CN201141794Y - Auxiliary device for micro-pressure sensor calibration - Google Patents
Auxiliary device for micro-pressure sensor calibration Download PDFInfo
- Publication number
- CN201141794Y CN201141794Y CNU200720065548XU CN200720065548U CN201141794Y CN 201141794 Y CN201141794 Y CN 201141794Y CN U200720065548X U CNU200720065548X U CN U200720065548XU CN 200720065548 U CN200720065548 U CN 200720065548U CN 201141794 Y CN201141794 Y CN 201141794Y
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- pressure
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- height
- pressure sensor
- pressure interface
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Abstract
The utility model discloses an auxiliary calibration device for micro-pressure sensor, a U-shaped tube is arranged on a housing 8, a leveling head 3 and an observing lens 4 thereof are arranged at one side of the U-shaped tube 13, a sealing screw 1, a first positive pressure interface 2 and a second positive pressure interface 12 are arranged at upper part of the U-shaped tube, the other side of the U-shaped tube 13 is connected with a static pressure interface 10 with an adjustable height and communicated with atmosphere, an adjusting disc 11 for adjusting the height of the static pressure interface 10 and a graduation for indicating the height of the static pressure interface 10 are arranged on the housing 8. When in operation, the auxiliary instrument is connected with a digital pressure meter and a to-be-calibrated sensor together, the output of the digital pressure meter can be adjusted according to the correct display of the auxiliary instrument, so as to finish the calibration of sensor. The auxiliary calibration device for micro-pressure sensor, can calibrate the pressure value provided by the digital pressure meter, thereby being able to perform the calibration for performance of micro-pressure sensor.
Description
Technical field
The utility model relates to a kind of alignment aid, particularly relates to a kind ofly aiming at micro-path difference pressure sensor (range being a kind of servicing unit that 0Pa～2KPa) carries out static calibration, and it and digital pressure gauge are used, and measuring accuracy can reach 0.1%.
Background technology
In recent years, flourish along with sensor technology, the application of micro-path difference pressure sensor is more and more wider.Therefore, the production scale of differential pressure pick-up is also increasing.But because the testing range of sensor only is number KPa, the digital pressure gauge or other calibration facilities that aim at this range design are less, so many manufacturers or applying unit are difficult to the sensor of this range is carried out static properties test and calibration.And the range of common digital pressure gauge is hundreds of KPa～tens of MPa on the market, though the digital pressure gauge of the type can provide the pressure of hundreds of Pa or number KPa, owing to be to fall range to use, its error reaches more than 20%, can not calibrate product.
The utility model content
Technical problem to be solved in the utility model provides a kind of can the correction the force value that digital pressure gauge provides, thus the micro-pressure sensor alignment aid that can calibrate the performance of micro-path difference pressure sensor.
In order to solve the problems of the technologies described above, the micro-pressure sensor alignment aid that the utility model provides, on shell, be provided with U type pipe, side pipe of described U type pipe is provided with level head and surveillance mirror thereof, top is provided with sealing screw and the first positive pressure interface and the second positive pressure interface, the static pressure interface that another side pipe end of described U type pipe is connected with adjustable height and communicates with atmosphere is provided with the adjustment dish of regulating described static pressure interface height and the scale of indicating described static pressure interface height on described shell.
Described shell is provided with level meter and horizontal adjustment screw.
Described level head is provided with the zeroing nut.
Described scale is the rule that is located at the described static pressure interface height of indication on the described shell.
Indicate the described scale of described static pressure interface height to be located on the described adjustment dish.
Adopt the micro-pressure sensor alignment aid of technique scheme, its principle of work is as follows: auxiliary machine is placed on the horizontal table top, regulates the adjustment dish, make the zero-bit of the pressure pointer of static pressure interface facing to rule; Regulate the horizontal adjustment screw then, make level meter be in the center, unload sealing screw, inject ionized water, make liquid level concordant substantially,, regulate the zeroing nut, make needle point and liquid level tangent again by surveillance mirror with the needle point of level head from this.Then the pressurization port of the positive pressurization interface of sensor to be calibrated, digital pressure is linked together with the first positive pressure interface and the second positive pressure interface of auxiliary machine respectively.At this moment, liquid level one termination pressure port, the other end is connected with the adjustment dish by water pipe, and liquid level can change with the rotation of adjustment dish.Digital pressure gauge is set, liquid level is applied a pressure signal, liquid level is descended; Adjust index dial then, make liquid level and level head tangent once again.Can know that according to pascal's principle digital pressure gauge institute applied pressure value equals the force value of other end water column, according to formula P=ρ * g * h * 10
-3Can obtain the accurate pressure value.In the formula, the spot pressure of P for calibrating, unit is Pa; ρ is the density of deionized water in the auxiliary machine, and unit is Kg/m
3H is the height of water level that shows on the index dial, and unit is mm; G is local acceleration of gravity, and unit is m/s
2
The utlity model has following advantage:
1, simple in structure, volume is little, and is easy to use.
2, be suitable for the calibration of micro-journey gauge pressure transducer and differential pressure pick-up.
3, measuring accuracy height reaches 0.1% accuracy requirement, i.e. pressure test deviation is ± 1Pa.
In sum, the utility model is a kind of can the correction the force value that digital pressure gauge provides, thus the micro-pressure sensor alignment aid that can calibrate the performance of micro-path difference pressure sensor.
Description of drawings
Fig. 1 is the utility model structural representation;
Fig. 2 is the utility model principle of work synoptic diagram.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Referring to Fig. 1 and Fig. 2, establish level meter 7 and horizontal adjustment screw 6 on the shell 8, on shell 8, be provided with U type pipe 13,13 1 side pipes of U type pipe are provided with level 3 and surveillance mirror 4 thereof, U type pipe 13 tops are provided with sealing screw 1 and the first positive pressure interface 2 and the second positive pressure interface 12, shell 8 is provided with the zeroing nut 5 of regulating level 3 height, the static pressure interface 10 that U type pipe 13 another side pipe ends are connected with adjustable height and communicate with atmosphere is provided with adjustment dish 11 and indication static pressure interface 10 rule 9 highly of regulating static pressure interface 10 height on shell 8.
On adjustment dish 11, be provided with the scale of indication static pressure interface 10 height.
Referring to Fig. 1 and Fig. 2, as follows with the concrete using method of auxiliary machine calibrating sensors:
1. the adjustment of auxiliary machine
At first auxiliary machine is wanted to place level.This realizes by the horizontal adjustment screw of adjusting on tool housing 8 bases 6.By rotating horizontal adjustment screw 6 up and down, make the spirit bubble of level meter 7 on shell 8 bases be in position placed in the middle, show that then auxiliary machine is horizontal, this moment can not mobile again instrument, if move once more, then needs to readjust.Then the static pressure of auxiliary machine is connect the zero-bit that 10 pressure pointer is aimed at rule, the needle point of level 3 wants tangent with liquid level just simultaneously, is convenient to like this observe.
2. equipment connects
Link together with the pressurization port of sensor and the pressurization port of digital pressure gauge respectively by the first positive pressure interface 2 and the second positive pressure interface 12 of flexible pipe auxiliary machine.Be the accuracy that shortens the pressure stability time and guarantee to test, the length of flexible pipe should be short as far as possible.The reference pressure port of sensor and auxiliary machine then directly connects atmosphere, and promptly reference edge pressure all is atmospheric pressure.
3. calibration traceability
According to the force value that will calibrate, regulate rolling disc 11, the pressure pointer of the static pressure interface 10 of auxiliary machine is aimed at relevant position on the rule 9.Suppose that the spot pressure that will calibrate is 1KPa, then according to P=ρ * g * h * 10
-3, with density p=1.0 * 10 of pressure value P=1000, deionized water
-3, g=9.8 substitution formula P=ρ * g * h * 10
-3Can get h=102mm, the position that then need the pressure pointer to be aimed at the 102mm on the rule 9 this moment gets final product.Control figure pressure gauge then applies the force value of 1000Pa.After the force value that shows Deng digital pressure gauge reached steady state (SS), the observation liquid level concerned with the position of level 3 needle point.When both are tangent, show that then digital pressure gauge institute applied pressure value is 1000Pa just; If liquid level is lower than the tip position of (being higher than) level 3, the actual pressure value that then shows digital pressure gauge and applied greater than (less than) 1000Pa, then need to reduce the value of setting of (increase) digital pressure gauge, till both are tangent.This moment can observation sensor output whether meet the requirements, perhaps adjust the output of sensor, make it reach desirable output state.Select another spot pressure then, calibrate once more according to the method described above.
Be the using method of auxiliary machine more than, utilize this instrument, can finish the gauge pressure that range is 2KPa or the debugging and the calibration of differential pressure pick-up, and measuring accuracy can reach 0.1%.Should note when the user uses this instrument following some:
1. at first must finish the adjustment (comprising the horizontal adjustment of instrument and the initially liquid level and the adjustment of level 3 tip position and the adjustment of original pressure pointer) of instrument, could guarantee the accuracy of test like this.
2. what show on the rule 9 is the water colunm height value, it or not concrete pressure displayed value, need calculate according to formula, and for guaranteeing the precision of test, need to calculate local gravity acceleration value, if necessary, also need difference, gravity acceleration value is revised according to sea level elevation.
3. the correct reading of digital pressure gauge institute applied pressure value should being as the criterion with auxiliary machine high scale value correspondence.For example work as the position 102mm that the pressure pointer on the auxiliary machine is aimed at, the force value that shows this liquid level reference edge is 1000Pa, and this is invariable.And by digital pressure gauge exert pressure make level balance after, its displayed value then has difference.Its displayed value may be 900Ka, also might be 1100Pa.The shown value of not only different digital pressure gauges is different, and the force value that a same exactly digital pressure gauge shows under different time is all slightly had any different.
4. the system testing error of instrument is very little, can ignore.The error of introducing in test process is formed aspect two.On the one hand not enough or connecting pipe is long for the impermeability of system's connection, cause the force value of positive pressure interface of the positive pressure interface of auxiliary machine and sensor different, caused the generation of error; On the other hand because the tester is judging that whether tangent whether liquid level, be easy to generate error, so can be unified according to personal habits when with the needle point of level head.
This utility model is applied to the digital pressure gauge of various ranges greater than 100KPa.
The utility model elaborates the content of invention.Anyone, any conspicuous change of under the prerequisite that does not deviate from invention spirit it being done all constitutes the infringement to the utility model patent, with corresponding legal responsibilities.
Claims (7)
1, a kind of micro-pressure sensor alignment aid, it is characterized in that: on shell (8), be provided with U type pipe, (13) side pipes of described U type pipe are provided with level head (3) and surveillance mirror (4) thereof, top is provided with sealing screw (1) and the first positive pressure interface (2) and the second positive pressure interface (12), the static pressure interface (10) that another side pipe end of described U type pipe is connected with adjustable height and communicates with atmosphere is provided with the adjustment dish (11) of regulating described static pressure interface (10) height and the scale of indicating described static pressure interface (10) height on described shell (8).
2, micro-pressure sensor alignment aid according to claim 1 is characterized in that: described shell (8) is provided with level meter (7) and horizontal adjustment screw (6).
3, micro-pressure sensor alignment aid according to claim 1 and 2 is characterized in that: described level head (3) is provided with zeroing nut (5).
4, micro-pressure sensor alignment aid according to claim 1 and 2 is characterized in that: described scale is for being located at the rule (9) of the described static pressure interface of indication (10) height on the described shell (8).
5, micro-pressure sensor alignment aid according to claim 3 is characterized in that: described scale is for being located at the rule (9) of the described static pressure interface of indication (10) height on the described shell (8).
6, micro-pressure sensor alignment aid according to claim 1 and 2 is characterized in that: indicate the described scale of described static pressure interface (10) height to be located on the described adjustment dish (11).
7, micro-pressure sensor alignment aid according to claim 3 is characterized in that: indicate the described scale of described static pressure interface (10) height to be located on the described adjustment dish (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720065548XU CN201141794Y (en) | 2007-12-25 | 2007-12-25 | Auxiliary device for micro-pressure sensor calibration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720065548XU CN201141794Y (en) | 2007-12-25 | 2007-12-25 | Auxiliary device for micro-pressure sensor calibration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201141794Y true CN201141794Y (en) | 2008-10-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200720065548XU Expired - Fee Related CN201141794Y (en) | 2007-12-25 | 2007-12-25 | Auxiliary device for micro-pressure sensor calibration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201141794Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106441698A (en) * | 2016-11-24 | 2017-02-22 | 中国石油大学(北京) | High-pressure unsteady micro-differential-pressure meter and using and verifying method thereof |
-
2007
- 2007-12-25 CN CNU200720065548XU patent/CN201141794Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106441698A (en) * | 2016-11-24 | 2017-02-22 | 中国石油大学(北京) | High-pressure unsteady micro-differential-pressure meter and using and verifying method thereof |
| CN106441698B (en) * | 2016-11-24 | 2018-04-27 | 中国石油大学(北京) | The unstable pressure difference meter of high pressure and its use and check method |
| US10094730B2 (en) | 2016-11-24 | 2018-10-09 | China University Of Petroleum-Beijing | High pressure dynamic micro differential pressure gauge, and methods for using and checking the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081029 Termination date: 20121225 |