CN117053983A - On-site calibration disassembly-free pressure sensor and calibration method thereof - Google Patents
On-site calibration disassembly-free pressure sensor and calibration method thereof Download PDFInfo
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- CN117053983A CN117053983A CN202310921061.0A CN202310921061A CN117053983A CN 117053983 A CN117053983 A CN 117053983A CN 202310921061 A CN202310921061 A CN 202310921061A CN 117053983 A CN117053983 A CN 117053983A
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 35
- 238000009530 blood pressure measurement Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 239000008358 core component Substances 0.000 abstract description 10
- 239000000306 component Substances 0.000 abstract description 9
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
- G01L27/005—Apparatus for calibrating pressure sensors
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- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a field calibration disassembly-free pressure sensor, which comprises a pressure sensitive core component, a pressure measuring component and a calibration component, wherein the pressure sensitive core component is arranged on the pressure measuring component; the pressure-sensitive core component comprises a shell, a pressure-sensitive core and a circuit board, wherein an air chamber is arranged in the shell; the pressure measuring assembly comprises a pressure measuring pipeline, one end of the pressure measuring pipeline is provided with a pressure guiding port, and the other end of the pressure measuring pipeline is provided with a first switch valve; the calibration assembly comprises a calibration pipeline, a sealing piston and a driving piece, and one end of the calibration assembly is provided with a second switch valve; the sealing piston is positioned in the calibration pipe, and the driving piece is connected with the sealing piston. The circuit board controls the switch of the first switch valve and the second switch valve to switch the pressure measuring working mode and the calibration working mode. The invention also provides a calibration method of the pressure sensor. The pressure sensor is simple and convenient to operate, free from disassembly in field calibration, high in calibration precision, low in cost and applicable to occasions with severe environments, and external pressure sources are not required to be provided for calibration.
Description
Technical Field
The invention relates to the technical field of pressure sensors, in particular to a field calibration disassembly-free pressure sensor and a calibration method thereof.
Background
The pressure sensor is widely applied to pressure monitoring of aviation, aerospace, ships and industrial sites, and is an important device for pressure judgment.
When the current pressure sensor is calibrated on site, the pressure sensor needs to be disassembled and then connected into the pressure source for calibration, the operation is complex, the labor force is wasted, the time and economic loss caused by the fact that equipment is suspended in use are caused by the pressure sensor calibration, in addition, because the high-precision pressure source is required for the calibration, the number of instruments and equipment capable of realizing the high-precision pressure calibration is small, the functions are complete, the size is large, the carrying is unchanged, the precision is low, and the functions are single. In addition, because the pressure sensor may operate in different complex environments, the complex environments of on-site calibration may affect the accuracy of the etalon, thereby affecting the accuracy of the pressure sensor, such that a large error occurs in calibration.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a field calibration disassembly-free pressure sensor without an external pressure source and a calibration method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme:
a field calibration disassembly-free pressure sensor comprises a pressure sensitive core component, a pressure measuring component and a calibration component;
the pressure-sensitive core component comprises a shell, a pressure-sensitive core and a circuit board, wherein an air chamber is arranged in the shell, the pressure-sensitive core is positioned in the air chamber, and the circuit board is electrically connected with the pressure-sensitive core;
the pressure measuring assembly comprises a pressure measuring pipeline, one end of the pressure measuring pipeline is provided with a pressure guiding port, and a first switch valve is arranged between the other end of the pressure measuring pipeline and the air chamber;
the calibration assembly comprises a calibration pipeline, a sealing piston and a driving piece, and a second switch valve is arranged between one end of the calibration pipeline and the air chamber; the sealing piston is positioned in the calibration pipeline, and the driving piece is connected with the sealing piston and used for driving the sealing piston to slide in the calibration pipeline;
the circuit board is electrically connected with the first switch valve and the second switch valve respectively and is used for controlling the switch of the first switch valve and the second switch valve to switch different working modes; when the first switch valve is opened and the second switch valve is closed, the working mode is a pressure measurement working mode; when the first switch valve is closed and the second switch valve is opened, the working mode is a calibration working mode; the circuit board is connected with the driving piece and is used for driving the sealing piston to slide in the calibration pipeline through the driving piece in the calibration working mode so as to pressurize or/and depressurize the air chamber to realize pressure calibration.
As a further improvement of the above technical scheme:
the first switch valve and the second switch valve are electromagnetic valves.
The pressure sensitive core is a silicon piezoresistive core.
The driving piece is a driving motor.
The pressure sensitive core assembly, the pressure measuring assembly and the calibration assembly are all located inside the same shell.
As a general inventive concept, the present invention also provides a calibration method of the disassembly-free pressure sensor based on the above-mentioned field calibration, comprising:
the circuit board controls the switch of the first switch valve and the second switch valve to switch to different working modes; when the first switch valve is opened and the second switch valve is closed, the working mode is a pressure measuring working mode, and the pressure measuring pipeline is communicated with the air chamber;
when the first switch valve is closed and the second switch valve is opened, the working mode is a calibration working mode, and the calibration pipeline is communicated with the air chamber; in a calibration mode of operation, the drive member drives the sealing piston to slide within the calibration conduit to pressurize or/and depressurize the air chamber to achieve pressure calibration.
As a further improvement of the above technical scheme:
the specific process of pressure calibration is as follows:
when the sealing piston is positioned at different positions of the calibration pipeline, acquiring pressure values measured by corresponding pressure-sensitive core components at different positions;
and comparing the pressure values of the different positions with the reference pressure value of the opposite pressure position, and realizing pressure calibration according to the comparison result.
The specific process for obtaining the reference pressure value is as follows:
the pressure sensor is calibrated firstly, and after the calibration is completed, the sealing piston is moved to different positions of the calibration pipeline, and the pressure value measured by the pressure sensitive core component at the different positions is obtained and used as a reference pressure value of the corresponding position.
Compared with the prior art, the invention has the advantages that:
when the on-site calibration disassembly-free pressure sensor provided by the invention works in a calibration working mode, the driving piece is controlled by the circuit board to drive the sealing piston to move in the calibration pipeline so as to realize the control of the pressure in the air chamber, and the sealing piston can freely move in the calibration pipeline to continuously regulate the pressure in the air chamber. When the pressure sensor is calibrated, the pressure measuring working mode is directly switched to the calibration working mode through the switching of the first switching valve and the second switching valve, and the pressure measuring working mode is directly corrected through the calibration assembly, so that the pressure sensor is not required to be disassembled, the simplicity of the calibration work is ensured, and the calibration efficiency is improved. The pressure sensor is provided with the calibration assembly, so that the pressure source does not need to be provided externally, the accuracy of the external standard pressure source is prevented from being influenced by on-site environmental factors, the influence on the calibration accuracy of the pressure sensor is further avoided, the calibration efficiency is improved, the calibration cost is reduced, and the pressure sensor is suitable for application occasions with severe environments.
Drawings
Fig. 1 is a schematic structural diagram of a field calibration disassembly-free pressure sensor according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a field calibration disassembly-free pressure sensor according to an embodiment of the present invention in a pressure measurement mode of operation.
Fig. 3 is a schematic structural diagram of an in-situ calibration disassembly-free pressure sensor according to an embodiment of the present invention in a calibration operation mode.
The attached drawings are used for identifying and describing: 1. a pressure sensitive core assembly; 11. a circuit board; 12. a pressure sensitive core; 13. a housing; 14. a gas chamber; 2. a pressure measurement assembly; 21. a first switching valve; 22. a pressure measuring pipe; 23. a pressure guiding port; 3. a calibration assembly; 31. a second switching valve; 32. calibrating the pipeline; 33. a driving member; 34. a sealing piston; 4. a housing.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that, the terms "center," "upper," "lower," "horizontal," "inner," "outer," "top," "bottom," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and to simplify the description, rather than indicate or imply that the apparatus or elements being referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the present invention.
Referring to fig. 1, an embodiment of the present invention provides a field calibration disassembly-free pressure sensor, which includes a pressure sensitive core component 1, a pressure measuring component 2 and a calibration component 3;
the pressure-sensitive core component 1 comprises a shell 13, a pressure-sensitive core 12 and a circuit board 11, wherein an air chamber 14 is arranged in the shell 13, the pressure-sensitive core 12 is positioned in the air chamber 14, and the circuit board 11 is electrically connected with the pressure-sensitive core 12;
the pressure measuring assembly 2 comprises a pressure measuring pipeline 22, one end of the pressure measuring pipeline 22 is provided with a pressure guiding port 23, and a first switch valve 21 is arranged between the other end of the pressure measuring pipeline 22 and the air chamber 14;
the calibration assembly 3 comprises a calibration pipeline 32, a sealing piston 34 and a driving piece 33, wherein a second switch valve 31 is arranged between one end of the calibration pipeline 32 and the air chamber 14; a sealing piston 34 is positioned in the calibration pipe 32, and a driving member 33 is connected with the sealing piston 34 and is used for driving the sealing piston 34 to slide in the calibration pipe 32;
the circuit board 11 is electrically connected with the first switch valve 21 and the second switch valve 31 respectively and is used for controlling the switch of the first switch valve 21 and the second switch valve 31 to switch different working modes; when the first switching valve 21 is opened and the second switching valve 31 is closed, the operation mode is a pressure measurement operation mode (as shown in fig. 3); when the first on-off valve 21 is closed and the second on-off valve 31 is opened, the operation mode is a calibration operation mode (as shown in fig. 2); the circuit board 11 is connected to a driving member 33 for driving the sealing piston 34 to slide in the calibration pipe 32 by the driving member 33 in the calibration operation mode to pressurize or/and depressurize the air chamber 14 for pressure calibration.
The on-site calibration disassembly-free pressure sensor realizes the switching of a pressure measurement working mode and a calibration working mode through the switching of the first switch valve 21 and the second switch valve 31, and is convenient and quick to operate.
When the pressure sensor is in the calibration mode of operation, the first on-off valve 21 is closed and the second on-off valve 31 is open, the calibration conduit 32 being in communication with the air chamber 14. At this time, the driving member 33 is controlled by the circuit board 11 to drive the sealing piston 34 to move in the calibration pipe 32, so as to control the pressure in the air chamber 14, and further measure the pressure value of the pressure-sensitive core assembly 1, and calibrate the pressure value by comparing the measured pressure value of the pressure-sensitive core assembly 1 with a reference pressure value. The pressure sensor is provided with the calibration assembly 3, so that an external standard pressure source is not required to be provided for calibration, the accuracy of the external standard pressure source is prevented from being influenced by on-site environmental factors, the influence on the calibration accuracy of the pressure sensor is further avoided, the calibration efficiency is improved, the calibration cost is reduced, and the pressure sensor is suitable for application occasions with severe environments.
In the calibration assembly 3, the sealing piston 34 can freely move in the calibration pipe 32, so that the pressure in the air chamber 14 can be continuously adjusted, that is, the calibration pressures with different magnitudes and continuity can be provided, and the reliability of subsequent calibration is improved.
In addition, when the pressure sensor needs to be calibrated, the pressure measuring working mode is directly switched to the calibration working mode through the switching of the first switching valve 21 and the second switching valve 31, and the pressure sensor is directly calibrated through the calibration assembly 3, so that the pressure sensor does not need to be disassembled (after the pressure sensor needs to be disassembled in the conventional scheme, the pressure guiding port is in butt joint with an external standard pressure source to realize the calibration), the simplicity of the calibration work is ensured, and the calibration efficiency is improved.
In the present embodiment, the first switching valve 21 and the second switching valve 31 are both solenoid valves. Specifically, the solenoid valve includes a solenoid coil such that the circuit board 11 controls the opening and closing of the solenoid valve by controlling the solenoid coil, thereby controlling the calibration line 32 or the pressure measurement line 22 to communicate with the air chamber 14. Of course, a ball valve, a stop valve, or the like may be employed as long as communication and shutoff between the pipe and the air chamber can be achieved.
In this embodiment, the pressure sensitive core 12 is a silicon piezoresistive core, and the circuit board 11 is disposed on the silicon piezoresistive core. The silicon piezoresistive core has the advantages of small size, low cost, strong overload capacity, strong anti-interference capacity, high signal output sensitivity and the like.
In this embodiment, the driving member 33 is a driving motor. It will be appreciated that the circuit board 11 controls the forward and reverse rotation of the drive motor to drive the sealing piston 34 to slide within the calibration tube 32 to effect pressurization or depressurization of the air chamber 14.
In this embodiment, the pressure sensitive core assembly 1, the pressure measuring assembly 2 and the calibration assembly 3 are all located inside the same housing 4. It can be understood that the pressure-sensitive core component 1, the pressure measuring component 2 and the calibration component 3 are arranged in the same shell, so that the miniaturization and integration of the pressure sensor can be realized, the occupied space is smaller, and the pressure sensor can be used normally under the condition of limited operation space.
The embodiment of the invention also provides a calibration method of the disassembly-free pressure sensor based on the on-site calibration, which comprises the following steps:
the circuit board 11 controls the switching of the first switching valve 21 and the second switching valve 31 to switch to different operation modes; when the first switch valve 21 is opened and the second switch valve 31 is closed, the operation mode is a pressure measurement operation mode, and the pressure measurement pipeline 22 is communicated with the air chamber 14;
when the first switching valve 21 is closed and the second switching valve 31 is opened, the operation mode is a calibration operation mode, and the calibration pipe 32 is communicated with the air chamber 14; in the calibration mode of operation, the drive member 33 drives the sealing piston 34 to slide within the calibration conduit 32 to pressurize and/or depressurize the air chamber 14 to achieve pressure calibration.
Specifically, as shown in fig. 3, in the pressure measuring operation mode, the first switch valve 21 is opened, the second switch valve 31 is closed, the pressure introducing port 23 is communicated with the air chamber 14, and the air pressure to be measured enters the air chamber 14 through the pressure introducing port 23, so as to realize the pressure measuring function. The field calibration disassembly-free pressure sensor is suitable for small-range pressure sensors below 1 MPa.
It can be understood that the invention can realize the communication and the disconnection of the calibration pipeline 32 or the pressure measuring pipeline 22 and the air chamber 14 by controlling the opening and closing of the first switch valve 21 and the second switch valve 31 through the circuit board 11, thereby carrying out corresponding calibration work or pressure measuring work, and having convenient operation.
In this embodiment, the specific process of pressure calibration is:
when the sealing piston 34 is positioned at different positions of the calibration pipeline 32, acquiring pressure values measured by the corresponding pressure-sensitive core assembly 1 at the different positions;
and comparing the pressure values of the different positions with the reference pressure value of the opposite pressure position, and realizing pressure calibration according to the comparison result.
In this embodiment, the specific process of obtaining the reference pressure value is:
the pressure sensor is calibrated first, after calibration is completed, the sealing piston 34 is moved to different positions of the calibration pipeline 32, and the pressure value measured by the pressure sensitive core assembly 1 at the different positions is obtained and used as a reference pressure value of the corresponding position.
Specifically, the pressure sensor is put into a pressure measuring working mode (shown in fig. 3) before leaving the factory, and is calibrated by a standard pressure gauge. The pressure sensor will not drift (such as zero drift and sensitivity drift) upon completion of calibration, and the calibration mode (as shown in fig. 2) may be entered. In the calibration mode of operation, the sealing piston 34 is moved to a number of different positions within the calibration pipe 32, denoted: s1, S2, … … and SN, and measuring the pressure value at the corresponding position through the pressure sensitive core assembly 1, and marking as: p1, P2, … …, PN, the data of these one-to-one position points and pressure values are stored inside the pressure sensor (e.g., in the ROM of the chip of the circuit board 11) as reference pressure values. Thus, when the pressure sensor is calibrated on site, the pressure value actually measured at the specific position of the sealing piston 34 in the calibration pipeline 32 can be compared with the reference pressure value, the operation is convenient and fast, an external standard pressure source is not required to be provided for calibration and calibration, the calibration accuracy of the pressure sensor is prevented from being influenced by the accuracy of the external standard pressure source under the influence of on-site environmental factors, the calibration efficiency can be improved, the calibration cost is reduced, and the pressure sensor is suitable for application occasions with severe environments.
Of course, the above position points and the pressure values may be fitted into a function, and the functional expression may be stored in the circuit board 11, so that the accuracy of the field calibration is further improved compared with the pressure value of the corresponding position point.
While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art, or equivalent embodiments with equivalent variations can be made, without departing from the scope of the invention. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention shall fall within the scope of the technical solution of the present invention.
Claims (8)
1. The field calibration disassembly-free pressure sensor is characterized by comprising a pressure-sensitive core assembly (1), a pressure measuring assembly (2) and a calibration assembly (3);
the pressure-sensitive core assembly (1) comprises a shell (13), a pressure-sensitive core (12) and a circuit board (11), wherein an air chamber (14) is arranged in the shell (13), the pressure-sensitive core (12) is positioned in the air chamber (14), and the circuit board (11) is electrically connected with the pressure-sensitive core (12);
the pressure measuring assembly (2) comprises a pressure measuring pipeline (22), one end of the pressure measuring pipeline (22) is provided with a pressure guiding port (23), and a first switch valve (21) is arranged between the other end of the pressure measuring pipeline (22) and the air chamber (14);
the calibration assembly (3) comprises a calibration pipeline (32), a sealing piston (34) and a driving piece (33), wherein a second switch valve (31) is arranged between one end of the calibration pipeline (32) and the air chamber (14); the sealing piston (34) is positioned in the calibration pipeline (32), and the driving piece (33) is connected with the sealing piston (34) and used for driving the sealing piston (34) to slide in the calibration pipeline (32);
the circuit board (11) is electrically connected with the first switch valve (21) and the second switch valve (31) respectively and is used for controlling the switch of the first switch valve (21) and the second switch valve (31) to switch different working modes; when the first switch valve (21) is opened and the second switch valve (31) is closed, the working mode is a pressure measurement working mode; when the first switch valve (21) is closed and the second switch valve (31) is opened, the operation mode is a calibration operation mode; the circuit board (11) is connected with the driving piece (33) and is used for driving the sealing piston (34) to slide in the calibration pipeline (32) through the driving piece (33) in the calibration working mode so as to pressurize or/and depressurize the air chamber (14) to realize pressure calibration.
2. The field calibration disassembly-free pressure sensor according to claim 1, characterized in that the first switching valve (21) and the second switching valve (31) are solenoid valves.
3. The field calibrated disassembly-free pressure sensor of claim 1, wherein said pressure sensitive core (12) is a silicon piezoresistive core.
4. A field calibrated disassembly-free pressure sensor according to claim 1 or 2 or 3, characterized in that the driving member (33) is a driving motor.
5. A field calibrated disassembly-free pressure sensor according to claim 1 or 2 or 3, characterized in that the pressure sensitive core assembly (1), the pressure measuring assembly (2) and the calibration assembly (3) are all located inside the same housing (4).
6. A method of calibrating a field calibration disassembly-free pressure sensor based on any one of claims 1-5, comprising:
the circuit board (11) controls the switch of the first switch valve (21) and the second switch valve (31) to switch to different working modes; when the first switch valve (21) is opened and the second switch valve (31) is closed, the working mode is a pressure measuring working mode, and the pressure measuring pipeline (22) is communicated with the air chamber (14);
when the first switch valve (21) is closed and the second switch valve (31) is opened, the working mode is a calibration working mode, and the calibration pipeline (32) is communicated with the air chamber (14); in a calibration mode of operation, the drive member (33) drives the sealing piston (34) to slide within the calibration conduit (32) to pressurize or/and depressurize the air chamber (14) to effect pressure calibration.
7. The calibration method for calibrating a disassembly-free pressure sensor in situ according to claim 6, wherein the specific process of pressure calibration is:
when the sealing piston (34) is positioned at different positions of the calibration pipeline (32), acquiring pressure values measured by the corresponding pressure-sensitive core assembly (1) at the different positions;
and comparing the pressure values of the different positions with the reference pressure value of the opposite pressure position, and realizing pressure calibration according to the comparison result.
8. The method for calibrating a disassembly-free pressure sensor according to claim 7, wherein the specific process of obtaining the reference pressure value is:
the pressure sensor is calibrated firstly, and after the calibration is completed, the sealing piston (34) is moved to different positions of the calibration pipeline (32), and the pressure value measured by the pressure-sensitive core assembly (1) at the different positions is obtained and used as a reference pressure value of the corresponding position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310921061.0A CN117053983A (en) | 2023-07-25 | 2023-07-25 | On-site calibration disassembly-free pressure sensor and calibration method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310921061.0A CN117053983A (en) | 2023-07-25 | 2023-07-25 | On-site calibration disassembly-free pressure sensor and calibration method thereof |
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| CN117053983A true CN117053983A (en) | 2023-11-14 |
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| CN202310921061.0A Pending CN117053983A (en) | 2023-07-25 | 2023-07-25 | On-site calibration disassembly-free pressure sensor and calibration method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118482858A (en) * | 2024-07-15 | 2024-08-13 | 沈阳国仪检测技术有限公司 | Pulse fatigue test integrated testing machine and testing method for pressure sensor |
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2023
- 2023-07-25 CN CN202310921061.0A patent/CN117053983A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118482858A (en) * | 2024-07-15 | 2024-08-13 | 沈阳国仪检测技术有限公司 | Pulse fatigue test integrated testing machine and testing method for pressure sensor |
| CN118482858B (en) * | 2024-07-15 | 2024-10-01 | 沈阳国仪检测技术有限公司 | Pulse fatigue test integrated testing machine and testing method for pressure sensor |
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