one weighing device is a load cell.

[0115] L53. Laboratory device according to one of the preceding embodiments, wherein the

[0116] Laboratory device includes an evaporator designed to remove liquid from the

[0117] To remove the liquid reservoir and evaporate it.

[0118] L54. Laboratory device according to the preceding embodiment and having the features of embodiment L44, wherein the evaporator is configured to increase the humidity in the chamber. L55. Laboratory device according to one of the two preceding embodiments, wherein the evaporator is controlled or regulated by the processing unit.

[0119] L56. Laboratory device according to one of the preceding embodiments, wherein the signal is indicative of the weight with an accuracy of up to ±50 g, preferably up to ±10 g, more preferably up to ±5 g.

[0120] L57. Laboratory device according to one of the preceding embodiments, wherein the signal is indicative of the weight with an accuracy of up to 1% Z preferably up to 0.2%, more preferably up to 0.1%.

[0121] In the following, reference is made to method embodiments. These embodiments are identified by an M followed by a number. Whenever reference is made to method embodiments or M-embodiments, these embodiments are meant.

[0122] Ml. Method for determining the fill level of a liquid reservoir in a laboratory device, the method comprising:

[0123] Receiving at least one signal indicative of a weight of a liquid in a liquid reservoir,

[0124] Determining the fill level of the liquid reservoir based on the at least one signal.

[0125] M2. Method according to the preceding method embodiment, wherein the laboratory device is a laboratory device according to one of the preceding laboratory device embodiments.

[0126] M3. Method according to one of the preceding method embodiments, wherein the step of determining the fill level takes into account an empty weight of the liquid reservoir.

[0127] M4. Method according to the preceding method embodiment, wherein the method further comprises determining the empty weight of the liquid reservoir.

[0128] M5. The method according to method embodiment M3, wherein the method further comprises receiving the empty weight of the liquid reservoir.

[0129] M6. Method according to one of the preceding method embodiments, wherein determining the fill level comprises determining the weight of the liquid in the liquid reservoir based on the at least one signal.

[0130] M7. Method according to one of the preceding method embodiments, wherein the determination of the fill level is based at least on the weight of the liquid in the liquid reservoir and preferably on a density of the liquid. Additionally, the determination of the fill level can also be based on further parameters or variables, such as the empty weight of the reservoir and / or a receiving device.

[0131] M8. Method according to one of the preceding method embodiments, wherein the method further comprises visualizing the fill level.

[0132] M9. Method according to the preceding method embodiment, wherein visualizing the fill level comprises displaying the fill level.

[0133] MIO. Method according to any of the preceding method embodiments, wherein the method further comprises predicting a fluid consumption of the laboratory device.

[0134] Mil. Method according to the preceding method embodiment, the method further comprising predicting fluid consumption during a process performed by the laboratory device.

[0135] M12. Method according to one of the preceding method embodiments, wherein the method further comprises storing fill level data.

[0136] M13. Method according to the preceding method embodiment, wherein the fill level data are associated with processes performed by the laboratory device.

[0137] M14. Method according to one of the two preceding method embodiments, wherein the fill level data comprise information about the temporal progression of the fill level.

[0138] M15. Method according to one of the three preceding method embodiments and having the features of method embodiments M10, wherein the prediction of the liquid consumption takes stored fill level data into account.

[0139] M16. Method according to one of the four preceding method embodiments and having the features of method embodiment M10, wherein the method comprises statistical learning based on the stored fill level data.

[0140] M17. Method according to one of the five preceding method embodiments, wherein storing fill level data also comprises storing at least one process parameter.

[0141] M18. Method according to one of the preceding method embodiments and having the features of method embodiment M10, wherein predicting the liquid consumption takes into account at least one process parameter. M19. Method according to one of the two preceding method embodiments, wherein the at least one process parameter comprises at least one of the following: air humidity, process duration, temperature, and evaporator flow rate.

[0142] M20. Method according to one of the preceding method embodiments and having the features of method embodiment M10, wherein the method further comprises a request for refilling based on the prediction of the fluid consumption and the determined fill level.

[0143] M21. The method according to any one of the preceding method embodiments, wherein the method further comprises calibrating the at least one signal indicative of a weight of a liquid in a liquid reservoir.

[0144] M22. Method according to one of the preceding method embodiments and having the features of M6, wherein the weight is determined with an accuracy of up to ±50 g, preferably up to ±10 g, more preferably up to ±5 g.

[0145] M23. Method according to one of the preceding method embodiments and having the features of M6, wherein the weight is determined with an accuracy of up to 1%, preferably up to 0.2%, more preferably up to 0.1%.

[0146] M24. Method according to one of the preceding method embodiments, wherein the fill level is determined with an accuracy of up to ±50 ml, preferably up to ±10 ml, more preferably up to ±5 ml.

[0147] M25. Method according to one of the preceding method embodiments, wherein the fill level is determined with an accuracy of up to 1%, preferably up to 0.2%, more preferably up to 0.1%.

[0148] L58. Laboratory device according to one of the preceding laboratory device embodiments, wherein the processing unit is designed to carry out the method according to one of the preceding method embodiments.

[0149] Embodiments of the present invention will now be described with reference to the accompanying drawings. These embodiments are intended to illustrate the present invention only by way of example and not by way of limitation.

[0150] Fig. 1 shows an exemplary embodiment of a laboratory device according to the invention;

[0151] Fig. 2 shows an exemplary arrangement of a weighing device;

[0152] Fig. 3 shows an exemplary arrangement of a weighing device in a drawer;

[0153] Figs. 4a & 4b show an exemplary embodiment with a drawer mounted on sloping slide rails; and

[0154] Fig. 5 shows an exemplary embodiment of a method according to the invention. It should be noted that not all drawings bear all reference numerals. Instead, in some of the drawings, some of the reference numerals have been omitted for the sake of brevity and simplicity of illustration. Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0155] With reference to Figure 1, an exemplary embodiment of a laboratory device 1 according to the invention is described. The laboratory device 1 comprises at least one weighing device 11, which is designed to provide a signal indicative of a weight of a liquid in a liquid reservoir 12. Furthermore, the laboratory device 1 comprises a processing unit 14, which is designed to receive the signal from the at least one weighing device 11. In principle, the processing unit 14 can therefore receive a signal from the weighing device 11, e.g., via a wired connection (indicated by the dashed line). The signal is indicative of a weight of a liquid in a liquid reservoir. For example, the signal can correspond to a weight measured by the weighing device 11.

[0156] The laboratory device may, for example, comprise a chamber 10 and be designed to control conditions in the chamber 10, e.g., climate conditions. In particular, the laboratory device may be designed (among other things) to control or regulate the humidity in the chamber 10. Objects may be placed in the chamber 10 to expose them to the controlled conditions. The laboratory device may therefore be, for example, a climate chamber, a CChJ incubator, a heating or incubating cabinet, or the like.

[0157] In order to control the air humidity, for example, liquid can be provided within the chamber 10, which then evaporates within the chamber or the liquid can be evaporated by means of an evaporator 15 and then introduced into the chamber 10. The liquid can comprise water and in particular be water, e.g. ultrapure water. The liquid reservoir 12 can, for example, be a tank or a bag; in particular, the liquid reservoir 12 can also be a consumable, i.e., it can be replaced regularly, and the volume of the liquid reservoir can be limited to a maximum of 10 l, preferably a maximum of 7.5 l, more preferably a maximum of 5 l. Since, according to the invention, no sensors are required directly on or in the liquid reservoir, the liquid reservoir 12 can advantageously be particularly easy to clean; in particular, the liquid reservoir can be autoclavable.

[0158] In the exemplary embodiment shown, the laboratory device comprises an evaporator 15, which can withdraw liquid from the liquid reservoir 12, i.e. is fluidly connected thereto (connection 121). For this purpose, the liquid reservoir can have a connection for liquid withdrawal. The evaporator 15 can then introduce the liquid vapor into the chamber 10 by means of a further fluidic connection 151. In order to control the air humidity, the evaporator 15 can be controlled by the processing unit 14. For this purpose, this can also be connected to sensors in the climatic chamber 10 (indicated by a dashed line). The embodiment of the laboratory device 1 shown in Fig. 1 is purely exemplary, and not all embodiments of the present invention comprise all the elements shown therein; for example, the laboratory device 1 according to the invention does not have to have an evaporator 15 in every embodiment.

[0159] Furthermore, the liquid reservoir 12 can be arranged within the laboratory device. In particular, the liquid reservoir 12 can be arranged such that it is not visible to the user during use of the laboratory device 1, e.g., the liquid reservoir can be arranged behind a panel or in a drawer.

[0160] The laboratory device can additionally comprise a receiving device 13 designed to receive the liquid reservoir 12. For this purpose, the receiving device can be connected to the at least one weighing device 11 in such a way that the latter can provide the corresponding signal indicative of the weight of the liquid in the liquid reservoir 12 received by the receiving device 13. The receiving device can, for example, be a receiving plate on which the liquid reservoir 12 can be placed. Alternatively, the receiving device 13 can also be, for example, a receiving tray. The receiving device 13 can also be arranged inside the laboratory device 1 and, in particular, not be visible to the user during use.

[0161] The processing unit 14 can be designed to determine the fill level of the liquid reservoir based on the signal from the at least one weighing device 11. In particular, the processing unit 14 can, for example, take into account the density of the liquid stored in the liquid reservoir 12, determine the volume of the liquid, which can then be provided as a fill level, e.g., in liters. Additionally or alternatively, the fill level can also be determined as a relative value with respect to a completely filled container. A corresponding relative value can, for example, also be determined without determining the volume and therefore also without knowledge of the density. In particular, the weight of the liquid can be set in relation to the weight of the liquid when the liquid reservoir 12 is completely filled.It is understood that, based on the knowledge of the liquid volume of the completely filled liquid reservoir 12 and based on the relative amount of liquid, the volume can be deduced, even without knowing the density. The fill level can be determined by the processing unit 14 with an accuracy of 1%, preferably 0.2%, more preferably 0.1%. Additionally or alternatively, the fill level can be determined by the processing unit 14 with an accuracy of up to ±50 ml, preferably up to ±10 ml, more preferably up to ±5 ml. This is advantageously significantly more accurate than, for example, using a scale attached to the liquid reservoir.

[0162] The signal from the weighing device 11 can be digital and, for example, correspond to a weight detected by the weighing device 11. Alternatively, the signal can also be analog, for example, a voltage proportional to a detected weight. In the case of an analog signal, the processing unit 14 can comprise a measuring amplifier for amplifying the analog signal and / or an analog-to-digital converter that can convert the analog signal into a digital signal.

[0163] Furthermore, the processing unit 14 can be designed to output the fill level. For example, the processing unit 14 can provide the fill level as a digital or analog signal via a corresponding interface. This can make it possible for the fill level to be accessible outside the laboratory device 1 and, for example, to be processed by a data processing device and stored, for example, in an external database. However, the processing unit 14 can also be designed to store the fill level itself, for example in a memory within the laboratory device 1, in particular in a memory that is comprised by the processing unit 14. This can advantageously make it possible for the processing unit 14 to also retrieve older fill levels and thus, for example, to map and / or analyze a temporal development of the fill level.This allows fluid consumption from different processes to be analyzed and, for example, future consumption to be estimated or predicted.

[0164] The laboratory device 1 can also comprise a display unit and be designed to visualize the fill level by means of the display unit. A display unit can, for example, comprise one or more LEDs that visualize the fill level via color, brightness and / or on / off state. Likewise, the display unit can comprise a display or a screen, e.g. an LCD screen, on which the fill level can be visualized. The fill level can, for example, be visualized continuously, e.g. as a graph that shows the time course. Additionally or alternatively, the fill level can be visualized by displaying the remaining volume or the relative fill level. Likewise, warnings can be issued, e.g. by a red LED or by text on a display, which can, for example, indicate a critical fill level.

[0165] The processing unit 14 can comprise at least one processor, e.g., a CPU, a GPU, an FPGA, or a microprocessor. This processor can be configured to determine the fill level of the liquid reservoir 12 based on the signal from the at least one weighing device 11. Furthermore, the processing unit 14 can comprise at least one memory, e.g., RAM, ROM, EPROM, EEPROM, flash memory, or even an SSD or HDD memory. The processing unit 14 can also comprise one or more microchips.

[0166] With reference to Fig. 2, embodiments of the present invention are based on the idea of ​​determining the fill level of a liquid reservoir 12 (e.g., a container) within a laboratory device 1 by means of at least one weighing device 11 designed to provide a signal to a processing unit 14, on the basis of which the fill level can be determined. The signal is indicative of a weight of the liquid in a liquid reservoir 12. For example, the signal can be proportional to the weight of the liquid reservoir 12 and the liquid contained therein, and thus also proportional to the weight of the liquid, since the weight of the liquid reservoir 12 is constant.

[0167] As shown in Fig. 2 by way of example, the weighing device 11 is arranged in particular in such a way that it can provide a corresponding signal. The weighing device can

[0168] 11 preferably be a load cell 11. The laboratory device can also comprise two or more weighing devices 11 or load cells 11. The weighing device 11 is arranged such that a signal depending on the weight of the liquid reservoir

[0169] 12 and in particular the liquid contained therein. For example, the weighing device 11 or load cell 11 can comprise a spring body that deforms under the action of a weight. This deformation can then be detected via a strain gauge and converted into an electrical signal.

[0170] As already mentioned, the laboratory device 1 can comprise a receiving device 13 which is designed to receive the liquid reservoir 12 - for example, by placing the liquid reservoir 12 on the receiving device 13. As shown by way of example in Fig. 2, the receiving device 13 can in particular be connected to the at least one weighing device 11 in such a way that the latter can provide the corresponding signal. For example, the weighing device 11 can be arranged between the receiving device 13 and a component 16 of the laboratory device 1, e.g. a frame of the laboratory device, in such a way that it can detect the weight of the receiving device 13 and the liquid reservoir 12 mounted thereon. Figure 2 schematically shows the arrangement of a load cell 11, which is attached at one end to the receiving device 13 and at an opposite end to a component 16 of the laboratory device 1.

[0171] In other words, the liquid reservoir 12 can be placed on a support plate 13 or weighing plate 13. The weight can then be transmitted to the load cell 11 via a mounting point. The opposite side of the load cell 11 can be attached to the laboratory device, e.g., to its base. The information can then be transmitted from the load cell 11, e.g., as a digital or analog signal.

[0172] Fig. 3 shows a further exemplary embodiment in which the liquid reservoir 12 is placed within a drawer 17. In this embodiment, the (at least one) weighing device 11 is also arranged such that a signal can be provided depending on the weight of the liquid reservoir 12 and, in particular, the liquid contained therein. In particular, the weighing device 11 can be arranged between the liquid reservoir 12 and the drawer 17 such that it can provide a corresponding signal, e.g., based on the acting weight of the liquid reservoir 12.

[0173] Preferably, a receiving device 13 is also provided, which is designed to receive the liquid reservoir 12. The weighing device 11 can then be arranged between the drawer 17 and the receiving device 13 and connected to them, so that a weight of the liquid reservoir 12 and the receiving device 13 can be detected by the weighing device 11 and a corresponding signal can be provided.

[0174] In other words, the embodiment shown in Fig. 3 corresponds to the embodiment shown in Fig. 2, wherein the general component 16 of the laboratory device in this case is specifically a drawer of the laboratory device. This embodiment advantageously allows the liquid reservoir to be placed within the laboratory device and, at the same time, ensures easy access to the liquid reservoir by opening the drawer. The drawer 17 accordingly enables uncomplicated and simple replacement or refilling of the liquid reservoir 12.

[0175] Alternatively (not shown), the entire drawer 17 can be connected to the at least one weighing device 11 (e.g., mounted thereon) in such a way that the weighing device 11 can detect the weight of the liquid reservoir 12, including the drawer 17 and an optional receiving device 13, and provide a corresponding signal. This can advantageously allow the weighing device 11 not to be directly connected to moving parts and to remain within the laboratory device even when the drawer 17 is opened.

[0176] A further exemplary embodiment with a drawer 17 is shown schematically in Figures 4 a) and 4 b). In this embodiment, the drawer 17 is mounted on at least one downwardly mounted slide rail 18. This means that the at least one slide rail has a negative gradient in the x-direction. As a result, one end of the drawer 17, including the liquid reservoir 12, can be placed on the weighing device 11, while the other end (and other sections) continues to be mounted on the at least one slide rail 18. This also makes it possible to provide a signal by means of the weighing device 11 which is indicative of the weight of a liquid in the liquid reservoir 12. In particular, the drawer 17 with the liquid reservoir 12 in the pushed-in position is mounted on the one hand on the weighing device 11 and on the other hand continues to be mounted on the slide rail.

[0177] In principle, this makes it possible for a portion of the weight force exerted by the drawer 17 and the liquid reservoir 12 stored therein to act on the at least one weighing device 11. The remaining portion of the weight force is absorbed by the mounting of the drawer 17 on the at least one slide rail 18. The portion of the weight force acting on the at least one weighing device 11 can be between 10% and 90%, preferably between 30% and 70%, more preferably between 40% and 60%, e.g. 50%. It is understood that the exact portion of the weight force acting on the at least one weighing device 11 depends on the mounting of the drawer on the at least one slide rail and the at least one weighing device 11.

[0178] Determining the total weight of the drawer using the signal provided by the at least one weighing device 11 can be achieved, for example, through calibration. This allows determining which portion of the weight force is absorbed by the at least one weighing device 11. For example, a calibration weight can be placed in the drawer 17, or a liquid reservoir whose weight is known, so that the portion of the weight force absorbed by the weighing device can be determined based on this. This portion can be independent of the absolute weight and determined solely by the appropriate mounting of the drawer on the at least one slide rail and the at least one weighing device.

[0179] In other words, the weighing device 11, slide rail 18, and drawer 17 can, for example, be arranged such that the drawer 17 is supported at least two points, preferably horizontally, in the retracted position. In particular, the drawer is thus supported on the slide rail 18 and on the weighing device 11, so that a portion of the weight of the drawer 17 (including the liquid reservoir 12) acts on the weighing device 11 (for example, half of the weight). This allows the weight of the liquid reservoir 12, and in particular of a liquid contained therein, to be determined accordingly.

[0180] Figure 4 a) shows the drawer 17 in a position between an open and a closed state or a pushed-in position. If the drawer 17 is moved further towards the closed state, i.e. the pushed-in position, the drawer 17 is not only pushed in due to the slide rail 18 mounted sloping in this direction, but is also lowered compared to the open state. In other words, a movement of the drawer in the x-direction simultaneously leads to a movement of the drawer in the negative y-direction, i.e. the drawer moves downwards. As a result, this makes it possible to support the drawer 17 on the at least one weighing device 11 and / or a drawer receptacle 19 encompassed by the weighing device 11.

[0181] The drawer receptacle 19 can be configured to include a receiving portion 19-1 designed to receive a portion of the drawer 17 when the drawer 17 assumes the inserted position, i.e., the closed state. In other words, it can be provided that the drawer 17 is at least partially supported on the receiving portion 19-1 in the closed state, so that part of the weight of the drawer acts on the receiving portion 19-1 and thus on the weighing device 11.

[0182] In embodiments of the present invention, the drawer receptacle 19 can comprise an angled section 19-2, which is angled with respect to the receiving section 19-1 and slopes down in the direction of the drawer. Ie, the angled section 19-2 has a positive slope in the x-direction. This can advantageously facilitate the mounting of the drawer on the receiving section 19-1, since the drawer 17 can be guided or directed onto the receiving section 19-1 by means of the angled section 19-2. In particular, it can be provided that the drawer 17 is initially mounted somewhat lower than the receiving section 19-1 when pushed in. Ie, the receiving section 19-1 can be offset in the (positive) y-direction relative to the drawer 17. By means of the angled section 19-2, which has a positive slope for the drawer 17 in the direction of the receiving section 19-1 (i.e.in the x-direction), this can be guided via the angled section 19-2 onto the receiving section 19-1, which is pressed downwards by the drawer and in particular its weight (i.e. in the negative y-direction). In this way, it can advantageously be ensured that the drawer 17 is partially mounted on the weighing device 11 and in particular its drawer receptacle 19 and a corresponding weight can be detected by the weighing device. Fig. 4 b) shows an example of the drawer 17 in the closed state, i.e. in the closed position in which the drawer is partially mounted on the drawer receptacle 19 of the weighing device 11 and partially on the at least one slide rail 18.

[0183] It is understood that the laboratory device can also comprise more than one weighing device 11 in these embodiments, wherein, for example, each of these weighing devices comprises a corresponding drawer holder 19.

[0184] With reference to Fig. 5, the present invention further relates to a method for determining the fill level of a liquid reservoir 12 in a laboratory device 1, in particular in a laboratory device as described above. The method comprises receiving at least one signal indicative of a weight of a liquid in a liquid reservoir (step 210), and determining the fill level of the liquid reservoir based on the at least one signal (step 230). Determining the fill level can comprise determining the weight of the liquid in the liquid reservoir based on the at least one signal. For example, the empty weight of the liquid reservoir 12 and / or the weight of a possible receiving device 13 can also be taken into account.The empty weight of the liquid reservoir 12 and / or the weight of the receiving device 13 can also be determined as part of the method or received, for example, as user input.

[0185] The fill level can then be determined based on the weight of the liquid. Preferably, the determination can also be based on the density of the liquid. However, the fill level can also be determined without knowledge of the density. For example, taking into account the weight of the liquid when the liquid reservoir 12 is completely filled, a relative fill level can be determined based on the current liquid weight. This relative fill level, taking into account a liquid volume when the liquid reservoir 12 is completely filled, can also allow the fill level to be determined as a volume, e.g., in liters.

[0186] By determining the fill level, fill level data can be generated, which can be stored as part of the method (step 250). Such fill level data can include information about a temporal progression of the fill level; for example, fill level data can be assigned to a point in time at which it was determined. The fill level data can also be assigned to performed processes. Process parameters can also be stored, whereby process parameters can include, for example, air humidity, process duration, temperature, and evaporator throughput. This can advantageously enable the analysis and / or comparison of performed processes with regard to liquid consumption.

[0187] In particular, the method can comprise predicting fluid consumption. In particular, the method can predict or estimate fluid consumption during a process performed by the laboratory device. The prediction can take stored fill level data into account and, for example, use statistical learning methods to draw insights from the stored fill level data and thus make predictions about future fluid consumption. In particular, the prediction can also take stored process parameters into account and, for example, identify processes in the stored fill level data that have similar process parameters to a process to be performed.

[0188] Based on the prediction of fluid consumption and the determined fill level, a user can, for example, be prompted to refill the fluid reservoir before starting a corresponding process. This prevents the fluid reservoir from running dry during the process, forcing the process to be interrupted. This can be particularly advantageous if the laboratory device is operated during times when no user is present, for example, overnight or on weekends.

[0189] Likewise, a prediction of fluid consumption can also be used to estimate when the fluid reservoir needs to be refilled, so that a user knows when refilling or replacing the fluid reservoir is likely to be necessary.

[0190] Overall, the laboratory device 1 according to the invention and / or the method according to the invention thus advantageously enable fill level detection by means of a weighing device 11 (e.g., a load cell), which offers various advantages. Firstly, the described fill level detection can be used flexibly, e.g., because the user does not require direct access to the fill level detection and both tanks and (formless or non-dimensionally stable) bags can be used as liquid reservoirs. Furthermore, no sensors need to be located directly on or in the liquid reservoir, so that contamination of the liquid and / or the sensor is advantageously avoided. This also has the advantage that leaks can be reduced, since only a single connection is necessary and the liquid reservoir is also easier to clean.In particular, due to its simple design, the liquid reservoir can be autoclavable, which greatly simplifies thorough cleaning.

[0191] One advantage of using a weighing device is the long-term stability of the level measurement. In particular, corresponding weighing devices, such as load cells, exhibit little to negligible long-term drift, thus advantageously avoiding deviations due to erroneous sensor data when determining the level.

[0192] Furthermore, the fill level of the liquid reservoir can be recorded linearly, continuously and / or digitally and shown, for example, on a display. In other words, unlike in conventional fill level indicators for corresponding laboratory devices, the data is available directly digitally and the fill level can be recorded continuously. This advantageously allows the current fill level to be shown to the user in real time. Likewise, consumption can be directly determined, visualized and saved. This means that consumption data can be collected and evaluated, for example, over a longer period of time so that consumption quantities of individual processes or applications can be measured, tracked and / or saved. This advantageously makes it possible to predict future consumption and thus predict when the liquid reservoir needs to be refilled or replaced.This can, for example, advantageously make it possible to indicate whether the liquid reservoir needs to be refilled before a process is started and carried out, for example, over the weekend.

[0193] A user can also collect consumption data and, based on this, adapt and optimize processes (or procedures / applications) carried out with the laboratory device, e.g. by means of statistical learning.

[0194] Whenever a relative term such as "approximately," "substantially," or "approximately" is used in this description or the claims, such a term should also be interpreted to include the exact term. For example, "substantially straight" should be interpreted to include "(exactly) straight."

[0195] Whenever steps have been recited in the above or even in the appended claims, it should be noted that the order in which the steps are recited in this text may be random. This means that the order in which the steps are recited may be random unless otherwise stated or it is clear to a person skilled in the art. This means that, for example, when it is stated in the present document that a method comprises steps (A) and (B), this does not necessarily mean that step (A) occurs before step (B). It is also possible that step (A) is carried out (at least partially) concurrently with step (B) or that step (B) occurs before step (A). Furthermore, when it is stated that one step (X) precedes another step (Z), this does not mean that there is no step between steps (X) and (Z).That is, step (X) before step (Z) encompasses the situation where step (X) is executed directly before step (Z), but also the situation where (X) is executed before one or more steps (Y1), ..., followed by step (Z). Similar considerations apply when using terms such as "after" or "before."

[0196] While a preferred embodiment has been described above with reference to the accompanying drawings, it will be understood by those skilled in the art that this embodiment has been provided for illustrative purposes only and should in no way be construed as limiting the scope of the present invention, which is defined by the claims.

Claims

Claims 1. A laboratory device comprising at least one weighing device and a processing unit; wherein the at least one weighing device is configured to provide a signal indicative of a weight of a liquid in a liquid reservoir; and wherein the processing unit is configured to receive the signal from the at least one weighing device.

2. Laboratory device according to the preceding claim, wherein the laboratory device further comprises a receiving device designed to receive the liquid reservoir, wherein the receiving device is connected to the at least one weighing device such that the latter can provide the signal indicative of the weight of the liquid in the liquid reservoir received by the receiving device.

3. Laboratory device according to one of the preceding claims, wherein the processing unit is designed to determine the fill level of the liquid reservoir based on the signal of the at least one weighing device.

4. Laboratory device according to the preceding claim, wherein the fill level is determined with an accuracy of up to 1%, preferably up to 0.2%, more preferably up to 0.1%.

5. Laboratory device according to one of the preceding claims, wherein the liquid reservoir is arranged inside the laboratory device.

6. Laboratory device according to one of the preceding claims, wherein a volume of the liquid reservoir is a maximum of 10 l, preferably a maximum of 7.5 l, more preferably a maximum of 5 l.

7. Laboratory device according to one of the preceding claims, wherein the laboratory device is at least one of a climate chamber, an incubator, for example a CC incubator, a heating cabinet, an incubator and / or an oven.

8. Laboratory device according to one of the preceding claims, wherein the laboratory device comprises a drawer designed to receive the liquid reservoir.

9. A method for determining the fill level of a liquid reservoir in a laboratory device, the method comprising: Receiving at least one signal indicative of a weight of a liquid in a liquid reservoir, and Determining the fill level of the liquid reservoir based on the at least one signal.

10. Method according to the preceding claim, wherein the laboratory device is a laboratory device according to one of claims 1 to 9.

11. The method according to any one of claims 9 and 10, wherein the method further comprises predicting a fluid consumption of the laboratory device.

12. The method according to the preceding claim, wherein the method further comprises requesting refilling based on the prediction of fluid consumption and the determined fill level.

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