Method for measuring liquid level of pool

Abstract

The invention relates to the technical field of pool liquid level measurement, and discloses a pool liquid level measurement method which comprises the following specific steps of tool preparation, installation and connection, equipment debugging, liquid level measurement and daily maintenance, display equipment in the step S3 is a computer, standard liquid level measurement equipment in the step S3 is a level gauge, and the display equipment in the step S3 is a computer. The pressure transmitter works based on a piezoresistive effect, a capacitance effect or other pressure sensitive principles, when liquid in a pool generates pressure on measuring diaphragms of the pressure transmitter, a sensor in the pressure transmitter converts a pressure signal into an electric signal, the pressure transmitter is provided with two sets of measuring diaphragms, and the two sets of measuring diaphragms are connected with the pressure transmitter. According to the method for measuring the liquid level of the water pool, the liquid level of the water pool can be accurately measured through high-precision measurement and calibration of the pressure transmitter, errors of a traditional liquid level measuring method are avoided, and the method is convenient to integrally install, easy to operate and suitable for liquid level measurement of various water pools.

Description

Technical Field

[0001] The invention relates to the technical field of water pool liquid level measurement, in particular to a method for measuring the water pool liquid level. Background Art

[0002] In industrial production and daily life, accurate measurement of pool liquid level is of great significance for water resource management, production process control, etc. Traditional liquid level measurement methods such as float level gauges and ultrasonic level gauges have problems such as low accuracy and susceptibility to interference. In addition, when adding a liquid level measurement device to a pool that has been put into use, it is not convenient to open a hole at the bottom of the existing pool, which makes it difficult to install. Therefore, we propose a method for measuring the liquid level of a pool. Summary of the invention

[0003] The object of the present invention is to provide a method for measuring the liquid level of a water pool to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a method for measuring the liquid level of a water pool, comprising the following specific steps:

[0005] S1. Prepare tools, such as flow guide tube, pressure transmitter and instrument stop valve. The selected flow guide tube, pressure transmitter and instrument stop valve should be compatible to ensure the stability and accuracy of measurement. The flow guide tube has good pressure resistance and sealing performance, and can withstand the pressure in the pool and prevent liquid leakage.

[0006] The pressure transmitter is selected according to the measurement range and accuracy requirements of the pool liquid, and has high accuracy, high stability and good anti-interference ability;

[0007] Instrument stop valve can easily control the flow of liquid.

[0008] S2. Installation and connection. Choose a suitable location on the pool wall. Use tools to install the connection location on the pool wall. The connection should be made at a relatively vertical and stable location on the pool wall. Avoid installing in places subject to water flow impact, vibration or large temperature changes. Insert one end of the guide tube into the pool through the connection port, and seal the connection between the guide tube and the connection port with sealing materials to prevent water leakage. Connect the other end of the guide tube to the pressure interface of the pressure transmitter. During this process, pay attention to the direction and tightness of the connection. Ensure that the connection is stable and reliable to avoid looseness or leakage during use. Install an instrument stop valve on the connecting pipeline between the pressure transmitter and the guide tube to control the flow of liquid when necessary.

[0009] S3. Equipment debugging, check the connection parts between various components, including the connection between the guide pipe and the pool, the guide pipe and the pressure transmitter, and the pressure transmitter and the instrument stop valve to ensure that there is no leakage, and check the switch status of the instrument stop valve to determine whether it is normal, connect the pressure transmitter to the power supply and display device, turn on the power, observe whether the output signal of the pressure transmitter is stable, and whether the display device displays the pressure value normally. According to the actual liquid level height of the pool, use standard liquid level measurement equipment for comparative measurement, and adjust the parameters of the pressure transmitter to make the output pressure value correspond to the actual liquid level height. By performing multiple calibrations, the measurement accuracy can be effectively improved;

[0010] S4. Liquid level measurement. Before the liquid level measurement, the stop valve of the missing instrument is in a fully open state, so that the pressure transmitter can accurately sense the pressure change in the water tank. The pressure value output by the pressure transmitter is read through the display device. According to the measurement principle of the pressure transmitter and the known liquid density parameters, the liquid level height h can be calculated by the following formula:

[0011]

[0012] Where h is the height of the water tank liquid level, ΔP is the pressure difference measured by the pressure transmitter, p is the liquid density, and g is the acceleration of gravity;

[0013] S5. Daily maintenance: regularly check the connection parts of the equipment to ensure that there is no leakage at each connection position. If leakage occurs, close the instrument stop valve in time, reconnect the leaking position, fill it with new sealing materials, clean the pressure transmitter, avoid dust and dirt affecting the measurement accuracy, and check the switching performance of the instrument stop valve.

[0014] Preferably, the display device in S3 is a computer, which can display the output signal of the pressure transmitter in real time, making it convenient for operators to observe and analyze.

[0015] Preferably, the standard liquid level measuring device in S3 is a level meter, which has high precision, high stability and good reliability.

[0016] Preferably, the pressure transmitter works based on piezoresistive effect, capacitive effect or other pressure-sensitive principles. When the liquid in the water pool generates pressure on the measuring diaphragm of the pressure transmitter, the sensor inside the pressure transmitter converts the pressure signal into an electrical signal. The pressure transmitter is provided with two groups of measuring diaphragms, and the heights of the two groups of measuring diaphragms are inconsistent. The pressure transmitter measures the pressure between different heights in the water pool and outputs the difference between the two as the pressure difference, which can effectively ensure the measurement accuracy.

[0017] Preferably, when checking the switch status of the instrument stop valve in S3, first perform a visual inspection to observe whether the appearance of the instrument stop valve has obvious damage, deformation or corrosion, and check whether the valve handwheel is intact and not loose. After the visual inspection, gently turn the valve handwheel to feel whether the rotation is smooth, gradually open the instrument stop valve from a fully closed state, observe the rise of the valve stem and the degree of opening of the valve, and then gradually close the valve from a fully open state, observe the descent of the valve stem and the degree of closing of the valve, and when the valve is in a closed state, check the sealing of the valve to ensure that there is no leakage.

[0018] Preferably, when the valve handwheel is difficult to turn or becomes stuck, it is checked and the cause is determined. If it is too easy to turn, the instrument stop valve also needs to be internally inspected.

[0019] Preferably, when gradually opening the valve from a fully closed state and gradually closing the valve from a fully open state, attention should be paid to whether the valve stem rises and falls smoothly to ensure that there is no jumping or skewing, and check whether there is abnormal resistance or sound when the valve is opened to different degrees to ensure that the valve can be completely closed without leakage.

[0020] Preferably, when calibrating the pressure transmitter in S3, a digital multimeter and a pressure calibrator are used, the pressure calibrator is connected to the pressure input port of the pressure transmitter through a pipeline, and the digital multimeter is connected to the output end of the pressure transmitter to measure its output signal, the pressure calibrator is turned on to make its output zero pressure, and the output signal of the pressure transmitter is observed. If it is not zero, the pressure transmitter is adjusted until the output is adjusted to the specified zero point value.

[0021] Preferably, the pressure calibrator gradually increases the output pressure to reach the full-scale value of the pressure transmitter, observes the output signal of the pressure transmitter, and if there is a deviation from the output value corresponding to the full-scale value, continues to fine-tune the pressure transmitter to make it output an accurate full-scale value. This can be done by gradually adjusting and repeating the calibration to complete the calibration of the pressure transmitter.

[0022] Compared with the prior art, the present invention provides a method for measuring the liquid level of a water pool, which has the following beneficial effects:

[0023] 1. This method of measuring the liquid level of a water pool can accurately measure the liquid level of the water pool through high-precision measurement and calibration of the pressure transmitter, avoiding the error of the traditional liquid level measurement method. It is easy to install and operate as a whole, and is suitable for liquid level measurement of various water pools.

[0024] 2. In this method of measuring the liquid level of the water pool, the pressure transmitter has good anti-interference ability and stability, can work in complex environments, ensures the reliability of the measurement results, and controls the liquid flow through the instrument stop valve, effectively improving the accuracy of the measurement.

[0025] 3. This method of measuring the liquid level of the water pool can effectively ensure the stability of the equipment operation by regularly maintaining and inspecting the equipment, and the overall disassembly and assembly is convenient and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the measurement steps of the present invention;

[0027] Figure 2 This is a schematic diagram of the connection status of the measuring device of the present invention. DETAILED DESCRIPTION

[0028] like Figure 1-Figure 2 As shown, the present invention provides a technical solution: a method for measuring the liquid level of a water pool, comprising the following specific steps:

[0029] S1. Prepare tools, such as flow guide tube, pressure transmitter and instrument stop valve. The selected flow guide tube, pressure transmitter and instrument stop valve should be compatible to ensure the stability and accuracy of measurement. The flow guide tube has good pressure resistance and sealing performance, and can withstand the pressure in the pool and prevent liquid leakage.

[0030] The pressure transmitter is selected according to the measurement range and accuracy requirements of the pool liquid, and has high accuracy, high stability and good anti-interference ability;

[0031] Instrument stop valve can easily control the flow of liquid.

[0032] S2. Installation and connection. Choose a suitable location on the pool wall. Use tools to install the connection location on the pool wall. The connection should be made at a relatively vertical and stable location on the pool wall. Avoid installing in places subject to water flow impact, vibration or large temperature changes. Insert one end of the guide tube into the pool through the connection port, and seal the connection between the guide tube and the connection port with sealing materials to prevent water leakage. Connect the other end of the guide tube to the pressure interface of the pressure transmitter. During this process, pay attention to the direction and tightness of the connection. Ensure that the connection is stable and reliable to avoid looseness or leakage during use. Install an instrument stop valve on the connecting pipeline between the pressure transmitter and the guide tube to control the flow of liquid when necessary.

[0033] S3. Equipment debugging, check the connection parts between various components, including the connection between the guide pipe and the water tank, the guide pipe and the pressure transmitter, and the pressure transmitter and the instrument stop valve to ensure that there is no leakage, and check the switch status of the instrument stop valve to determine whether it is normal. When checking the switch status of the instrument stop valve, first perform a visual inspection to observe whether the appearance of the instrument stop valve is obviously damaged, deformed or corroded, and check whether the valve handwheel is intact and not loose. After the visual inspection is completed, gently turn the valve handwheel to feel whether the rotation is smooth, gradually open the instrument stop valve from a fully closed state, and observe the rise of the valve stem and the degree of opening of the valve. , then gradually close the valve from a fully open state, observe the descent of the valve stem and the degree of closure of the valve. When the valve is in a closed state, check the sealing of the valve to ensure that there is no leakage. When turning the valve handwheel, if it is difficult or stuck, check it and determine the cause. If it is too easy to turn, it is also necessary to conduct an internal inspection of the instrument stop valve. When gradually opening the valve from a fully closed state and gradually closing the valve from a fully open state, pay attention to whether the valve stem rises and falls smoothly to ensure that there is no jumping or skewing. Check whether there is any abnormal resistance or sound when the valve is opened to different degrees to ensure that the valve can be completely closed without leakage.

[0034] Connect the pressure transmitter to the power supply and display device, turn on the power supply, observe whether the output signal of the pressure transmitter is stable, whether the display device displays the pressure value normally, and use the standard liquid level measurement equipment for comparative measurement according to the actual liquid level of the pool. By adjusting the parameters of the pressure transmitter, the output pressure value of the pressure transmitter corresponds to the actual liquid level. By performing multiple calibrations, the measurement accuracy can be effectively improved. When calibrating the pressure transmitter, use a digital multimeter and a pressure calibrator. Connect the pressure calibrator to the pressure input port of the pressure transmitter through a pipeline, and connect the digital multimeter to the pressure input port of the pressure transmitter. Connect a meter to the output end of the pressure transmitter to measure its output signal, turn on the pressure calibrator, make its output zero pressure, observe the output signal of the pressure transmitter, if it is not zero, adjust the pressure transmitter until the output is adjusted to the specified zero value, gradually increase the output pressure of the pressure calibrator to reach the full scale value of the pressure transmitter, observe the output signal of the pressure transmitter, if there is a deviation from the output value corresponding to the full scale, continue to fine-tune the pressure transmitter to make it output the accurate full scale value, gradually adjust, repeat the calibration, and the calibration of the pressure transmitter can be completed;

[0035] S4. Liquid level measurement. Before the liquid level measurement, the stop valve of the missing instrument is in a fully open state, so that the pressure transmitter can accurately sense the pressure change in the water tank. The pressure value output by the pressure transmitter is read through the display device. According to the measurement principle of the pressure transmitter and the known liquid density parameters, the liquid level height h can be calculated by the following formula:

[0036]

[0037] Where h is the height of the water tank liquid level, ΔP is the pressure difference measured by the pressure transmitter, p is the liquid density, and g is the acceleration of gravity;

[0038] S5. Daily maintenance: regularly check the connection parts of the equipment to ensure that there is no leakage at each connection position. If leakage occurs, close the instrument stop valve in time, reconnect the leaking position, fill it with new sealing materials, clean the pressure transmitter, avoid dust and dirt affecting the measurement accuracy, and check the switching performance of the instrument stop valve.

[0039] The display device in S3 is a computer, which can display the output signal of the pressure transmitter in real time, making it convenient for operators to observe and analyze.

[0040] The standard level measurement device in S3 is a level gauge, which has high precision, high stability and good reliability.

[0041] The pressure transmitter works based on the piezoresistive effect, capacitive effect or other pressure-sensitive principles. When the liquid in the water pool generates pressure on the measuring diaphragm of the pressure transmitter, the sensor inside the pressure transmitter converts the pressure signal into an electrical signal. The pressure transmitter is equipped with two sets of measuring diaphragms, and the heights of the two sets of measuring diaphragms are inconsistent. The pressure transmitter measures the pressure between different heights in the water pool and outputs the difference between the two as the pressure difference, which can effectively ensure the measurement accuracy.

[0042] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A method for measuring the liquid level of a pool, characterized in that: The specific steps include: S1. Prepare tools, including flow guide tube, pressure transmitter and instrument stop valve. The selected flow guide tube, pressure transmitter and instrument stop valve should be compatible. S2. Installation and connection. Select a suitable position on the pool wall, use tools to install the connection position on the pool wall, insert one end of the guide pipe into the pool through the connection port, and seal the connection position between the guide pipe and the connection port by using sealing materials. Connect the other end of the guide pipe to the pressure interface of the pressure transmitter. Pay attention to the direction and tightness of the connection during this process. Install an instrument stop valve on the connecting pipeline between the pressure transmitter and the guide pipe. S3. Equipment debugging, check the connection parts between various components, including the connection between the guide pipe and the pool, the guide pipe and the pressure transmitter, and the pressure transmitter and the instrument stop valve to ensure that there is no leakage, and check the switch status of the instrument stop valve to determine whether it is normal, connect the pressure transmitter to the power supply and display device, turn on the power, observe whether the output signal of the pressure transmitter is stable, whether the display device displays the pressure value normally, and use standard liquid level measurement equipment to perform comparative measurement according to the actual liquid level height of the pool, and adjust the parameters of the pressure transmitter to make the output pressure value correspond to the actual liquid level height, and perform multiple calibrations; S4. Liquid level measurement. Before the liquid level measurement, the stop valve of the missing instrument is in a fully open state, so that the pressure transmitter can accurately sense the pressure change in the water tank. The pressure value output by the pressure transmitter is read through the display device. According to the measurement principle of the pressure transmitter and the known liquid density parameters, the liquid level height h can be calculated by the following formula: Where h is the height of the water tank liquid level, ΔP is the pressure difference measured by the pressure transmitter, p is the liquid density, and g is the acceleration of gravity; S5. Daily maintenance: regularly check the connection parts of the equipment to ensure that there is no leakage at each connection position. If leakage occurs, close the instrument stop valve in time, reconnect the leaking position, fill it with new sealing materials, clean the pressure transmitter, avoid dust and dirt affecting the measurement accuracy, and check the switching performance of the instrument stop valve.

2. A method for measuring the liquid level of a water pool according to claim 1, characterized in that: The display device in S3 is a computer.

3. A method for measuring the liquid level of a water pool according to claim 1, characterized in that: The standard liquid level measuring device in S3 is a level gauge.

4. A method for measuring the liquid level of a water pool according to claim 1, characterized in that: The pressure transmitter works based on the piezoresistive effect, the capacitive effect or other pressure-sensitive principles. When the liquid in the water pool generates pressure on the measuring diaphragm of the pressure transmitter, the sensor inside the pressure transmitter converts the pressure signal into an electrical signal. The pressure transmitter is provided with two groups of measuring diaphragms, and the heights of the two groups of measuring diaphragms are inconsistent. The pressure transmitter measures the pressure between different heights in the water pool and outputs the difference between the two as the pressure difference.

5. A method for measuring the liquid level of a water pool according to claim 1, characterized in that: When checking the switch status of the instrument stop valve in S3, first perform a visual inspection to observe whether the appearance of the instrument stop valve is obviously damaged, deformed or corroded, and check whether the valve handwheel is intact and not loose. After the visual inspection, gently turn the valve handwheel to feel whether the rotation is smooth, gradually open the instrument stop valve from a fully closed state, observe the rise of the valve stem and the degree of opening of the valve, and then gradually close the valve from a fully open state, observe the descent of the valve stem and the degree of closing of the valve. When the valve is in a closed state, check the sealing of the valve to ensure that there is no leakage.

6. A method for measuring the liquid level of a water pool according to claim 5, characterized in that: When the valve handwheel is difficult to turn or stuck, check it and determine the cause. If it turns too easily, the instrument stop valve also needs to be internally inspected.

7. A method for measuring the liquid level of a water pool according to claim 5, characterized in that: When gradually opening the valve from a fully closed state and gradually closing the valve from a fully open state, it is necessary to pay attention to whether the valve stem rises and falls smoothly to ensure that there is no jumping or skewing, and check whether there is abnormal resistance or sound when the valve is opened to different degrees to ensure that the valve can be completely closed without leakage.

8. A method for measuring the liquid level of a water pool according to claim 1, characterized in that: When calibrating the pressure transmitter in S3, a digital multimeter and a pressure calibrator are used. The pressure calibrator is connected to the pressure input port of the pressure transmitter through a pipeline, and the digital multimeter is connected to the output end of the pressure transmitter to measure its output signal. The pressure calibrator is turned on to make its output zero pressure, and the output signal of the pressure transmitter is observed. If it is not zero, the pressure transmitter is adjusted until the output is adjusted to the specified zero point value.

9. A method for measuring the liquid level of a water pool according to claim 8, characterized in that: The pressure calibrator gradually increases the output pressure to reach the full-scale value of the pressure transmitter, and observes the output signal of the pressure transmitter. If there is a deviation from the output value corresponding to the full-scale value, continue to fine-tune the pressure transmitter to make it output an accurate full-scale value. This can be done by gradually adjusting and repeating the calibration to complete the calibration of the pressure transmitter.

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