CN112556926A - Automatic detection device and detection method for static pressure performance of differential pressure transmitter - Google Patents
Automatic detection device and detection method for static pressure performance of differential pressure transmitter Download PDFInfo
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Abstract
The invention belongs to the technical field of pressure detection, and discloses an automatic detection device for static pressure performance of a differential pressure transmitter, which comprises a detected differential pressure transmitter, wherein the low-pressure end of the detected differential pressure transmitter is communicated with a pressure controller through a first pipeline, the high-pressure end of the detected differential pressure transmitter is communicated with the pressure controller through a second pipeline, the low-pressure end and the high-pressure end of the detected differential pressure transmitter are communicated through a third pipeline, the first pipeline is provided with a first valve, the second pipeline is provided with a second valve and a standard pressure sensor, the third pipeline is provided with a third valve, the standard pressure sensor is used for detecting the pressure in the pipeline, the pressure controller is used for applying the pressure in the pipeline, the standard pressure sensor and the pressure controller are connected with an upper computer, and the upper computer is also connected with the detected differential pressure transmitter through a data acquisition instrument. The detection device only adopts one standard pressure sensor without a matched special piston weight, and has high automation degree and higher measurement accuracy.
Description
Technical Field
The invention relates to the technical field of pressure detection, in particular to an automatic detection device and a detection method for static pressure performance of a differential pressure transmitter.
Background
And (3) according to the pressure transmitter type evaluation outline JJF 1789-2019, wherein static pressure is a test item for inspecting the static pressure performance of the differential pressure transmitter. The instrument is composed of two piston pressure gauges with the same measuring range, each piston pressure gauge is provided with an independent pressure output port, pressure is respectively applied to a high-pressure end and a low-pressure end of the detected differential pressure transmitter during measurement, although the measuring range and the accuracy grade of the two piston pressure gauges are the same, the maximum allowable error of the generated differential pressure is plus or minus (0.01% -0.02%) relative to the error of the static pressure value in consideration of the fact that the positive deviation and the negative deviation of each piston pressure gauge relative to the pressure standard value are possibly different, the error requirements of some increasingly higher-precision differential pressure transmitters on the market during static pressure detection are not met, and self errors exist. In addition, the high-static pressure piston type pressure gauge device is complex and large, needs to be matched with a heavy special piston weight and a series of valves, is poor in using portability and complex in operation, and the utilization rate of each piston is low.
Disclosure of Invention
The invention provides an automatic detection device and a detection method for static pressure performance of a differential pressure transmitter, which solve the problems that two piston type pressure gauges are needed during detection of the existing differential pressure transmitter, and the measurement accuracy is limited. And the problems of poor portability, complex operation and the like due to the need of a matched piston special weight.
The invention can be realized by the following technical scheme:
an automatic detection device for static pressure performance of a differential pressure transmitter, wherein a low-pressure end of the detected differential pressure transmitter is communicated with a pressure controller through a first pipeline, a high-pressure end of the detected differential pressure transmitter is communicated with the pressure controller through a second pipeline, the low-pressure end and the high-pressure end of the detected differential pressure transmitter are communicated through a third pipeline,
the pressure detection device comprises a first pipeline, a second pipeline, a standard pressure sensor, a third pipeline, a pressure controller, a first valve, a second valve, a third valve, a data acquisition instrument, a pressure controller, a first valve, a second valve, a third valve, a pressure controller, a first valve, a second valve and a standard pressure sensor.
Further, the standard pressure sensor is arranged close to the pressure controller, and the second valve is arranged close to the high-pressure end of the detected differential pressure transmitter.
Further, the first valve, the second valve and the third valve are pneumatic electromagnetic constant volume valves and are all connected with an upper computer.
Further, the pressure controller is communicated with the vacuum pump and is also communicated with the air source through a pressure reducing valve, and the air source is also communicated with the first valve, the second valve and the third valve through pipelines.
Furthermore, one end of the third pipeline is communicated with the first pipeline through a first three-way valve and then communicated to the low-pressure end of the detected differential pressure transmitter, the other end of the third pipeline is communicated with the second pipeline through a second three-way valve and then communicated to the high-pressure end of the detected differential pressure transmitter, a hose is arranged in a region of the first pipeline, which is located at the low-pressure end of the first three-way valve and the detected differential pressure transmitter, and a hose is also arranged in a region of the second pipeline, which is located at the high-pressure end of the second three-way valve and the detected differential pressure transmitter.
Further, the hose is connected with the first three-way valve or the second three-way valve through an active joint.
A method for detecting the automatic detection device for the static pressure performance of the differential pressure transmitter based on the above, comprising the detection of the static pressure zero and the static pressure range change, wherein the detection of the static pressure zero comprises the following steps:
firstly, opening a first valve, a second valve and a third valve by means of the control of an upper computer, acquiring a current indication value of a detected differential pressure transmitter, namely a zero-position output value under zero pressure by using a data acquisition instrument, and storing the current indication value in the upper computer;
step two, sending a control command to a pressure controller by an upper computer, simultaneously loading pressure to the high-pressure end and the low-pressure end of the detected differential pressure transmitter by means of a vacuum pump and an air source until an indication value detected by a standard pressure sensor reaches a rated static pressure value of the detected differential pressure transmitter, then collecting a pressure value of the detected differential pressure transmitter at the moment, namely a zero position output value under the rated static pressure by using a data acquisition instrument, and storing the zero position output value in the upper computer,
then, sending a control command to a pressure controller through an upper computer, evacuating the pressure in the pipeline by means of a vacuum pump and an air source to restore the initial state, and closing a first valve, a second valve and a third valve;
calculating the variation of the zero-position output value under the zero pressure and the zero-position output value under the rated static pressure, and judging whether the variation meets the requirements of the metering technical specification or the enterprise standard;
the detection of the static pressure range change comprises the following steps:
step I, opening a first valve, a second valve and a third valve through the control of an upper computer, collecting a current indication value of a detected differential pressure transmitter, namely a zero-position output value under zero pressure by using a data acquisition instrument, and storing the current indication value in the upper computer;
step II, closing the first valve and the third valve, sending a control command to a pressure controller by an upper computer, simultaneously loading pressure to the high-pressure end and the low-pressure end of the detected differential pressure transmitter by means of a vacuum pump and an air source until the indication value detected by a standard pressure sensor reaches the full-scale pressure value of the detected differential pressure transmitter, then acquiring the indication value of the detected differential pressure transmitter at the moment, namely the full-scale output value under zero pressure by using a data acquisition instrument, storing the indication value in the upper computer, calculating the difference value between the zero-position output value and the full-scale output value under zero pressure, namely the full-scale output value under zero pressure,
opening the first valve and the third valve, then issuing a control command to the pressure controller through the upper computer, and evacuating the pressure in the pipeline to restore the initial state by means of the vacuum pump and the air source;
step III, sending a control command to a pressure controller through an upper computer, simultaneously loading pressure to the high-pressure end and the low-pressure end of the detected differential pressure transmitter by means of a vacuum pump and an air source until an indication value detected by a standard pressure sensor reaches a rated static pressure value of the detected differential pressure transmitter, then collecting a zero-position output value of the detected differential pressure transmitter at the moment, namely the zero-position output value under the rated static pressure value, by using a data acquisition instrument, and storing the zero-position output value in the upper computer;
step IV, closing the second valve and the third valve, sending a control command to a pressure controller by an upper computer, adjusting the pressure at the low-pressure end of the detected differential pressure transmitter by means of a vacuum pump and an air source until the indication value detected by a standard pressure sensor reaches the difference value between the rated static pressure value and the full range of the detected differential pressure transmitter, then acquiring the indication value of the detected differential pressure transmitter at the moment, namely the full range output value under the rated static pressure value by using a data acquisition instrument, storing the indication value in the upper computer, and calculating the difference value between the zero position output value and the full range output value under the rated static pressure value, namely the range output value under the rated static pressure value;
and opening the second valve and the third valve, then sending a control command to the pressure controller through the upper computer, evacuating the pressure in the pipeline by means of the vacuum pump and the air source to restore the initial state, and closing the first valve, the second valve and the third valve.
And V, calculating the variation of the range output value under the zero pressure and the range output value under the rated static pressure value, and judging whether the variation meets the requirements of the measurement technical specification or the enterprise standard.
The beneficial technical effects of the invention are as follows:
the invention uses only one high-precision pressure sensor as a standard device, and uses the short-term repeatability of the standard pressure sensor to generate a corresponding high-precision differential pressure value, thereby achieving the testing capability of measuring the differential pressure performance of the differential pressure transmitter, and the accuracy of the differential pressure value is superior to the differential pressure value generated by a high-static pressure piston type pressure gauge in the prior method.
In addition, through reasonable model selection and range matching of the pressure sensor and the pressure controller, full-range coverage of detection of the normal-pressure differential pressure transmitter can be met at one time, cost of the device is greatly reduced, adaptability and flexibility of the detection device are improved, and the device is easy to popularize and use.
Drawings
FIG. 1 is a schematic diagram of the general structure of the present invention, wherein solid lines represent gas circuit connecting pipes and dotted lines represent signal lines;
FIG. 2 is a schematic structural diagram of the marker I in FIG. 1 according to the present invention;
the device comprises a pressure transmitter to be detected, a pressure controller, a first valve, a second valve, a standard pressure sensor, a third valve, a standard pressure sensor, a vacuum pump, a gas source, a hose, a movable joint and a placing table, wherein the pressure transmitter to be detected is 1-2.
Detailed Description
The following detailed description of the preferred embodiments will be made with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides an automatic detection device for static pressure performance of a differential pressure transmitter, comprising a detected differential pressure transmitter 1, wherein a low pressure end of the detected differential pressure transmitter 1 is communicated with a pressure controller 2 through a first pipeline, a high pressure end is communicated with the pressure controller 2 through a second pipeline, the low pressure end and the high pressure end of the detected differential pressure transmitter 1 are communicated through a third pipeline, the first pipeline is provided with a first valve 3, the second pipeline is provided with a second valve 4 and a standard pressure sensor 5, the third pipeline is provided with a third valve 6, the standard pressure sensor 5 is used for detecting pressure inside the pipeline, is connected with an upper computer 7 and is used for applying pressure inside the pipeline, the standard pressure sensor 5 and the pressure controller 2 are connected with the upper computer 7, the upper computer 7 is further connected with the detected differential pressure transmitter 1 through a data acquisition instrument, the pressure controller 2 and the standard pressure sensor 5 are used for communicating the low-pressure end and the high-pressure end of the detected differential pressure transmitter 1 with pipelines with different internal pressures by controlling the on-off of the first valve, the second valve and the third valve, so as to complete the detection of the static pressure performance of the detected differential pressure transmitter 1. Therefore, the pressure controller 2 is used for simultaneously applying pressure to the detected differential pressure transformer 1, the first valve 3, the second valve 4 and the third valve 6 are utilized, the range of the detected differential pressure transformer 1 is adjusted by combining the standard pressure sensor 5, and the detection of the static pressure performance is completed.
The standard pressure sensor of 0.01 grade is equipped by the invention, and the relative error of the generated differential pressure value relative to the rated pressure of the differential pressure transmitter can be better than +/-0.005 percent by utilizing the short-term repeatability and stability of the standard pressure sensor. Compare in traditional high static pressure piston pressure gauge, also accomplished very big simplification in the operation when measuring, promoted detection efficiency, single high accuracy pressure sensor's cost is also lower than high static pressure piston pressure gauge simultaneously to through the range of changing standard pressure sensor, can realize the measuring ability of static pressure performance under the different rated static pressures, further promoted the flexibility of device.
In general, the output signal of the differential pressure transmitter can be measured by a digital multimeter, the output signal is usually 4-20mA, and the output signal is linearly corresponding to the zero point and the full range of the differential pressure transmitter, so that the data acquisition instrument can transmit the current signal of the differential pressure transmitter to the upper computer 7 by acquiring the current signal of the differential pressure transmitter to be used as an indication value for detecting the differential pressure transmitter.
In order to construct the detection condition of the detected differential pressure transmitter, pressures with different magnitudes need to be applied to two ends of the detected differential pressure transmitter, the standard pressure sensor 5 needs to be arranged close to the pressure controller 2, and the second valve 4 is arranged close to the high-pressure end of the detected differential pressure transmitter 1, so that after the second valve 4 is closed, the pressure corresponding to the high-pressure end of the detected differential pressure transmitter 1 can be kept, the pressure controller 2 applies pressure to the pipeline again, the pressure of the low-pressure end of the detected differential pressure transmitter 1 can be changed, and the standard pressure sensor 5 can detect the pressure inside the pipeline. Similarly, a reference pressure sensor 5 may also be provided in the line between the first valve 3 and the pressure controller 2.
The first valve 3, the second valve 4 and the third valve 6 can be set as pneumatic electromagnetic volume-fixed valves, and are connected with an upper computer 7. If a conventional valve is used, when the valve is opened and closed, the pressure value of the detected differential pressure transmitter 2 is changed due to the fact that the pipeline volume changes to cause huge changes of pipeline pressure, so that the pressure value becomes uncontrollable, and the overpressure of a standard pressure sensor can be caused even when the valve is opened and closed. The pneumatic electromagnetic constant volume valve adopted by the detection device is characterized in that two communicated cavities are arranged in the valve, and in the moving process of the valve needle, the volume increased or decreased by the medium in the cavity on one side is just equal to the volume decreased or increased by the medium in the cavity on the other side, but the total medium volume is kept unchanged, so that the pressure is kept unchanged when the valve is opened or closed. Therefore, the pressure sealing of the interior of the pipeline can be completed, and the upper computer 7 can conveniently control all valves.
Meanwhile, the pressure controller 2 is communicated with a vacuum pump 8 and is also communicated with a gas source 9 through a pressure reducing valve, and the gas source 9 is also communicated with the first valve 3, the second valve 4 and the third valve 6 through pipelines to provide gas sources for the first valve, the second valve and the third valve.
In order to meet the detection of more types of differential pressure transmitters, one end of the third pipeline is communicated with the first pipeline through a first three-way valve and then communicated with the low-pressure end of the detected differential pressure transmitter 1, the other end of the third pipeline is communicated with the second pipeline through a second three-way valve and then is communicated with the high-pressure end of the detected differential pressure transmitter 1, the area of this first line at the low pressure end of the first three-way valve and the tested differential pressure transmitter 1 is provided as a hose 10, which, as shown in figure 2, the area of the second pipe line at the high-pressure end of the second three-way valve and the tested differential pressure transmitter 1 is also provided as a hose 10, and, this hose 10 passes through loose joint 11 and is connected with first three-way valve or second three-way valve, also can be connected with the high pressure end, the low pressure end of being examined differential pressure transmitter 1 through loose joint as required, simultaneously, can also set up one and place platform 12 for place be examined differential pressure transmitter 1. Thus, since different types of differential pressure transmitters may have different volumes and different positions of the low pressure end and the high pressure end, the flexible tube 10 can be easily moved and bent, and the movable joint 11 can be easily disassembled to adapt to different types of differential pressure transmitters. The maximum pressure resistance of the pipeline and the movable joint selected by the detection device is 60MPa, and both are higher than the rated static pressure of most of differential pressure transmitters on the market.
The invention also provides a detection method based on the detection device, which comprises the following steps:
the static pressure performance item of the differential pressure transmitter consists of static pressure zero position and static pressure range change.
The static pressure zero position detection means that the same rated static pressure value is loaded at the high pressure end and the low pressure end of the differential pressure transmitter at the same time, and the pressure of the high pressure end and the low pressure end of the differential pressure transmitter are equal, so that the differential pressure transmitter is still in a zero position, and the variable quantity of the zero position reading of the differential pressure transmitter relative to the zero static pressure at the moment is recorded, namely the static pressure zero position detection.
When the detection device is used for measuring the static pressure zero position, the first valve 3, the second valve 4 and the third valve 6 are opened firstly, the high-pressure end and the low-pressure end of the detected differential pressure transmitter 1 are in a communicated state at the moment, the pressure is kept the same constantly, and the pressure is at zero pressure, and the indicating value of the detected differential pressure transmitter at the moment is recorded by the upper computer 7; then, sending a control command to the pressure controller 2 through the upper computer 7, adjusting the pipeline pressure by means of the vacuum pump 8 until the reading of the standard pressure sensor 5 reaches a specified rated static pressure value, recording the indication value of the detected differential pressure transmitter by using the upper computer 7, then sending the control command to the pressure controller through the upper computer, evacuating the pressure in the pipeline by means of the vacuum pump and the air source to restore the initial state, and closing the first valve, the second valve and the third valve; and finally, calculating the variable quantity of the two indicating values, and judging whether the variable quantity meets the requirements of the metering technical specification or the enterprise standard.
For the detection of the static pressure range change, the zero position and the full-range output value of the detected differential pressure transmitter are firstly measured under zero static pressure, the difference value of the zero position and the full-range output value of the detected differential pressure transmitter is the range output value under the zero static pressure, then the zero position and the full-range output value of the detected differential pressure transmitter under the rated static pressure value are measured, the difference value of the zero position and the full-range output value is the range change under the rated static pressure value, and finally, the difference value of the two range output values is calculated to be the static pressure range change:
when measuring the range output value under zero static pressure, the first valve 3, the second valve 4 and the third valve 6 can be opened according to the method, at this time, the high pressure end and the low pressure end of the detected differential pressure transmitter 1 are in a communicated state, the pressure is kept the same at all times and is under zero pressure, and the indication value, namely the zero-position output value of the detected differential pressure transmitter at this time is recorded by using the upper computer 7; then, the first valve 3 and the third valve 6 are closed, because the pipeline pressure is not affected when the constant volume valve is cut off, the pressure acting on the low-pressure end of the detected differential pressure transmitter 1 is kept unchanged, then a control command is sent to the pressure controller 2 through the upper computer 7, the pipeline pressure is adjusted by the vacuum pump 8 until the reading of the standard pressure sensor 5 reaches the full-scale pressure value of the detected differential pressure transmitter 1, the upper computer 7 is used for recording the indicating value of the detected differential pressure transmitter at the moment, namely the full-scale output value, the difference value of the two is the range output value under zero static pressure, then the upper computer sends a control command to the pressure controller, the pressure in the pipeline is evacuated and restored to the initial state by the vacuum pump and the air source, and the first valve, the second valve and the third valve are closed;
when measuring the range output value under the rated static pressure value, the method can also be according to the above, firstly opening the first valve 3, the second valve 4 and the third valve 6, at this time, the high pressure end and the low pressure end of the detected differential pressure transmitter 1 are in a communicated state, the pressure is kept the same all the time, then sending a control command to the pressure controller 2 through the upper computer 7, adjusting the pipeline pressure by the vacuum pump 8, simultaneously loading the pressure to the high pressure end and the low pressure end of the detected differential pressure transmitter 1 until the reading of the standard pressure sensor 5 reaches the rated static pressure value of the detected differential pressure transmitter 1, and then recording the indication value, namely the zero position output value, of the detected differential pressure transmitter by the upper computer 7; then, the second valve 4 and the third valve 6 are closed, because the pipeline pressure is not affected when the constant volume valve is cut off, the pressure acting on the high-pressure end of the detected differential pressure transmitter 1 is kept unchanged, then a control command is sent to the pressure controller 2 through the upper computer 7, the pipeline pressure is adjusted by the vacuum pump 8 until the reading of the standard pressure sensor 5 reaches the difference value between the rated static pressure value and the full-scale value of the detected differential pressure transmitter 1, the upper computer 7 is used for recording the current indication value of the detected differential pressure transmitter as the full-scale output value, the current difference value is the range output value under the zero static pressure, the current difference value is the range output value under the rated static pressure value, then the upper computer sends a control command to the pressure controller, the vacuum pump and the air source are used for evacuating the pressure in the pipeline to restore the initial state, and the first valve, the second valve and the air source are closed, A third valve;
and finally, calculating the difference value between the range output value under the zero static pressure and the range output value under the rated static pressure value, namely the static pressure range change of the detected differential pressure transmitter 1, and judging whether the requirement of the metering technical specification or the enterprise standard is met.
If the range change of the negative pressure is measured by the detected differential pressure transmitter, the first valve 3 and the third valve 6 are closed, and the other operations are the same.
Although specific embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely examples and that many variations or modifications may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is therefore defined by the appended claims.
Claims (7)
1. The utility model provides an automatic detection device for differential pressure transmitter static pressure performance which characterized in that: the low pressure end of the detected differential pressure transmitter is communicated with the pressure controller through a first pipeline, the high pressure end of the detected differential pressure transmitter is communicated with the pressure controller through a second pipeline, the low pressure end and the high pressure end of the detected differential pressure transmitter are communicated through a third pipeline,
the pressure detection device comprises a first pipeline, a second pipeline, a standard pressure sensor, a third pipeline, a pressure controller, a first valve, a second valve, a third valve, a data acquisition instrument, a pressure controller, a first valve, a second valve, a third valve, a pressure controller, a first valve, a second valve and a standard pressure sensor.
2. The automated differential pressure transmitter static pressure performance detection apparatus of claim 1, wherein: the standard pressure sensor is arranged close to the pressure controller, and the second valve is arranged close to the high-pressure end of the detected differential pressure transmitter.
3. The automated differential pressure transmitter static pressure performance detection apparatus of claim 2, wherein: the first valve, the second valve and the third valve are pneumatic electromagnetic constant volume valves and are all connected with an upper computer.
4. The automated differential pressure transmitter static pressure performance detection apparatus of claim 3, wherein: the pressure controller is communicated with the vacuum pump and is also communicated with the air source through a pressure reducing valve, and the air source is also communicated with the first valve, the second valve and the third valve through pipelines.
5. The automated differential pressure transmitter static pressure performance detection apparatus of claim 1, wherein: the one end of third pipeline is passed through first three-way valve and first pipeline intercommunication, communicates the low pressure end of examining differential pressure transmitter again, the other end of third pipeline passes through second three-way valve and second pipeline intercommunication, communicates the high pressure end of examining differential pressure transmitter again, the region that is in first three-way valve and the low pressure end of examining differential pressure transmitter in the first pipeline sets up to the hose, the region that is in the second three-way valve and the high pressure end of examining differential pressure transmitter in the second pipeline also sets up to the hose.
6. The automated differential pressure transmitter static pressure performance detection apparatus of claim 5, wherein: the hose is connected with the first three-way valve or the second three-way valve through the movable joint.
7. The method of claim 1, including the detection of a static pressure zero and a static pressure span change, wherein the detection of the static pressure zero includes the steps of:
firstly, opening a first valve, a second valve and a third valve by means of the control of an upper computer, acquiring a current indication value of a detected differential pressure transmitter, namely a zero-position output value under zero pressure by using a data acquisition instrument, and storing the current indication value in the upper computer;
step two, sending a control command to a pressure controller by an upper computer, simultaneously loading pressure to the high-pressure end and the low-pressure end of the detected differential pressure transmitter by means of a vacuum pump and an air source until an indication value detected by a standard pressure sensor reaches a rated static pressure value of the detected differential pressure transmitter, then collecting a pressure value of the detected differential pressure transmitter at the moment, namely a zero position output value under the rated static pressure by using a data acquisition instrument, and storing the zero position output value in the upper computer,
then, sending a control command to a pressure controller through an upper computer, evacuating the pressure in the pipeline by means of a vacuum pump and an air source to restore the initial state, and closing a first valve, a second valve and a third valve;
calculating the variation of the zero-position output value under the zero pressure and the zero-position output value under the rated static pressure, and judging whether the variation meets the requirements of the metering technical specification or the enterprise standard;
the detection of the static pressure range change comprises the following steps:
step I, opening a first valve, a second valve and a third valve through the control of an upper computer, collecting a current indication value of a detected differential pressure transmitter, namely a zero-position output value under zero pressure by using a data acquisition instrument, and storing the current indication value in the upper computer;
step II, closing the first valve and the third valve, sending a control command to a pressure controller by an upper computer, simultaneously loading pressure to the high-pressure end and the low-pressure end of the detected differential pressure transmitter by means of a vacuum pump and an air source until the indication value detected by a standard pressure sensor reaches the full-scale pressure value of the detected differential pressure transmitter, then acquiring the indication value of the detected differential pressure transmitter at the moment, namely the full-scale output value under zero pressure by using a data acquisition instrument, storing the indication value in the upper computer, calculating the difference value between the zero-position output value and the full-scale output value under zero pressure, namely the full-scale output value under zero pressure,
opening the first valve and the third valve, then issuing a control command to the pressure controller through the upper computer, and evacuating the pressure in the pipeline to restore the initial state by means of the vacuum pump and the air source;
step III, sending a control command to a pressure controller through an upper computer, simultaneously loading pressure to the high-pressure end and the low-pressure end of the detected differential pressure transmitter by means of a vacuum pump and an air source until an indication value detected by a standard pressure sensor reaches a rated static pressure value of the detected differential pressure transmitter, then collecting a zero-position output value of the detected differential pressure transmitter at the moment, namely the zero-position output value under the rated static pressure value, by using a data acquisition instrument, and storing the zero-position output value in the upper computer;
step IV, closing the second valve and the third valve, sending a control command to a pressure controller by an upper computer, adjusting the pressure at the low-pressure end of the detected differential pressure transmitter by means of a vacuum pump and an air source until the indication value detected by a standard pressure sensor reaches the difference value between the rated static pressure value and the full range of the detected differential pressure transmitter, then acquiring the indication value of the detected differential pressure transmitter at the moment, namely the full range output value under the rated static pressure value by using a data acquisition instrument, storing the indication value in the upper computer, and calculating the difference value between the zero position output value and the full range output value under the rated static pressure value, namely the range output value under the rated static pressure value;
and opening the second valve and the third valve, then sending a control command to the pressure controller through the upper computer, evacuating the pressure in the pipeline by means of the vacuum pump and the air source to restore the initial state, and closing the first valve, the second valve and the third valve.
And V, calculating the variation of the range output value under the zero pressure and the range output value under the rated static pressure value, and judging whether the variation meets the requirements of the measurement technical specification or the enterprise standard.
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| CN113432781A (en) * | 2021-04-24 | 2021-09-24 | 中国测试技术研究院流量研究所 | Static pressure characteristic test and effective area verification method for piston pressure gauge of differential pressure transmitter |
| CN113483947A (en) * | 2021-06-29 | 2021-10-08 | 中国航发沈阳发动机研究所 | Static pressure index detection device and method for differential pressure transmitter |
| CN113532734A (en) * | 2021-04-24 | 2021-10-22 | 中国测试技术研究院流量研究所 | Static pressure characteristic test and effective area verification method for piston pressure gauge of differential pressure transmitter |
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- 2020-12-11 CN CN202011458080.7A patent/CN112556926A/en active Pending
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| CN113432781A (en) * | 2021-04-24 | 2021-09-24 | 中国测试技术研究院流量研究所 | Static pressure characteristic test and effective area verification method for piston pressure gauge of differential pressure transmitter |
| CN113532734A (en) * | 2021-04-24 | 2021-10-22 | 中国测试技术研究院流量研究所 | Static pressure characteristic test and effective area verification method for piston pressure gauge of differential pressure transmitter |
| CN113532734B (en) * | 2021-04-24 | 2022-05-20 | 中国测试技术研究院流量研究所 | Static pressure characteristic test and effective area verification method for piston pressure gauge of differential pressure transmitter |
| CN113432781B (en) * | 2021-04-24 | 2023-03-10 | 中国测试技术研究院流量研究所 | Method for measuring static pressure characteristic of differential pressure transmitter and transmitting quantity value in verification process of piston type pressure gauge |
| CN113483947A (en) * | 2021-06-29 | 2021-10-08 | 中国航发沈阳发动机研究所 | Static pressure index detection device and method for differential pressure transmitter |
| CN113324692A (en) * | 2021-07-05 | 2021-08-31 | 北京康斯特仪表科技股份有限公司 | Pressure gauge, quick calibration method thereof and pressure calibration device |
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