A method for calibrating the relationship between liquid level and volume and a measuring device

Abstract

The application discloses a kind of liquid level and volume relationship calibration methods, first to the gauge inside filling calibration reagent, measure the liquid level value of reagent in gauge;After that, according to the liquid level value, the basic parameters of the structure of gauge itself and the basic parameters of the environment of the environment where gauge is located are calculated and corrected to obtain the volume of reagent in gauge;Then known volume reagent in gauge is transported to the container to be calibrated, thereby completing the calibration of the relationship between the liquid level and the volume of the container to be calibrated.The method of the application can effectively reduce the measurement error and improve the precision, improve the success rate of tank container calibration test to reduce the labor input.The application also provides a kind of liquid level and volume relationship calibration device.

Description

Technical Field

[0001] This invention specifically relates to a method and measuring device for calibrating the relationship between liquid level and volume. Background Technology

[0002] During the commissioning of nuclear chemical engineering projects, the liquid level and volume relationship of nearly a thousand storage tanks needs to be calibrated, requiring approximately several hundred person-months of manpower for calibration. Current tank calibration testing methods are relatively traditional, with traditional graduated cylinders, measuring cups, or flow meters being the primary measuring tools for measuring the volume of deionized water. To ensure calibration accuracy, when calibrating the top or bottom of vertical storage tanks, it is necessary to repeatedly measure a certain volume of liquid using graduated cylinders or measuring cups before pouring it into the tank (specifically, this requires someone to hold the graduated cylinder and pour the liquid into the tank).

[0003] The current measurement method may require multiple retakes due to inaccurate measurement data, and accidental spillage of water from the measuring cup outside the storage tank may distort the tank calibration data, resulting in unqualified data. Furthermore, human visual identification may introduce errors, and multiple readings of the volume of the measuring cup or cylinder may further increase the cumulative error. Summary of the Invention

[0004] The technical problem to be solved by this invention is to address the aforementioned shortcomings in the existing technology by providing a method for calibrating the relationship between liquid level and volume. This method can effectively reduce measurement errors and improve accuracy, thereby increasing the success rate of calibration tests for storage tanks and reducing manpower input. This invention also provides a measuring device for calibrating the relationship between liquid level and volume.

[0005] This invention provides a method for calibrating the relationship between liquid level and volume, comprising the following steps:

[0006] The measuring instrument is filled with calibration reagents to measure the liquid level of the reagents inside.

[0007] The volume of the reagent inside the measuring instrument is obtained by calculating and correcting based on the liquid level, the basic structural parameters of the measuring instrument itself, and the basic environmental parameters of the environment in which the measuring instrument is located.

[0008] A known volume of reagent from the measuring instrument is transferred to the container to be calibrated, thereby completing the calibration of the relationship between the liquid level and volume in the container to be calibrated.

[0009] Furthermore, the calculation and correction based on the liquid level, the basic structural parameters of the measuring instrument itself, and the basic environmental parameters of the environment in which the measuring instrument is located to obtain the volume of reagent inside the measuring instrument specifically includes:

[0010] The theoretical volume of the reagent inside the measuring instrument is calculated based on the liquid level and basic structural parameters.

[0011] The theoretical volume was corrected using basic environmental parameters to obtain the volume of the reagent inside the measuring instrument.

[0012] Furthermore, this method uses a container equipped with a level gauge as the measuring instrument;

[0013] The theoretical volume calculated based on the liquid level and basic structural parameters specifically includes:

[0014] The theoretical volume of the reagent inside the measuring instrument is obtained according to formula (a):

[0015] V C =V0+L*S*10 -6 (a)

[0016] Where V0 and S are both basic structural parameters, V0 is the volume below the detection end of the level gauge in the measuring instrument; S is the cross-sectional area at the corresponding level value L in the measuring instrument;

[0017] The process of correcting the theoretical volume using basic environmental parameters to obtain the volume of the reagent within the measuring instrument specifically includes:

[0018] Using formula (b) to calculate the theoretical volume V C The volume V of the reagent in the measuring instrument is obtained by making corrections. T :

[0019] V T =V C *(1+β(TT C (b)

[0020] Among them, T C T and β are both basic environmental parameters, where T C The calibration temperature is used when calibrating the measuring instrument, where T is the current operating temperature of the measuring instrument, and β is the coefficient of thermal expansion of the measuring instrument material.

[0021] Furthermore, before filling the calibration reagent into the vectoring device, the following steps are also included:

[0022] The measuring instrument is calibrated to obtain n liquid levels L1 to L2 from low to high within the instrument. n The corresponding internal cross-sectional areas of the measuring instruments S1 to S2 are respectively. n ;

[0023] Before obtaining the theoretical volume of the reagent in the measuring instrument according to formula (a), the method further includes:

[0024] The cross-sectional area S inside the measuring instrument is obtained based on the liquid level L of the reagent inside the measuring instrument, specifically including:

[0025] When the liquid level of the reagent in the measuring instrument is L = L1, then S = S1; when L = L i Then S = S i When L i <L<L i+1If i = 1 to n, then S is obtained according to formula (c):

[0026]

[0027] Furthermore, this method uses a cylinder equipped with a differential pressure level gauge as the measuring instrument.

[0028] The liquid level value of the reagent in the measuring instrument specifically includes:

[0029] The measured liquid level L of the reagent in the measuring instrument (1) was obtained by measuring the differential pressure level gauge (11). T ,

[0030] Based on the basic environmental parameters of the environment in which the measuring instrument (1) is located, formula (d) is used to determine the measured liquid level L. T The liquid level L of the reagent in the measuring instrument (1) is obtained after correction:

[0031]

[0032] Where, ρ 4w G is the density of water at 4℃. s ρ is the standard gravitational acceleration, and G is the basic environmental parameter of the environment in which the measuring instrument (1) is located. ρ is the density of the reagent in the measuring instrument (1), and G is the gravitational acceleration of the place where the measuring instrument (1) is used.

[0033] The present invention also provides a measuring device for calibrating the relationship between liquid level and volume, comprising a control system and a measuring instrument. The measuring instrument includes a cylinder and a liquid inlet tube. The cylinder is positioned above the container to be calibrated and is used to hold the calibration reagent. The bottom of the cylinder is connected to the container to be calibrated through the liquid inlet tube. A level gauge is provided inside the cylinder for measuring the liquid level value of the reagent inside the measuring instrument. The control system is electrically connected to the level gauge and is used to calculate and correct the volume of the reagent inside the measuring instrument based on the liquid level value, the basic structural parameters of the measuring instrument itself, and the basic environmental parameters of the environment in which the measuring instrument is located.

[0034] Furthermore, the bottom of the cylinder is provided with a support foot, and there are multiple support feet evenly distributed around the axis of the cylinder. The bottom of each support foot is connected to a horizontal annular plate coaxial with the cylinder. The horizontal annular plate is provided with multiple anchor bolts for connecting to the mounting plane. When the cylinder is placed on the mounting plane, the axial fastening position of each anchor bolt to the mounting plane is adjusted to keep the cylinder axis vertical.

[0035] Furthermore, the measuring instrument also includes a support plate, which is placed at the opening of the container to be calibrated and serves as a mounting plane to support the cylinder. The support plate has a through hole in the middle that allows the liquid inlet tube to pass through. Multiple strip-shaped grooves are formed on the support plate along the radial direction of the container to be calibrated. Each strip-shaped groove is equipped with a clamping block and a sliding block. The clamping block and the sliding block fit against the opening of the container to be calibrated from the inside and outside of the opening, respectively, and are fastened by fastening bolts to fix the support plate to the opening of the container to be calibrated.

[0036] Furthermore, the top of the cylinder is symmetrically provided with two lifting lugs, and a lead screw arranged radially along the cylinder is installed through the two lifting lugs. A hook is provided in the middle of the lead screw, and an adjusting nut is fitted at both ends of the lead screw where it passes through the lifting lugs for fastening the lifting lugs. When the cylinder is suspended, the axial position of each lifting lug on the lead screw is adjusted by adjusting each adjusting nut to keep the cylinder axis vertical.

[0037] Furthermore, the control system is used to obtain the theoretical volume V of the reagent in the measuring instrument according to formula (a). C :

[0038] V C =V0+L*S*10 -6 (a)

[0039] Where V0 and S are both basic structural parameters, V0 is the volume below the detection end of the level gauge in the measuring instrument; S is the cross-sectional area at the corresponding level value L in the measuring instrument;

[0040] It is also used to calculate the theoretical volume V using formula (b). C The volume V of the reagent in the measuring instrument is obtained by making corrections. T :

[0041] V T =V C *(1+β(TT C (b)

[0042] Among them, T C T and β are both basic environmental parameters, where T C The calibration temperature is used when calibrating the measuring instrument, where T is the current operating temperature of the measuring instrument, and β is the coefficient of thermal expansion of the measuring instrument material.

[0043] Furthermore, the control system is also used to obtain the corresponding cross-sectional area S inside the measuring instrument based on the calibration parameters and the liquid level L of the reagent inside the measuring instrument:

[0044] When the liquid level of the reagent in the measuring instrument is L = L1, then S = S1; when L = L i Then S = S i When L i <L<L i+1If i = 1 to n, then S is obtained according to formula (c):

[0045]

[0046] Among them, L1 to L n S1 to S n All are calibration parameters, S1 to S n The gauge contains n liquid levels L1 to L2, from low to high. n The corresponding inner cross-sectional area of ​​the measuring instrument at each location.

[0047] Furthermore, the level gauge is a differential pressure level gauge, and the control system is also used to determine the measured level L of the reagent in the gauge obtained by the differential pressure level gauge based on the basic environmental parameters of the environment in which the gauge is located, using formula (d). T After correction, the liquid level L of the reagent in the measuring instrument is obtained:

[0048]

[0049] Where, ρ 4w G is the density of water at 4℃. s ρ is the standard gravitational acceleration, and G is the basic environmental parameter of the environment in which the measuring instrument is located. ρ is the density of the reagent inside the measuring instrument, and G is the gravitational acceleration of the place where the measuring instrument is used.

[0050] Furthermore, the control system is equipped with a human-machine interface, which includes a main interface and a basic parameter interface. The main interface is used to receive and display the liquid level value measured by the level gauge and the volume value of the reagent in the measuring instrument obtained by the control system. It also has a basic parameter button, which is used to switch to the basic parameter interface after being triggered. The basic parameter interface is used to receive and display first input information, which includes the basic structural parameters of the measuring instrument itself and the basic environmental parameters of the environment in which the measuring instrument is located. It also has a return button and a reset button. The return button is used to switch to the main interface after being triggered, and the reset button is used to reset the basic structural parameters of the measuring instrument itself and the basic environmental parameters of the environment in which the measuring instrument is located to the initial settings after being triggered.

[0051] Furthermore, the human-machine interface also includes a calibration parameter interface. The basic parameter interface is further provided with a calibration parameter button. The calibration parameter button is used to switch to the calibration parameter interface after being triggered. The calibration parameter interface is used to receive and display second input information, the second input information including the aforementioned calibration parameters, and is provided with a return button. The return button is used to switch to the basic parameter interface after being triggered.

[0052] Furthermore, the control system includes a calculation module and a display screen. The display screen serves as a human-machine interface on the measuring instrument. The level gauge converts the level signal into an electrical signal and sends it to the calculation module. The calculation module is electrically connected to the display screen and is used to calculate the volume of the reagent in the measuring instrument based on the electrical signal, the basic structural parameters of the measuring instrument input through the human-machine interface, and the basic environmental parameters of the environment in which the measuring instrument is located. The calculation module then sends the liquid level value and the volume of the reagent to the display screen for display.

[0053] Furthermore, the control system is a touchscreen PLC all-in-one machine.

[0054] The liquid level and volume relationship calibration method of this invention does not rely solely on the static nominal volume of the graduated cylinder as in traditional methods. Instead, it first obtains the liquid level of the reagent, and then performs real-time calculations and corrections by combining the structural parameters of the measuring instrument and environmental parameters. It integrates the multi-dimensional physical characteristics of the measuring instrument under actual working conditions, accurately incorporating the influence of the measuring instrument's own structure and the surrounding environment on the reagent through real-time calculations, fully compensating for and correcting deviations—precisely the error sources that are completely impossible to quantify in traditional manual operations. Therefore, this method can effectively reduce measurement errors and improve accuracy, increasing the success rate of container calibration tests. Furthermore, this measurement process is highly structured and standardized, and can be fully automated, avoiding visual errors caused by reliance on human eyes and cumulative errors caused by multiple operations in traditional methods. This reduces manpower input and eliminates the risk of accidental spillage due to manual pouring, ensuring the integrity and reliability of the delivered volume. Attached Figure Description

[0055] Figure 1 This is a schematic diagram of the measuring device for calibrating the relationship between liquid level and volume in Embodiment 2 of the present invention;

[0056] Figure 2 This is a schematic diagram of the external structure of the measuring instrument used for calibrating the relationship between liquid level and volume in Embodiment 2 of the present invention;

[0057] Figure 3 This is a schematic diagram of the measuring device for calibrating the relationship between liquid level and volume placed at the opening of the container being measured in Embodiment 2 of the present invention;

[0058] Figure 4 This is a schematic diagram of the measuring device for calibrating the relationship between liquid level and volume in Embodiment 2 of the present invention placed on the ground;

[0059] Figure 5 This is a schematic diagram of the measuring device for calibrating the relationship between liquid level and volume suspended at the crossbeam in Embodiment 2 of the present invention;

[0060] Figure 6 This is a schematic diagram of the main interface of the control system of the measuring device for calibrating the relationship between liquid level and volume in Embodiment 2 of the present invention;

[0061] Figure 7 This is a schematic diagram of the basic parameter interface of the control system of the measuring device for calibrating the relationship between liquid level and volume in Embodiment 2 of the present invention;

[0062] Figure 8 This is a schematic diagram of the main interface of the measuring device used for calibrating the relationship between liquid level and volume in Embodiment 2 of the present invention after the reading is returned to zero;

[0063] Figure 9 This is a schematic diagram of the control system calibration parameter interface of the measuring device for calibrating the relationship between liquid level and volume in Embodiment 2 of the present invention;

[0064] Figure 10 This is a schematic diagram showing the distribution of calibration parameters of the measuring device used for calibrating the relationship between liquid level and volume in Embodiment 2 of the present invention.

[0065] In the diagram: 1. Measuring instrument; 11. Differential pressure level gauge; 12. Cylinder; 121. Support leg; 122. Horizontal annular plate; 123. Anchor bolt; 1231. Nut; 124. Lifting lug; 125. Lead screw; 126. Hook; 127. Adjusting nut; 128. Level; 129. Sleeve; 13. Liquid inlet pipe; 14. Support plate; 141. Through hole; 142. Strip groove; 143. Clamping block; 144. Sliding block; 145. Fastening bolt; 15. Valve; 16. Outlet pipe; 2. Container to be calibrated; 3. Touch screen PLC all-in-one machine; 4. Electrical box. Detailed Implementation

[0066] The technical solutions of the invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without creative effort are within the scope of the invention.

[0067] In the description of this invention, it should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience and simplification of the description and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0068] In the description of this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0069] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "setting," "installation," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0070] Example 1

[0071] The liquid level-volume relationship calibration method of this embodiment can be used in the field of metrology, specifically for calibration tests of storage tanks in chemical and nuclear chemical projects. The method includes the following steps:

[0072] The measuring instrument 1 is filled with calibration reagent, and the liquid level of the reagent in the measuring instrument 1 is measured.

[0073] The volume of reagent in measuring instrument 1 is obtained by calculating and correcting based on the liquid level, the basic structural parameters of measuring instrument 1 itself, and the basic environmental parameters of the environment in which measuring instrument 1 is located.

[0074] The reagent of known volume in measuring instrument 1 is transferred to the calibrated container 2, thereby completing the calibration of the relationship between liquid level and volume in the calibrated container 2.

[0075] The liquid level and volume calibration method in this embodiment does not rely solely on the static nominal volume of the graduated cylinder as in traditional methods. Instead, it first obtains the reagent level and then performs real-time calculations and corrections by combining the structural parameters of the measuring instrument with environmental parameters. It integrates the multi-dimensional physical characteristics of the measuring instrument under actual working conditions, accurately incorporating the influence of the instrument's own structure and the surrounding environment on the reagent through real-time calculations, fully compensating for and correcting deviations—precisely the error sources that are completely unquantifiable in traditional manual operations. Therefore, this method can effectively reduce measurement errors and improve accuracy, increasing the success rate of container calibration tests. Furthermore, this measurement process is highly structured and standardized, and can be fully automated, avoiding visual errors caused by human eyes and cumulative errors caused by multiple operations in traditional methods. This reduces manpower input and eliminates the risk of accidental spillage due to manual pouring, ensuring the integrity and reliability of the delivered volume. The method in this embodiment can use the device in Embodiment 2, and the parameters can be input using the PLC integrated machine 3 in the device.

[0076] The method described in this embodiment can effectively reduce the workload of the person in charge of the tank calibration test, reduce the manpower required for debugging, reduce errors, and improve the success rate of the tank calibration test. At the same time, it can reduce the total commissioning period of various chemical projects.

[0077] In this embodiment, the volume of reagent inside the measuring vessel 1 is obtained by calculation and correction based on the liquid level, the basic structural parameters of the measuring vessel 1 itself, and the basic environmental parameters of the environment in which the measuring vessel 1 is located. Specifically, this includes:

[0078] The theoretical volume of the reagent in gauge 1 is calculated based on the liquid level and basic structural parameters.

[0079] The theoretical volume was corrected using basic environmental parameters to obtain the volume of the reagent in measuring vessel 1.

[0080] Among them, the liquid level value itself is a direct physical quantity with original traceability. It can be directly captured by various sensors and other components. Its measurement itself is not directly affected by the geometric deformation of the container. Therefore, this "observe first and then correct" architecture essentially upgrades the volume calculation from passive reading of the fixed container scale to active deduction, so that the final volume value becomes a solution verified by environmental and structural variables. Moreover, there are no manual intervention nodes in the process, which fundamentally eliminates visual misjudgment and operational errors, and makes the calibration data have repeatable and verifiable reliability.

[0081] In this embodiment, a container equipped with a level gauge is used as measuring instrument 1 during measurement;

[0082] The theoretical volume calculated above based on the liquid level and basic structural parameters specifically includes:

[0083] The theoretical volume V of the reagent in measuring instrument 1 is obtained according to formula (a). C :

[0084] V C =V0+L*S*10 -6 (a)

[0085] Wherein, V0 and S are both basic structural parameters. V0 is the volume below the detection end of the level gauge in measuring instrument 1, specifically the volume below the pressure tap of the differential pressure level gauge 11, or the liquid volume, in units of L (liters). It is a determined value obtained through level gauge position calculation or manually input. S is the cross-sectional area of ​​the measuring instrument 1 at the corresponding liquid level value L, in units of mm. 2 (This is a value adjusted by ten points based on the liquid level reading); L is in mm; V C The unit is L (liter).

[0086] The theoretical volume was corrected using basic environmental parameters to obtain the volume of the reagent in measuring vessel 1, specifically including:

[0087] Using formula (b) to calculate the theoretical volume V C The volume V of the reagent in measuring instrument 1 is obtained by correction. T :

[0088] V T =VC *(1+β(TT C (b)

[0089] Among them, T C T and β are both basic environmental parameters, T C The calibration temperature for calibrating gauge 1, in °C, can be manually entered; T is the current operating temperature of gauge 1, in °C, which can also be manually entered; β is the coefficient of thermal expansion of gauge 1. Gauge 1 can be made of 304 stainless steel, so its β value is 50*10. -6 The unit is 1 / ℃, and it can be manually entered. V T The unit is L (liter).

[0090] Ideally, measuring tool 1 has a regular cross-sectional shape. However, due to factors such as machining accuracy, transportation, installation, and daily wear, the surface may become uneven, leading to deviations in the cross-sectional area at various heights. Therefore, in this embodiment, before filling the measuring tool 1 with calibration reagents, the following steps are also included:

[0091] Calibrate gauge 1 and obtain n liquid levels L1 to L2 from low to high within gauge 1. n The corresponding internal cross-sectional areas of measuring instrument 1 at each location are S1 to S2. n S1 to S n The unit is mm 2 Values ​​can be manually entered, L1 to L n The unit is mm, and the value can be manually input; in this embodiment, L1 is the position of the detection end (bottom) of the level gauge, and the position of the measuring instrument 1 above this point is a straight section;

[0092] Before obtaining the theoretical volume of the reagent in gauge 1 according to formula (a), the method further includes:

[0093] The cross-sectional area S within measuring instrument 1 is obtained based on the liquid level L of the reagent inside measuring instrument 1, specifically including the following ten correction steps:

[0094] When the liquid level of the reagent in measuring instrument 1 is L = L1, then S = S1; when L = L i Then S = S i When L i <L<L i+1 If i = 1 to n, then S is obtained according to formula (c):

[0095]

[0096] That is, in each selected L i At this location, its cross-sectional area S iThere is a deviation, so corrections are made to ensure measurement accuracy. Several heights and their corresponding areas are determined. This area is the cross-sectional area corresponding to the liquid volume when filled to a certain level, obtained from external calibration equipment. Therefore, this area can be considered the equivalent cross-sectional area. Figure 10 As shown, these data are used to correct the corresponding area of ​​the measured height, reducing the impact of surface deformation on the measuring instrument. The measuring instrument 1 can be calibrated periodically during use.

[0097] In this embodiment, a cylinder 12 equipped with a differential pressure level gauge 11 is used as a measuring instrument 1 to measure the liquid level of the reagent inside the measuring instrument 1, specifically including:

[0098] The measured liquid level L of the reagent in the measuring vessel 1 was obtained by measuring the differential pressure level gauge 11. T ,

[0099] Based on the basic environmental parameters of the environment where measuring instrument 1 is located, formula (d) is used to determine the measured liquid level L. T After correction, the liquid level value L of the reagent in measuring instrument 1 is obtained:

[0100]

[0101] Where, ρ 4w The density of water at 4℃ is 999.9720 kg / m³. 3 , is a definite input value; G s The standard gravitational acceleration is 9.80665 m / s². 2 , is the input value; ρ and G are both basic environmental parameters of the environment in which measuring instrument 1 is located, and ρ is the density of the reagent in measuring instrument 1, in kg / m³. 3 It can be input manually; G is the gravitational acceleration at the location where gauge 1 is used, in m / s². 2 This can be entered manually. L T The unit is mm.

[0102] In general, the method in this embodiment is as follows: first, the measuring instrument 1 is calibrated, and n liquid levels L1 to L2 in the measuring instrument 1 are obtained from low to high. n The equivalent cross-sectional areas S1 to S2 within the corresponding measuring instruments 1 are respectively n .

[0103] Next, measuring instrument 1 is set up, calibration reagent is filled into measuring instrument 1, and the measured liquid level L of the reagent in measuring instrument 1 is obtained. T Formula (d) is used to calculate the measured liquid level L. TThe liquid level L of the reagent in measuring vessel 1 is obtained after correction. During this process, a differential pressure level gauge 11 is used for measurement, thus enabling non-contact measurement. This method can be used in chemical projects to determine the level of deionized water reagent in calibrating storage tanks. The unit of the output signal of the differential pressure level gauge 11 is millimeters of water column (mmWC), which is the value at 4℃ under standard gravitational acceleration (when water density is at its maximum, approximately 999.9720 kg / m³). 3 The pressure generated by a 1 mm high water column at a given time, after conversion, yields the measured liquid level L. T The standard gravitational acceleration is 9.80665 m / s². Therefore, correcting this value using basic environmental parameters can further improve measurement accuracy, ensuring accurate liquid level values ​​even in non-contact measurement scenarios under real-world conditions.

[0104] After obtaining the accurate liquid level value, it can be determined according to L1 to L... n S1 to S n This series of calibration parameters yields the accurate equivalent cross section S corresponding to the liquid level value L, thereby allowing the calculation of the theoretical volume V of the reagent. C .

[0105] Since the temperature during calibration of gauge 1 may differ from the actual ambient temperature, the theoretical volume V is adjusted based on the material expansion coefficient of gauge 1. C The volume V of the reagent in measuring instrument 1 is obtained by correction. T This completely eliminates the influence of the environment on the measured volume.

[0106] In this way, the precise reagent volume can be obtained, thus enabling more accurate results when the reagent is transported to the calibration container 2 to calibrate the liquid level and volume relationship of the calibration container 2.

[0107] Example 2

[0108] The measuring device for calibrating the liquid level and volume relationship in this embodiment can be used in the method of Embodiment 1, and can be described as an intelligent measuring instrument device for calibrating the liquid level and volume relationship of a container. Figure 1 As shown, the device includes a control system and a measuring instrument 1. The measuring instrument 1 includes a cylinder 12 and a liquid inlet tube 13. The cylinder 12 is positioned above the container 2 to be calibrated and is used to hold the calibration reagent. The bottom of the cylinder 12 is connected to the container 2 to be calibrated through the liquid inlet tube 13. A level gauge is installed inside the cylinder 12 to measure the liquid level of the reagent in the measuring instrument 1. The control system is electrically connected to the level gauge and is used to calculate and correct the volume of the reagent in the measuring instrument 1 based on the liquid level, the basic structural parameters of the measuring instrument 1 itself, and the basic environmental parameters of the environment in which the measuring instrument 1 is located.

[0109] Similarly, because this device first obtains the reagent level and then combines the instrument's structural parameters and environmental parameters for real-time calculation and correction, it can fully compensate for correction deviations—precisely the error sources that are completely unquantifiable in traditional manual operations. Therefore, this device can effectively reduce measurement errors and improve accuracy, increasing the success rate of container calibration tests. Furthermore, the process can be fully automated, avoiding visual errors caused by reliance on human eyes and cumulative errors from multiple operations, reducing manpower input, and eliminating the risk of accidental spillage due to manual pouring, ensuring the integrity and reliability of the delivered volume.

[0110] The apparatus of this embodiment can be customized to produce measuring instruments 1 of different shapes and sizes based on the volume and arrangement of the storage tank (container 2 to be calibrated) on site. Since deionized water is generally used for tank calibration, 304 stainless steel is considered for manufacturing the measuring instrument 1. In special cases where other reagents are required for calibration, the measuring instrument 1 can also be made of other appropriate materials. In this embodiment, the cylindrical body 12 of the measuring instrument 1 is a circular cross-section cylinder with a diameter of 260 mm and a height of 380 mm. The bottom of the cylindrical body 12 is conical with a 5-degree taper. A straight pipe with an inner diameter of 10 mm is installed at the lowest point, and a manual valve 15 is installed 10 mm from the top of the straight pipe to control the storage or release of water in the measuring instrument 1. A straight pipe section 16 is installed downstream of the valve 15 as an outlet pipe.

[0111] In this embodiment, to ensure the reliability of the liquid level value, the cylinder 12 is arranged in a vertical shape, and a level 128 can be installed on the cylinder 12 to observe whether the shape of the cylinder 12 meets the requirements.

[0112] In this embodiment, the bottom of the cylinder 12 is provided with a support leg 121. Multiple support legs 121 are provided and are evenly distributed around the axis of the cylinder 12. The bottom of each support leg 121 is connected to a horizontal annular plate 122 coaxial with the cylinder 12. Multiple anchor bolts 123 are provided on the horizontal annular plate 122 and are connected to the mounting plane in the vertical direction. They are used to adjust the height to ensure that the measuring tool 1 is horizontal. When the cylinder 12 is placed on the mounting plane, the axial fastening position of each anchor bolt 123 to the mounting plane is adjusted to keep the axis of the cylinder 12 vertical.

[0113] In this embodiment, the measuring instrument 1 also includes a support plate 14, which is placed at the opening of the container 2 to be calibrated and serves as a mounting plane to support the cylinder 12. The middle part of the support plate 14 is provided with a through hole 141 that allows the liquid inlet tube 13 to pass through. Multiple strip grooves 142 are provided on the support plate 14 along the radial direction of the container 2 to be calibrated. Each strip groove 142 is provided with a clamping block 143 and a slider 144. The clamping block 143 and the slider 144 fit against the opening of the container 2 to be calibrated from the inside and outside of the opening, respectively, that is, clamp the edge of the opening, and are fastened by fastening bolts 145 to fix the support plate 14 to the opening of the container 2 to be calibrated.

[0114] Therefore, when placing the measuring tool 1, it can be placed on the platform above the storage tank or directly installed at the opening of the storage tank via the support plate 14, depending on the space requirements.

[0115] In this embodiment, two lifting lugs 124 are symmetrically provided on the top of the cylinder 12. A lead screw 125 arranged radially along the cylinder 12 is provided through the two lifting lugs 124. A hook 126 is provided in the middle of the lead screw 125. The hook 126 can be connected to the lead screw 125 by sleeve 129. Adjusting nuts 127 are provided at the two ends of the lead screw 125 where it passes through the lifting lugs 124, for fastening the lifting lugs 124. When the cylinder 12 is suspended, the axial position of each lifting lug 124 on the lead screw 125 is adjusted by adjusting each adjusting nut 127, so as to keep the axis of the cylinder 12 vertical.

[0116] It is evident that when there is no manhole in the storage tank or space constraints prevent the measuring instrument 1 from being fixed to the support plate 14, the adjustable bracket hook 126 on the upper part of the measuring instrument 1 can be used to keep the entire equipment in a horizontal state (the axis remains vertical). Its function is to prevent the overall eccentricity of the equipment by aligning the lead screw 125 and the two lifting lugs 124 on the axis of symmetry of the equipment, and to ensure that the center of gravity and the position of the lifting point of the equipment are vertical by adjusting the adjusting nuts 127 on both sides of the sleeve 129, so that the equipment will not shift as the internal liquid level decreases.

[0117] The specific usage method is as follows:

[0118] ①Measuring tool 1 is placed on the ground for use.

[0119] like Figure 4 As shown, when there is insufficient space above the storage tank to place the measuring instrument 1, the measuring instrument 1 is placed on the ground; using the anchor bolt 123 and the nut 1231 thereon, the measuring instrument 1 is adjusted to a horizontal state, that is, the bubble of the level 128 is adjusted to the center.

[0120] ②Measuring tool 1 is placed at the opening of the container being measured and used.

[0121] like Figure 3As shown, place the measuring instrument support plate 14 on the manhole of the container to be tested; use the clamp 143, slider 144, fastening bolt 145 and nut to fix the measuring instrument support plate 14 on the container opening; place the measuring instrument 1 on the support plate 14; use the anchor bolt 123 and nut 1231 to adjust the measuring instrument 1 to a horizontal state, that is, adjust the bubble of the level 128 to the center.

[0122] ③ The measuring instrument is used while suspended from the crossbeam.

[0123] like Figure 5 As shown, when the two storage tanks are arranged vertically, the lower storage tank can be calibrated by suspending the measuring instrument 1 on the crossbeam using hook 126. For safety, hook 126 can be fastened to the crossbeam with bolts. Using sleeve 129, adjust the position of hook 126 on lead screw 125 to adjust the measuring instrument 1 to a horizontal state, that is, adjust the bubble of level 128 to the center. As the water storage of measuring instrument 1 changes, measuring instrument 1 will tilt towards electrical box 4, and the position of hook 126 on lead screw 125 needs to be readjusted to restore measuring instrument 1 to a horizontal state.

[0124] In this embodiment, the control system can obtain the volume V corresponding to the liquid level value L in the gauge according to the principle of the formula V=f(L)+V1+V2, where f(L) can represent the formula for calculating the volume-liquid level in the cylindrical part of the cylinder 12; V1 represents the volume of the lower conical part of the cylinder 12; and V2 represents the volume of the straight pipe between the lower part of the conical part and the manual valve 15.

[0125] Combining the aforementioned parameters, such as Figure 2 As shown, the control system is specifically used to obtain the theoretical volume V of the reagent in measuring instrument 1 according to formula (a). C :

[0126] V C =V0+L*S*10 -6 (a)

[0127] Wherein, V0 and S are both basic structural parameters, V0 is the volume below the detection end of the liquid level gauge in gauge 1 (V0 can be V1+V2); S is the cross-sectional area at the corresponding liquid level value L in gauge 1.

[0128] It is also used to calculate the theoretical volume V using formula (b). C The volume V of the reagent in measuring instrument 1 is obtained by correction. T :

[0129] V T =V C *(1+β(TT C (b)

[0130] Among them, T CT and β are both basic environmental parameters, T C The calibration temperature is used when calibrating gauge 1, T is the current operating temperature of gauge 1, and β is the coefficient of thermal expansion of the material of gauge 1.

[0131] In this embodiment, the control system is also used to obtain the corresponding cross-sectional area S inside the measuring instrument 1 based on the calibration parameters and the liquid level value of the reagent inside the measuring instrument 1:

[0132] When the liquid level of the reagent in measuring instrument 1 is L = L1, then S = S1; when L = L i Then S = S i When L i <L<L i+1 If i = 1 to n, then S is obtained according to formula (c):

[0133]

[0134] Among them, L1 to L n S1 to S n All are calibration parameters, S1 to S n For measuring instrument 1, there are n liquid levels L1 to L2 from low to high. n The corresponding cross-sectional area of ​​gauge 1 at each location is as follows: Figure 10 As shown.

[0135] In this embodiment, the level gauge is a differential pressure level gauge 11. The control system is also used to determine the measured liquid level L of the reagent in the measuring instrument 1 obtained by the differential pressure level gauge 11 based on the basic environmental parameters of the environment in which the measuring instrument 1 is located, using formula (d). T After correction, the liquid level L of the reagent in measuring instrument 1 is obtained:

[0136]

[0137] Where, ρ 4w G is the density of water at 4℃. s ρ is the standard gravitational acceleration, and G are the basic environmental parameters of the environment in which measuring instrument 1 is located. ρ is the density of the reagent in measuring instrument 1, and G is the gravitational acceleration of the place where measuring instrument 1 is used.

[0138] In this embodiment, the control system is provided with a human-machine interface, which includes a main interface and a basic parameter interface. The main interface is as follows: Figure 6 As shown, it is used to receive and display the liquid level value measured by the liquid level gauge and the volume value of the reagent in measuring instrument 1 obtained by the control system. It is also equipped with a basic parameter button, which is located in the lower right corner. It is used to switch to the basic parameter interface after being triggered. After the system is powered on, the main interface is displayed, which simultaneously displays the liquid level height and water storage volume (i.e., reagent volume) in the container.

[0139] Basic parameter interface as follows Figure 7 As shown, it is used to receive and display the first input information. The first input information includes the basic structural parameters of the measuring tool 1 itself and the basic environmental parameters of the environment in which the measuring tool 1 is located. It is equipped with a return button and a reset button. The return button is used to switch to the main interface after being triggered, and the reset button is used to reset the basic structural parameters of the measuring tool 1 itself and the basic environmental parameters of the environment in which the measuring tool 1 is located to the initial setting parameters after being triggered.

[0140] In the basic parameters interface, you can input the medium density, medium temperature (by default, the temperature of the gauge 1 wall is the same as the medium temperature), and gravitational acceleration at the location of use, based on the actual conditions of the gauge system. These parameters are used in the software to correct for measurement errors caused by differences in the medium density, temperature, and gravitational acceleration during gauge 1's use compared to the parameters used during gauge calibration, thus improving the accuracy of medium volume measurement. In the basic parameters interface, you can also set the "sensor upper limit" and "sensor lower limit" according to the actual range of the differential pressure transmitter (level gauge) used in gauge 1. You can also set buttons for zeroing the reading and canceling zeroing. It is recommended to zero the level gauge reading using the "zero reading" button in the basic parameters interface after gauge 1 is installed and leveled. After zeroing, the level value displayed on the main interface will also be zero. Figure 8 As shown. The volume displayed at this time is the volume of the conical bottom of gauge 1 and the connecting section of valve 15 below the differential pressure transmitter's pressure tap. If you want to display the level gauge reading when the liquid has not reached the pressure tap position after gauge 1 has been leveled, you can click the "Cancel Zeroing" button.

[0141] Click the back button in the lower right corner of the basic parameters interface to return the software to the main interface. Click the reset button in the lower left corner of the basic parameters interface to restore the initial settings of the measuring instrument system. Click the calibration parameters button in the lower middle of the basic parameters interface to enter the calibration parameters interface.

[0142] In this embodiment, the human-machine interface also includes a calibration parameter interface, such as... Figure 9As shown, the basic parameter interface also includes a calibration parameter button. This button, when triggered, switches to the calibration parameter interface, which receives and displays the second input information, including the aforementioned calibration parameters. A "return" button is also included, allowing the user to switch back to the basic parameter interface upon triggering. The calibration parameter interface allows input of ten calibration liquid level points and their corresponding ten cross-sectional areas of gauge 1. These parameters will be used in the software to perform ten-point nonlinear corrections on the cross-sectional areas of gauge 1, improving the volumetric measurement accuracy of gauge 1. The interface also allows input of the medium temperature during gauge 1 calibration. This parameter is used in the software to correct for measurement errors caused by thermal expansion and contraction of gauge 1 due to temperature changes during use. The calibration parameter interface allows input of the volume value below the pressure tap of the level gauge. This parameter is used in the software to calculate the total water storage capacity within gauge 1, including the volume below the pressure tap. Clicking the "return" button in the lower right corner of the calibration parameter interface returns the software to the basic parameter interface.

[0143] In this embodiment, the control system includes a calculation module and a display screen. The display screen serves as a human-machine interface and is mounted on the measuring instrument 1. The level gauge converts the level signal into an electrical signal and sends it to the calculation module. The calculation module is electrically connected to the display screen and is used to calculate the volume of the reagent in the measuring instrument 1 based on the electrical signal, the basic structural parameters of the measuring instrument 1 input through the human-machine interface, and the basic environmental parameters of the environment in which the measuring instrument 1 is located. The calculation module then sends the liquid level value and the volume of the reagent to the display screen for display.

[0144] In this embodiment, the level gauge first converts the level measurement signal or differential pressure signal into a voltage or current signal and inputs it into the calculation module of the control system to calculate the level value of gauge 1. Using the calculation module, the liquid volume corresponding to the level can be automatically calculated through the calculation formula. The level and volume values ​​can be displayed on the display screen of the control system for the test supervisor to read directly. The specific calculation process of the control system is described in the overall method process in Embodiment 1. The correction coefficient of the calculation module can be changed after authorization.

[0145] In this embodiment, the control system is a touchscreen PLC integrated machine 3, which allows the measuring instrument 1 to easily modify the formula parameters for calculating volume based on liquid level during actual use, improving the measurement accuracy and ease of use of the measuring instrument 1. A power switch can be added to power the touchscreen PLC integrated machine 3, and an electrical box 4, or electrical junction box, can be added to the power switch and the touchscreen PLC integrated machine 3. The program of the touchscreen PLC integrated machine 3 includes signal acquisition, data processing, liquid level calculation, volume calculation, and data display. The touchscreen PLC integrated machine 3 can be made of impact-resistant, waterproof, and dustproof materials.

[0146] In general, the device of this embodiment has the following beneficial effects:

[0147] (1) Highly practical

[0148] This measuring tool 1 can be applied to the calibration tests of storage tanks in all industries, including chemical, petroleum, pharmaceutical, bioengineering, food and beverage, including nuclear chemical engineering projects, which can greatly reduce the workload of the test supervisor.

[0149] (2) Intelligent

[0150] The measuring instrument 1 can automatically calculate the corresponding volume based on the measured liquid level, and can store and selectively accumulate the volume data, thereby automatically calculating the cumulative liquid volume required for tank calibration.

[0151] (3) Easy to operate

[0152] The measuring instrument 1 system can always be kept horizontal by adjusting the special bracket. During the calibration of the storage tank, it is only necessary to fill the measuring instrument 1 with water or drain the water by opening and closing valve 15, which is very convenient to operate.

[0153] (4) High accuracy

[0154] The system calculation module of this measuring instrument is equipped with a correction coefficient, and the high accuracy of the measuring instrument can be ensured by regular verification by a calibration agency.

[0155] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A method for calibrating the relationship between liquid level and volume, characterized in that, Includes the following steps: The measuring instrument (1) is filled with calibration reagents, and the liquid level of the reagents in the measuring instrument (1) is measured. The volume of the reagent inside the measuring instrument (1) is obtained by calculating and correcting the liquid level value, the basic structural parameters of the measuring instrument (1) itself and the basic environmental parameters of the environment in which the measuring instrument (1) is located. The reagent of known volume in the measuring instrument (1) is transferred to the container to be calibrated (2), thereby completing the calibration of the relationship between the liquid level and volume in the container to be calibrated (2).

2. The method for calibrating the relationship between liquid level and volume according to claim 1, characterized in that, The calculation and correction based on the liquid level, the basic structural parameters of the measuring instrument (1), and the basic environmental parameters of the environment in which the measuring instrument (1) is located, to obtain the volume of the reagent inside the measuring instrument (1), specifically includes: The theoretical volume of the reagent inside the measuring instrument (1) is calculated based on the liquid level and basic structural parameters. The theoretical volume was corrected using basic environmental parameters to obtain the volume of the reagent in measuring instrument (1).

3. The method for calibrating the relationship between liquid level and volume according to claim 2, characterized in that, A container with a level gauge is used as the measuring instrument (1); The theoretical volume calculated based on the liquid level and basic structural parameters specifically includes: The theoretical volume V of the reagent in the measuring instrument (1) is obtained according to formula (a). C : V C =V0+L*S*10 -6 (a) Wherein, V0 and S are both basic structural parameters, V0 is the volume below the detection end of the level gauge in the measuring instrument (1); S is the cross-sectional area at the corresponding level value L in the measuring instrument (1); The method of correcting the theoretical volume using basic environmental parameters to obtain the volume of the reagent in the measuring instrument (1) specifically includes: Using formula (b) to calculate the theoretical volume V C The volume V of the reagent in the measuring instrument (1) is obtained by correction. T : V T =V C *(1+β(T-T C )) (b) Among them, T C T and β are both basic environmental parameters, T C The calibration temperature for calibrating gauge (1) is T, the current operating temperature of gauge (1) is β, and the coefficient of thermal expansion of the material of gauge (1) is β.

4. The method for calibrating the relationship between liquid level and volume according to claim 3, characterized in that, Before filling the calibration reagent into the vector device (1), the following steps are also included: The measuring instrument (1) is calibrated to obtain n liquid levels L1 to L2 from low to high within the measuring instrument (1). n The corresponding measuring instruments (1) have internal cross-sectional areas S1 to S2 respectively. n ; Before obtaining the theoretical volume of the reagent in the measuring instrument (1) according to formula (a), the method further includes: The cross-sectional area S inside the measuring instrument (1) is obtained based on the liquid level L of the reagent inside the measuring instrument (1), specifically including: When the liquid level of the reagent in the measuring instrument (1) is L = L1, then S = S1; when L = L i Then S = S i When L i <L<L i+1 If i = 1 to n, then S is obtained according to formula (c):

5. The method for calibrating the relationship between liquid level and volume according to claim 1, characterized in that, A cylinder (12) with a differential pressure level gauge (11) is used as the measuring instrument (1). The liquid level value of the reagent in the measuring instrument (1) specifically includes: The measured liquid level L of the reagent in the measuring instrument (1) was obtained by measuring the differential pressure level gauge (11). T , Based on the basic environmental parameters of the environment in which the measuring instrument (1) is located, formula (d) is used to determine the measured liquid level L. T The liquid level L of the reagent in the measuring instrument (1) is obtained after correction: Where, ρ 4w G is the density of water at 4℃. s ρ is the standard gravitational acceleration, and G is the basic environmental parameter of the environment in which the measuring instrument (1) is located. ρ is the density of the reagent in the measuring instrument (1), and G is the gravitational acceleration of the place where the measuring instrument (1) is used.

6. A measuring device for calibrating the relationship between liquid level and volume, characterized in that, Including control systems and measuring instruments (1), The measuring instrument (1) includes a cylinder (12) and a liquid inlet tube (13). The cylinder (12) is positioned above the container (2) to be calibrated and is used to hold the calibration reagent. The bottom is connected to the container (2) to be calibrated through the liquid inlet tube (13). A liquid level gauge is provided inside the cylinder (12) to measure the liquid level of the reagent in the measuring instrument (1). The control system is electrically connected to the level gauge and is used to calculate and correct the volume of the reagent in the level gauge (1) based on the level value, the basic structural parameters of the gauge (1) itself and the basic environmental parameters of the environment in which the gauge (1) is located.

7. The measuring device for calibrating the relationship between liquid level and volume according to claim 6, characterized in that: The bottom of the cylinder (12) is provided with a support leg (121). Multiple support legs (121) are provided, evenly distributed around the axis of the cylinder (12), and the bottom of each support leg (121) is connected to a horizontal annular plate (122) coaxial with the cylinder (12). The horizontal annular plate (122) is provided with multiple anchor bolts (123) for connecting the mounting plane. When the cylinder (12) is placed on the mounting plane, the axial fastening position of each anchor bolt (123) and the mounting plane is adjusted to keep the axis of the cylinder (12) vertical.

8. The measuring device for calibrating the relationship between liquid level and volume according to claim 7, characterized in that: The measuring tool (1) also includes a support plate (14), which is placed at the opening of the container (2) to be calibrated, serving as a mounting plane to support the cylinder (12). The support plate (14) has a through hole (141) in the middle to allow the liquid inlet tube (13) to pass through, and multiple strip grooves (142) are formed on the support plate (14) along the radial direction of the container (2) to be calibrated. Each of the strip grooves (142) is provided with a clamping block (143) and a slider (144). The clamping block (143) and the slider (144) are respectively attached to the opening of the container to be calibrated (2) from the inside and outside of the opening, and are fastened by fastening bolts (145) to fix the support plate (14) to the opening of the container to be calibrated (2).

9. The measuring device for calibrating the relationship between liquid level and volume according to claim 6, characterized in that: The top of the cylinder (12) is symmetrically provided with two lifting lugs (124), and a lead screw (125) arranged radially along the cylinder (12) is installed through the two lifting lugs (124). The lead screw (125) is provided with a hook (126) in the middle. The lead screw (125) is fitted with adjusting nuts (127) at the positions where the lifting lugs (124) pass through both ends, for fastening the lifting lugs (124). When the cylinder (12) is suspended, the axial position of each lifting lug (124) on the lead screw (125) is adjusted by adjusting each adjusting nut (127) to keep the axis of the cylinder (12) vertical.

10. The measuring device for calibrating the relationship between liquid level and volume according to claim 6, characterized in that: The control system is used to obtain the theoretical volume V of the reagent in the measuring instrument (1) according to formula (a). C : V C =V0+L*S*10 -6 (a) Wherein, V0 and S are both basic structural parameters, V0 is the volume below the detection end of the level gauge in the measuring instrument (1); S is the cross-sectional area at the corresponding level value L in the measuring instrument (1); It is also used to calculate the theoretical volume V using formula (b). C The volume V of the reagent in the measuring instrument (1) is obtained by correction. T : V T =V C *(1+β(T-T C )) (b) Among them, T C T and β are both basic environmental parameters, where T C The calibration temperature for calibrating gauge (1) is T, the current operating temperature of gauge (1) is β, and the coefficient of thermal expansion of the material of gauge (1) is β.

11. The measuring device for calibrating the relationship between liquid level and volume according to claim 7, characterized in that: The control system is also used to obtain the corresponding cross-sectional area S inside the measuring instrument (1) based on the calibration parameters and the liquid level L of the reagent inside the measuring instrument (1): When the liquid level of the reagent in the measuring instrument (1) is L = L1, then S = S1; when L = L i Then S = S i When L i <L<L i+1 If i = 1 to n, then S is obtained according to formula (c): Among them, L1 to L n S1 to S n All are calibration parameters, S1 to S n For the n liquid levels L1 to L in the measuring instrument (1) from low to high n The corresponding measuring instruments (1) have the following cross-sectional areas.

12. The measuring device for calibrating the relationship between liquid level and volume according to claim 7, characterized in that: The level gauge is a differential pressure level gauge (11). The control system is also used to determine the measured liquid level L of the reagent in the measuring instrument (1) obtained by the differential pressure level gauge (11) based on the basic environmental parameters of the environment in which the measuring instrument (1) is located, using formula (d). T After correction, the liquid level L of the reagent in the measuring instrument (1) is obtained: Where, ρ 4w G is the density of water at 4℃. s ρ is the standard gravitational acceleration, and G is the basic environmental parameter of the environment in which the measuring instrument (1) is located. ρ is the density of the reagent in the measuring instrument (1), and G is the gravitational acceleration of the place where the measuring instrument (1) is used.

13. The measuring device for calibrating the relationship between liquid level and volume according to any one of claims 6 to 12, characterized in that: The control system is equipped with a human-machine interface, which includes a main interface and a basic parameter interface. The main interface is used to receive and display the liquid level value measured by the level gauge and the volume value of the reagent in the measuring instrument (1) obtained by the control system. It also has a basic parameter button, which is used to switch to the basic parameter interface after being triggered. The basic parameter interface is used to receive and display the first input information. The first input information includes the basic structural parameters of the measuring instrument (1) itself and the basic environmental parameters of the environment in which the measuring instrument (1) is located. It is equipped with a return button and a reset button. The return button is used to switch to the main interface after being triggered. The reset button is used to reset the basic structural parameters of the measuring instrument (1) itself and the basic environmental parameters of the environment in which the measuring instrument (1) is located to the initial setting parameters after being triggered.

14. The measuring device for calibrating the relationship between liquid level and volume according to claim 13, characterized in that: The human-machine interface also includes a calibration parameter interface. The basic parameter interface also includes a calibration parameter button, which is used to switch to the calibration parameter interface when triggered. The calibration parameter interface is used to receive and display the second input information, which includes the calibration parameters as described in claim 11, and is provided with a return button, which is used to switch to the basic parameter interface after being triggered.

15. The measuring device for calibrating the relationship between liquid level and volume according to claim 13, characterized in that: The control system includes a computing module and a display screen. The display screen is set on the measuring instrument (1) as a human-machine interface. The level gauge is used to convert the level signal into an electrical signal and send it to the computing module. The calculation module is electrically connected to the display screen and is used to calculate the volume of the reagent in the measuring instrument (1) based on the electrical signal, the basic structural parameters of the measuring instrument (1) input by the human-machine interface, and the basic environmental parameters of the environment in which the measuring instrument (1) is located. The liquid level value and the volume of the reagent are then sent to the display screen for display.

16. The measuring device for calibrating the relationship between liquid level and volume according to claim 15, characterized in that: The control system is a touch screen PLC all-in-one machine (3).

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