Liquid level measuring device calibration system based on temperature sensor

Abstract

The utility model discloses a liquid level measuring device calibration system based on a temperature sensor. The liquid level measuring device calibration system comprises two temperature generators, a standard temperature measuring device and a test heat preservation frame. Wherein one surface of the test heat preservation frame is heat insulation transparent glass; a through hole, a standard temperature measuring device fixing hole, a fixing screw and a fixing track are arranged on the test heat preservation frame; wherein the through hole is used for a measured liquid level measuring device to pass through; the standard temperature measuring device fixing hole and the fixing screw are used for penetrating through the standard temperature measuring device and fixing the standard temperature measuring device; the fixed track is used for adjusting the position of the measured liquid level measuring device; the temperature generator is arranged in the test heat preservation frame and comprises a liquid temperature circulation generation device and a solid temperature generation device; and the standard temperature measuring device is used for providing a temperature standard value.

Description

Technical Field

[0001] This utility model belongs to the field of liquid level measurement technology based on temperature sensors, and relates to a calibration system for a liquid level measurement device based on a temperature sensor. Background Technology

[0002] Liquid level measurement plays a crucial role in many technological fields, and its function and importance are reflected in the following aspects:

[0003] 1. Safety Monitoring: In many industrial and application scenarios, abnormal increases or decreases in liquid levels can pose safety hazards. For example, in chemical storage tanks, excessively high liquid levels may cause spills, leading to environmental pollution or fire risks; while excessively low liquid levels may affect the stability of the production process. Therefore, liquid level measurement allows for real-time monitoring of liquid level changes, enabling the timely detection and handling of potential safety hazards.

[0004] 2. Process Control: Liquid level is one of the important indicators for measuring whether the production process is operating normally. In automated production lines, liquid level measurement systems can provide real-time data to help operators accurately control the amount of raw materials added, the amount of products output, etc., thereby ensuring the continuity and stability of the production process.

[0005] 3. Resource Optimization: Through precise liquid level measurement, businesses can manage their storage and transportation resources more effectively. For example, in the logistics industry, understanding the liquid level of goods helps optimize loading and unloading processes, reducing space waste and transportation costs.

[0006] 4. Environmental Protection: Liquid level measurement also plays an important role in environmental protection. For example, in wastewater treatment facilities, monitoring the liquid level in wastewater tanks can ensure that wastewater is treated in a timely and effective manner, preventing wastewater overflow and pollution of the natural environment.

[0007] 5. Decision Support: Liquid level data can also provide strong support for enterprises' strategic decision-making. By analyzing historical liquid level data, enterprises can predict future demand trends and formulate more reasonable production plans and inventory strategies.

[0008] In conclusion, liquid level measurement plays an indispensable role in ensuring production safety, optimizing process control, conserving resources, protecting the environment, and supporting corporate decision-making. Therefore, the accuracy and reliability of liquid level measurement should be highly valued in all sectors.

[0009] In liquid nitrogen bioreactors, liquid level measurement plays a crucial role. Accurate monitoring of the liquid nitrogen level ensures that biological samples are properly preserved in a stable, low-temperature environment, preventing temperature fluctuations caused by excessively low liquid levels, which could negatively impact sample quality and viability. Simultaneously, liquid level measurement provides operators with timely reminders to replenish the liquid, guaranteeing the normal operation of the liquid nitrogen bioreactor and the long-term preservation of samples.

[0010] Therefore, it is of great importance to design a calibration system for a temperature sensor-based liquid level measurement device to effectively solve the traceability problem of this device. Utility Model Content

[0011] To address the shortcomings of the aforementioned technologies, this invention proposes a calibration system for a liquid level measuring device based on a temperature sensor. The system consists of three parts: two temperature generators, a standard temperature measuring device, and a test insulation frame. It effectively solves the problem of calibration traceability for liquid level measuring devices based on temperature sensors and has broad application prospects.

[0012] The liquid level measurement device calibration system based on a temperature sensor proposed in this utility model includes: two temperature generators, a standard temperature measuring device, and a test insulation frame; wherein,

[0013] The test insulation frame is fixed on five sides, with one side being an openable, heat-insulating transparent glass panel. The test insulation frame has through holes, standard temperature measuring device mounting holes, fixing screws, and fixing rails. The through holes allow the liquid level measuring device to pass through. The standard temperature measuring device mounting holes and fixing screws allow the standard temperature measuring device to pass through and be fixed. The fixing rails are used to adjust the position of the liquid level measuring device. The temperature generator is located within the test insulation frame and includes a liquid temperature circulation generator and a solid temperature generator. The standard temperature measuring device provides a standard temperature value.

[0014] In this invention, the temperature generator and the standard temperature measuring device are mounted in the test insulation frame by fasteners; the liquid temperature circulation generating device and the solid temperature generating device are closely connected.

[0015] In this invention, a heat insulation structure is provided between the temperature generators; the heat insulation structure has a through hole for the liquid level measuring device to pass through. A heat insulation film is provided at the through hole for heat insulation. The midpoint of the test position of two adjacent liquid level measuring devices coincides with the heat insulation structure separating the two temperature generators and is as close as possible to the upper surface of the liquid level measuring device.

[0016] In this invention, the standard temperature measuring device is installed and fixed at the test position of the liquid level measuring device of the temperature sensor being measured; the test position refers to the vicinity of the connection between the thermocouple anode and cathode. The bottom of the standard temperature measuring device is in the form of a metal sheath armor and has an adjustable external thread; the middle section uses a threaded tube that can be fixed in position. By adjusting the position and length of the threaded tube, the top temperature sensor is made to fit more closely to the temperature sensor of the liquid level measuring device being measured. The top temperature sensor is in the form of a flexible surface thermocouple or a resistance temperature detector (RTD) to ensure it fits closely to the sensor being measured; the standard temperature measuring device is equipped with a display device for displaying real-time standard temperature data. The display device is electrically connected to the flexible surface thermocouple or RTD and passes through the metal sheath armor and the threaded tube.

[0017] Preferably, the heat-insulating transparent glass is a hinged or insert-type structure.

[0018] This invention offers the following advantages: The temperature sensor-based liquid level measurement device calibration system calibrates the liquid level measurement device, facilitating traceability and ensuring the accuracy and reliability of its measurements. By combining a liquid bath and a solid bath, leveraging the advantages of good liquid convection and poor solid convection, heat transfer through the insulating film between devices is reduced, further improving measurement accuracy. Compared to traditional air baths, this method reduces temperature uniformity and fluctuation; compared to traditional liquid baths, it effectively prevents liquid leakage from the mounting hole of the temperature sensor; and compared to traditional solid baths, the liquid circulation method reduces temperature uniformity and fluctuation, while improving heating / cooling rates and measurement accuracy. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the calibration system for a liquid level measurement device based on a temperature sensor.

[0021] Figure 2 This is a schematic diagram of the calibration system for a liquid level measurement device based on a temperature sensor.

[0022] Figure 3 This is a schematic diagram of the calibration system for a liquid level measurement device based on a temperature sensor.

[0023] Figure 4 This is a schematic diagram of the calibration system for a liquid level measurement device based on a temperature sensor.

[0024] Figure 5 This is a schematic diagram of the internal structure of a calibration system for a liquid level measurement device based on a temperature sensor.

[0025] Figure 6 This is a calibration diagram of a temperature sensor-based liquid level measurement device calibration system.

[0026] Figure 7 This is a schematic diagram of the standard temperature measuring device in this utility model.

[0027] Figures 8-13 This is a schematic diagram of the structure of the liquid level measuring device in Embodiment 2 of this utility model.

[0028] Figures 14-16 This is a schematic diagram of the structure of the liquid level measuring device in Embodiment 3 of this utility model. Detailed Implementation

[0029] The utility model will be further described in detail below with reference to the specific embodiments and accompanying drawings. Except for the contents specifically mentioned below, the processes, conditions, and experimental methods for implementing this utility model are all common knowledge and general knowledge in the field, and this utility model has no particular limitations.

[0030] Figures 1-16 In the middle, 51-temperature generator; 52-standard temperature measuring device; 53-test insulation frame; 54-thermal insulated transparent glass; 55-fixing hole; 56-standard temperature measuring device fixing hole; 57-fixing screw; 58-thermal insulation structure; 59-liquid temperature circulation generating device; 60-solid temperature generating device; 61-fixed track; 62-thermal insulation film; 70-metal sheath armor; 71-external thread; 72-threaded tube; 73-flexible surface thermocouple or resistance temperature detector; 74-display device.

[0031] 1-Liquid level measuring gauge; 2-Data recording and processing device; 4-Base; 5-Thermocouple anode; 6-Thermocouple cathode; 7-Data transmission male port; 9-Connection structure; 10-Slide groove; 11-Level adjustment device; 12-Level balance plate; 13-Pulley; 16-Scale; 20-Data recording and transmitting device; 21-Data recording device; 22-Data transmitting device; 23-Data transmission female port; 24-Power supply; 25-Heat insulation shell; 30-Data analysis and processing device; 31-Data receiving device; 32-Data analysis device; 41-Data transmission female port; 42-Sensitive micro voltmeter; 43-Timer reset button; 44-Heat insulation shell; 201-Temperature control element.

[0032] Example 1: Calibration System for Liquid Level Measurement Device

[0033] The temperature sensor-based liquid level measurement device calibration system in this embodiment consists of three parts: two temperature generators 51, a standard temperature measuring device 52, and a test insulation frame 53. The temperature generators 51 consist of a liquid temperature circulation generator 59 and a solid temperature generator 60. The standard temperature measuring device 52 consists of a high-precision temperature sensor, which provides the system's temperature standard value. The test insulation frame 53 is constructed of thermal insulation materials (insulation cotton, insulation board), with one side consisting of a heat-insulating transparent glass 54, allowing real-time observation of the internal testing conditions. The heat-insulating transparent glass has an openable or insertable structure; after the solid is filled, it is closed to seal. The test insulation frame 53 has through holes 55 for fixing the liquid level measuring device under test, standard temperature measuring device fixing holes 56, fixing screws 57 for fixing the standard temperature measuring device 52, and a fixing track 61 for adjusting the liquid level measuring device under test.

[0034] The fixed track 61 is a groove for placing the liquid level measuring device, which makes it easy to fix the liquid level measuring device in the same position each time. This makes the placement position of the flexible surface thermocouple or resistance thermometer 73 of the standard temperature measuring device 52 relatively fixed, resulting in better measurement repeatability and lower uncertainty.

[0035] Two temperature generators 51 and two standard temperature measuring devices 52 are housed within a test insulation frame 53 and secured with fasteners. A heat insulation structure 58 exists between the two temperature generators 51, made of a heat-insulating material with good thermal insulation properties, such as a heat-insulating ceramic sheet. A heat-insulating film 62 is located at the through-hole 55; the size of the film can be adjusted according to the size of the liquid level measuring device to achieve tight sealing between temperature zones. The heat-insulating film primarily isolates the flow of solids on both sides, thereby reducing heat conduction through the hole. It can be made using materials that are poor thermal conductors. An opening can be made in the heat-insulating film according to the shape of the liquid level gauge, or a brush-like design can be used. After the liquid level gauge of the measuring device is inserted, the brush bristles isolate the flow of solids on both sides, ensuring that the temperature on both sides is not significantly affected. The use of a solid bath also takes into full account the relatively slower heat conduction of solids compared to liquids, resulting in more accurate measurements.

[0036] The bottom of the standard temperature measuring device 52 is in the form of a metal sheath armor 70, and has an adjustable external thread 71; the middle section adopts a threaded tube 72 that can be fixed in position. By adjusting the position and length of the threaded tube 72, the top temperature sensor can be made to fit more closely with the temperature sensor of the liquid level measuring device being measured. The top temperature sensor is in the form of a flexible surface thermocouple or a thermal resistor 73, which is made to fit closely with the sensor being measured; the standard temperature measuring device 52 is provided with a display device 74 for displaying real-time standard temperature data. The display device 74 is electrically connected to the flexible surface thermocouple or thermal resistor 73 and passes through the metal sheath armor 70 and the threaded tube 72.

[0037] The temperature generator 51 adopts a combination of liquid and solid bath. The liquid temperature circulation generating device 59 (generally using alcohol, high-temperature resistant oil, liquid nitrogen, etc.) and the solid temperature generating device 60 (generally using salt, sand, etc.) are closely connected. (Compared to traditional air baths, this method reduces temperature uniformity and fluctuation; compared to traditional liquid baths, it effectively avoids the problem of liquid leakage from the fixing hole of the temperature sensor being measured; compared to traditional solid baths, the liquid circulation method reduces temperature uniformity and fluctuation, and improves the heating and cooling rate and temperature measurement accuracy.) The standard temperature measuring device 52 is installed and fixed near the test position of the liquid level measuring device temperature sensor. The test insulation frame 53 includes a through hole 55 for the temperature sensor to pass through, a standard temperature measuring device fixing hole 56, and fixing screws 57 for fixing the standard temperature measuring device, as well as a fixing rail 61 for adjusting the liquid level measuring device. The liquid level measuring device under test, based on a temperature sensor, is inserted into the calibration system through the through-hole 55 and fixed in place. The heat-insulating film has a certain resistance and can play a fixing role. Alternatively, a clamp can be installed on both sides of the through-hole 55 to fix the liquid level measuring device. The distance between the two standard temperature measuring devices 52 is set according to the distance between the two adjacent temperature sensors of the liquid level measuring device (slid through the track 61, and fixed according to the scale after the position is determined). The midpoint of the two adjacent temperature sensors coincides with the insulating heat-insulating structure 58 between the two temperature generators and is as close as possible to the surface of the liquid level measuring device. The midpoint of the two adjacent temperature sensors of the liquid level measuring device coincides with the insulating heat-insulating structure 58 between the two temperature generators. After the test is completed, the liquid level measuring device is moved in sequence to calibrate the temperature sensor group (two adjacent ones form a group) formed by the thermocouple anode and thermocouple cathode on it. Finally, the calibration result is obtained.

[0038] The structure of the liquid level measuring device in this embodiment is as follows: Figures 8-13 As shown, it includes a liquid level measuring gauge 1 and a data recording and processing device 2. The liquid level measuring gauge 1 includes a base 4, each base having at least three thermocouple anodes 5 and one thermocouple cathode 6, and a data transmission port 7. The connection point 8 is the temperature measuring point. On the base, the connection points of the thermocouple anodes and thermocouple cathodes are evenly distributed to form a temperature measuring array. There are connecting structures 9 at the top and bottom of each base layer to achieve a rigid connection between the two base layers, and at the same time, the corresponding thermocouple data can be transmitted to the upper base layer. There are data transmission wires inside the base 4, and the data transmission of each base layer is realized through the connecting structure 9, and then connected to the data recording device through the data insertion machine. The side of the base 4 has a sliding groove 10. The level adjustment device 11 consists of a low-density horizontal balance plate 12 and a pulley 13. The horizontal balance plate 12 can float on the surface of the liquid being measured and maintain balance, so that the liquid level measuring gauge can be kept perpendicular to the liquid surface being measured, and the liquid level measuring gauge can automatically reach the bottom of the container.

[0039] The data recording and processing apparatus in this embodiment includes a data recording and transmitting device 20 and a data analysis and processing device 30. The data recording and transmitting device 20 includes a data recording device 21, a data transmitting device 22, a data transmission header 23, a power supply 24, and a heat-insulating housing 25. The data recording device 21, the data transmitting device 22, and the power supply 24 are housed inside the heat-insulating housing 25. The power supply 24 provides power to the data recording device 21 and the data transmitting device 22. The data recording and transmitting device is used to record the data measured by the liquid level measurement and simultaneously transmit the data externally. The data analysis and processing device 30 includes a data receiving device 31. The data analysis and processing device is used to process and analyze the data measured by the liquid level measuring gauge to obtain the liquid level value.

[0040] The calibration system of this invention is used as follows: Adjust the position of the threaded tube 72 so that the flexible surface thermocouple or resistance thermometer 73 is close to the temperature sensor on the liquid level measuring device. Insert the liquid level measuring device through the through hole 55, and align the midpoint of the two adjacent temperature sensors to be measured with the insulating and heat-insulating structure 58 between the two temperature generators. Fill the solid temperature generator 51 with solid (such as salt or sand). Turn on the preheating temperature generator 51 to the set temperature. After it reaches the set temperature and stabilizes, read the data of the two adjacent temperature sensors of the liquid level measuring device based on the temperature sensor, and calculate the difference between them, ΔT. 实际 Read the temperature data T1 and T2 from the standard temperature measuring device 52, and calculate the difference between them ΔT. 标准 The corresponding temperature deviation value ΔT = |ΔT| is obtained. 实际 |-|△T 标准 Repeat the above steps to calibrate the data of each adjacent temperature sensor on the liquid level measuring device in sequence. The calibration scale shown on the liquid level measuring device is ΔH = H. 实际 -H 标准 Combined with temperature sensor data, a calibration report is generated; H 实际 H represents the actual scale height value of the liquid level measuring device. 标准 This is the reading from a standard temperature measuring device.

[0041] After the test, shut down the calibration system for the temperature sensor-based liquid level measuring device. Once the temperature has returned to normal, remove the standard temperature measuring device 52 and the measured liquid level measuring device, and remove any solid material (such as salt or sand) filling the solid temperature generator 51. The calibration report contains the data: the actual scale value H between adjacent sensors on the liquid level gauge of the measured liquid level measuring device. 实际 (Reading the scale directly from the ruler), the standard scale value H between adjacent sensors. 标准 (Read the scale from the standard temperature measuring device), the temperature deviation value △T between adjacent sensors, and the scale deviation value △H between adjacent sensors.

[0042] Furthermore, such as Figures 14-16 As shown, if the liquid level measuring ruler is equipped with a temperature control element 201, the data recording and processing device consists of a data transmission port 41 connected by circuit, a sensitive micro voltmeter 42, a timing reset button 43, and a heat-insulating shell 44.

[0043] After the liquid level measuring device passes through the through hole 55, first check and shut down the temperature control element 201. Read the microvoltmeter data of the two adjacent sensors being measured, and calculate the difference ΔU between them. 实际 Read the temperature data T1 and T2 from the standard temperature measuring device 52; look up the table to calculate the voltage data U1 and U2 corresponding to the temperature data T1 and T2 from the standard temperature measuring device 52, and further calculate ΔU. 标准 =U1-U2; Step 4: Calculate the micro-voltage deviation data △U=|△U 实际 |-|△U 标准 |, and the corresponding temperature deviation value △T is calculated.

[0044] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0045] As used in this invention, the term "comprising" is an open-ended expression, meaning it includes the contents specified in this invention, but does not exclude other aspects.

[0046] As used in this invention, the term "and / or" includes any one and all combinations of one or more of the related listed items.

[0047] The scope of protection of this utility model is not limited to the above embodiments. Any variations and advantages that can be conceived by those skilled in the art without departing from the spirit and scope of the utility model are included in this utility model and are protected by the appended claims.

Claims

1. A temperature sensor based liquid level measurement device calibration system, characterized in that, include: Two temperature generators (51), a standard temperature measuring device (52), and a test insulation frame (53); among which, The test insulation frame (53) has one side that is an openable heat-insulating transparent glass (54); the test insulation frame (53) is provided with a through hole (55), a standard temperature measuring device fixing hole (56), fixing screws (57) and a fixing track (61); wherein, The through hole (55) is for the liquid level measuring device to pass through; the standard temperature measuring device fixing hole (56) and fixing screw (57) are for passing through and fixing the standard temperature measuring device (52); the fixing rail (61) is for adjusting the position of the liquid level measuring device. The temperature generator (51) is disposed inside the test insulation frame (53), and includes: a liquid temperature circulation generating device (59) and a solid temperature generating device (60); The standard temperature measuring device (52) is used to provide standard temperature values.

2. The temperature sensor based liquid level measurement device calibration system of claim 1, wherein, The temperature generator (51) and the standard temperature measuring device (52) are installed in the test insulation frame (53) by fasteners; the liquid temperature circulation generating device (59) and the solid temperature generating device (60) are closely connected.

3. The temperature sensor based liquid level measurement device calibration system of claim 1, wherein, A heat insulation structure (58) is provided between the temperature generators (51); the heat insulation structure (58) is provided with a through hole (55) for the liquid level measuring device to pass through.

4. The temperature sensor based liquid level measurement device calibration system of claim 1 or 3, wherein, A heat-insulating film (62) for heat insulation is provided at the through hole (55).

5. The calibration system for a liquid level measuring device based on a temperature sensor as described in claim 1, characterized in that, The standard temperature measuring device (52) is installed and fixed at the test position of the liquid level measuring device of the temperature sensor being measured; the test position refers to the vicinity of the connection between the thermocouple anode and cathode.

6. The temperature sensor based liquid level measurement device calibration system of claim 1, wherein, The bottom of the standard temperature measuring device (52) is in the form of a metal sheath armor (70) and has an adjustable external thread (71); the middle section adopts a threaded tube (72) that can be fixed in position. By adjusting the position and length of the threaded tube (72), the top temperature sensor can be made to fit more closely to the temperature sensor of the liquid level measuring device being measured. The top temperature sensor is in the form of a flexible surface thermocouple or a thermal resistor (73) to fit closely to the sensor being measured. The standard temperature measuring device (52) is provided with a display device (74) for displaying real-time standard temperature data. The display device (74) is electrically connected to the flexible surface thermocouple or thermal resistor (73) and passes through the metal sheath armor (70) and the threaded tube (72).

7. The temperature sensor based liquid level measurement device calibration system of claim 3, wherein, The midpoint of the test position of the two adjacent liquid level measuring devices coincides with the insulating and heat-insulating structure (58) between the two temperature generators (51) and is as close as possible to the upper surface of the liquid level measuring device being tested.

8. The temperature sensor based liquid level measurement device calibration system of claim 1, wherein, The heat-insulating transparent glass (54) is either a door-type or insert-type structure.

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