A portable liquid level sensor calibrator

Abstract

A portable liquid level sensor calibrator, comprising a pressure cylinder, one end of the pressure cylinder is connected with a lead-out air pipe, the other end of the pressure cylinder is provided with a sealable opening, the pressure cylinder is used for placing a sensor, and the lead-out air pipe is further communicated with a gas supply pump. The application can make the calibration of the liquid level sensor more convenient and fast.

Description

Technical Field

[0001] This utility model belongs to the technical field of liquid level calibrators, and specifically relates to a portable liquid level sensor calibrator. Background Technology

[0002] Power plants typically have a large number of submersible water level sensors installed in their water collection wells and at the lowest points of the plant buildings. There are also a large number of oil level sensors in the oil pans of the generator sets' guide bearings, speed governors, and gate hydraulic control stations. To ensure reliable operation and safe and stable equipment control, the measurement accuracy of these liquid level sensor elements must be calibrated every year.

[0003] The current method for calibrating liquid level sensor components is as follows: after filling a container with water or oil, the liquid level sensor is used to measure the liquid level in the container; after the measurement is completed, the liquid level depth is measured manually with a ruler, and the liquid level sensor is calibrated by comparing the manual detection result with the detection result of the liquid level sensor.

[0004] However, the above-mentioned verification methods have disadvantages such as limited verification range, usually within 1 meter in depth, outdated verification methods, bulky and inconvenient verification equipment, low verification accuracy, and low work efficiency. Utility Model Content

[0005] This invention provides a portable liquid level sensor calibrator to solve the problem of complex liquid level sensor calibration.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A portable liquid level sensor calibrator includes a pressure gas cylinder, one end of which is connected to an outlet gas tube, and the other end has a sealable opening. The pressure gas cylinder is used to place a sensor, and the outlet gas tube is connected to an air supply pump away from the pressure gas cylinder.

[0007] Furthermore, the pressure cylinder is fixed on the mounting base, and a level calibrator and a U-tube are fixed on the mounting base. One end of the U-tube is connected to the outlet gas pipe.

[0008] Furthermore, the end of the pressure cylinder with the opening is tapered, and the inner diameter of the pressure cylinder gradually increases from the opening inwards.

[0009] Furthermore, the opening is threaded with a cap, which is conical in shape.

[0010] Furthermore, the sensor is connected to a lead wire that extends from the opening into the pressure cylinder. The lead wire is fitted with a sealing ring, which is pressed between the pressure cylinder and the cap.

[0011] Furthermore, the outlet pipe is also connected to a pressure transmitter group, which includes multiple pressure transmitters, each corresponding to a different measurement range.

[0012] Furthermore, the outlet vent pipe is connected to multiple connecting pipes, each of which is connected to a corresponding pressure transmitter, and each connecting pipe is equipped with an on / off valve.

[0013] The present invention can achieve the following beneficial effects: 1. The portable liquid level sensor calibrator of this application uses pressure changes to simulate liquid level changes. By placing the liquid level sensor in a pressure cylinder, the purpose of calibrating the liquid level sensor can be achieved. It is not necessary to use a container to hold the liquid to be tested at a high level for calibration. This avoids the inconvenience of high-altitude operation and large and high-volume calibration instruments caused by large-range liquid level sensor calibration. The ease of operation is greatly improved. Compared with the traditional manual calibration method, the calibrator of this application is smaller in size, more convenient to carry, and the calibration is more convenient and faster.

[0014] 2. By setting up multiple pressure transmitters with different ranges, the calibration range of the calibrator in this application is wider, enabling the accuracy test of the liquid level sensor for detecting large range liquid pressure, and the calibration cost is low.

[0015] 3. The sealing of the lead wire protruding from the opening by using a sealing ring improves the accuracy of the liquid calibrator measurement in this application. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a plan view of a portable liquid level sensor calibrator according to the present invention.

[0017] The attached diagram lists the components represented by each number as follows: 1. Pressure gas cylinder; 11. Opening; 12. Cap; 2. Outlet gas pipe; 21. Connecting pipe; 3. Sensor; 31. Lead wire; 32. Sealing ring; 4. Gas supply pump; 5. Mounting base; 6. Level calibrator; 7. U-tube; 8. Pressure transmitter; 9. On / off valve. Detailed Implementation

[0018] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0019] like Figure 1As shown, a portable liquid level sensor calibrator includes a pressure cylinder 1. One end of the pressure cylinder 1 has an opening 11, and the pressure cylinder 1 is tapered at this end, meaning the inner diameter of the pressure cylinder 1 gradually increases from the opening 11 inwards. The other end of the pressure cylinder 1 is connected to an outlet pipe 2. An air supply pump 4 is connected to the outlet pipe 2, which supplies air to the pressure cylinder 1 through the outlet pipe 2, thereby adjusting the pressure inside the pressure cylinder 1. A sensor 3 is placed inside the pressure cylinder 1 through the opening 11. By adjusting the pressure inside the pressure cylinder 1, the sensor 3 can detect the liquid level.

[0020] The design principle of the portable liquid level sensor calibrator in this application is as follows: The theoretical relationship between liquid pressure and depth is P=ρ·g·H, where ρ is the density of the medium, g is the acceleration due to gravity, and H is the liquid level depth. For the same region and the same medium, K=ρ·g is a constant. Therefore, by using the formula P=K·H, as long as the constant K is measured, the pressure P can be measured, the depth H can be calculated, and thus the detection accuracy of the liquid level sensor 3 can be indirectly verified.

[0021] Therefore, the portable liquid level sensor calibrator of this application adjusts the air pressure in the pressure cylinder 1 using the air pump 4 to simulate the pressure experienced by the sensor 3 at different liquid depths. This pressure is then calculated and converted into a liquid level value. The theoretical standard value is then compared with the measured value of the liquid level sensor 3 to verify the measurement accuracy of the sensor 3. Using this portable liquid level sensor calibrator eliminates the need for a container filled with a high-level liquid to be measured for calibrating the sensor 3. The device is simpler and more convenient to use, and its smaller size makes it easier to carry. Compared to the previous method of immersing the sensor 3 in liquid and measuring the depth with a ruler, the detection accuracy is significantly improved. By adjusting the air pressure in the pressure cylinder 1, different liquid depths can be simulated, eliminating the need for a measuring ruler and enabling the verification of the accuracy of the liquid level sensor 3 when detecting liquid levels in deeper liquids.

[0022] A cap 12 is threaded onto the conical opening 11 of the pressure cylinder 1, and the shape of the cap 12 matches the shape of the conical opening 11 of the pressure cylinder 1. Typically, a lead wire 31 is connected to the sensor 3, which connects the sensor 3 to other components. When the sensor 3 is placed inside the pressure cylinder 1, the lead wire 31 extends from the opening 11. A sealing ring 32 is fixedly fitted onto the lead wire 31. After the lead wire 31 is extended, the sealing ring 32 seals the opening 11. Tightening the cap 12 then presses the sealing ring 32 between the cap 12 and the wall of the pressure cylinder 1, achieving a seal at the interface of the lead wire 31 and ensuring smooth depressurization and pressure maintenance of the pressure cylinder 1.

[0023] The exhaust pipe 2 is also connected to a pressure transmitter group, which includes multiple pressure transmitters 8 with different ranges.

[0024] A connecting pipe 21 is provided between each pressure transmitter 8 and the outlet gas pipe 2. An on / off valve 9 is installed on the connecting pipe 21, which allows the appropriate pressure transmitter 8 to be selected to detect the pressure in the pressure cylinder 1 according to the corresponding calibration range. The setting of the pressure transmitter group realizes segmented detection. The calibration of the small-range liquid level sensor 3 can improve the calibration accuracy, and the calibration of the large-range liquid level sensor 3 can ensure the full range calibration range.

[0025] This portable liquid level sensor calibrator also includes a mounting base 5, with a pressure gas cylinder 1 fixed on the mounting base 5. A leveling calibrator 6 and a U-tube 7 are fixed on the mounting base 5. One end of the U-tube 7 is connected to an outlet gas pipe 2, and the other end is connected to the atmosphere. The leveling calibrator 6 levels the mounting base 5, ensuring it is horizontal. The U-tube 7 then measures the K-value for different regions and liquid levels. Furthermore, by adding liquid level medium to the U-tube 7 and establishing pressure, the U-tube directly displays the liquid level depth represented by the current pressure, allowing determination of whether the calibrator is in good working order and meets calibration requirements.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A portable liquid level sensor calibrator, characterized in that: It includes a pressure gas cylinder (1), one end of which is connected to an outlet gas pipe (2), and the other end has a sealable opening (11). The pressure gas cylinder (1) is used to place a sensor (3), and the outlet gas pipe (2) is also connected to an air supply pump (4).

2. The portable liquid level sensor calibrator according to claim 1, characterized in that: The pressure gas cylinder (1) is fixed on the mounting base (5), and a level calibrator (6) and a U-tube (7) are fixed on the mounting base (5). One end of the U-tube (7) is connected to the outlet gas pipe (2).

3. The portable liquid level sensor calibrator according to claim 1, characterized in that: The pressure cylinder (1) has a tapered end with an opening (11), and the inner diameter of the pressure cylinder (1) gradually increases from the opening (11) inward.

4. A portable liquid level sensor calibrator according to claim 3, characterized in that: A cap (12) is threaded onto the opening (11), and the cap (12) is conical.

5. A portable liquid level sensor calibrator according to claim 4, characterized in that: The sensor (3) is connected to a lead wire (31), which extends from the opening (11) into the pressure cylinder (1). The lead wire (31) is fitted with a sealing ring (32), which is pressed between the pressure cylinder (1) and the cap (12).

6. A portable liquid level sensor calibrator according to claim 1, characterized in that: The outlet pipe (2) is also connected to a pressure transmitter group, which includes multiple pressure transmitters (8), each of which corresponds to a different range.

7. A portable liquid level sensor calibrator according to claim 6, characterized in that: The outlet pipe (2) is connected to multiple connecting pipes (21), and each of the multiple connecting pipes (21) is connected to a multiple pressure transmitters (8). Each connecting pipe (21) is equipped with an on / off valve (9).

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