CN117367657A - Method for measuring small pressure difference under high temperature and high pressure by using differential pressure transmitter - Google Patents
Method for measuring small pressure difference under high temperature and high pressure by using differential pressure transmitter Download PDFInfo
- Publication number
- CN117367657A CN117367657A CN202311469137.7A CN202311469137A CN117367657A CN 117367657 A CN117367657 A CN 117367657A CN 202311469137 A CN202311469137 A CN 202311469137A CN 117367657 A CN117367657 A CN 117367657A
- Authority
- CN
- China
- Prior art keywords
- pressure
- differential pressure
- transmitter
- pressure transmitter
- differential
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000012360 testing method Methods 0.000 claims abstract description 75
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 230000003068 static effect Effects 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
Abstract
The invention discloses a measuring method for testing small pressure difference under high temperature and high pressure by using a differential pressure transmitter, which relates to the technical field of differential pressure transmitters, wherein a high-pressure pipeline interface H end and a low-pressure pipeline L end interface are arranged on the differential pressure transmitter; obtaining a linear calibration coefficient of the relation between single-end pressure and actual pressure change of the differential pressure transmitter under a small range; under a wide range, obtaining linear calibration coefficients of the single-end pressure and actual pressure change relation of the full range differential pressure transmitter, and the like, and finally obtaining an actual pressure difference value calculated by five-bit meter values under corresponding pressure, namely the actual pressure difference.
Description
Technical Field
The invention relates to the technical field of differential pressure transmitters, in particular to a measuring method for testing small differential pressure at high temperature and high pressure by using a differential pressure transmitter.
Background
The differential pressure transmitter is a typical self-balancing detection instrument, overcomes the influence of adverse factors such as element materials, processing technology and the like by utilizing the working principle of negative feedback, is used for preventing media in a pipeline from directly entering the transmitter, and is connected with the transmitter by a capillary tube filled with fluid, and is used for measuring the liquid level, the flow and the pressure of liquid, gas or steam and converting the liquid level, the flow and the pressure into 4-20 mADC signals to be output.
However, in general, the service performance of the differential pressure transmitter is affected by various factors, such as measurement stability caused by over-high measurement range; static pressure has a large influence on zero point and range accuracy of the transmitter, and static pressure effects must be corrected. This causes great inconvenience and error in measuring small differential pressure at high temperature and high pressure using differential pressure transmitters.
In the differential pressure transmitter disclosed in the prior art, the working pressure is smaller with smaller measuring range, and the corresponding measuring range with larger working pressure is larger. Under the measurement environment facing high pressure and small pressure difference, accurate and stable measurement is difficult to achieve in the currently disclosed differential pressure transmitter. Although the differential pressure transmitter in the prior art can adjust the range ratio, the range setting is unreasonable, and when the differential pressure transmitter measures small differential pressure generated at high temperature and high pressure, the index accuracy of the differential pressure transmitter is greatly different from the actual use accuracy.
Disclosure of Invention
The invention aims to provide a measuring method for testing small pressure difference under high temperature and high pressure by using a differential pressure transmitter, and solves the problems by a simple and low-cost correction method.
The invention is realized by the following technical scheme:
the measuring method for testing small pressure difference under high temperature and high pressure by using a differential pressure transmitter comprises a differential pressure transmitter body, wherein a high-pressure pipeline interface H end and a low-pressure pipeline L end interface are arranged on the differential pressure transmitter;
the measuring method comprises the following steps:
s1, under a small range, a single end of a differential pressure transmitter is connected with a pressure testing device, the pressure testing device is utilized to test the change condition of the differential pressure transmitter in the small range in a gradient manner, corresponding data are recorded, and a linear calibration coefficient of the relation between the single end pressure of the differential pressure transmitter and the actual pressure change under the small range is obtained;
s2, under a large range, the single end of the differential pressure transmitter is connected with a nitrogen cylinder and a data acquisition instrument, and the corresponding data of the differential pressure transmitter and the data acquired by the data acquisition instrument are recorded by gradient test until reaching the highest range, and the linear calibration coefficient of the relation between the single end pressure of the differential pressure transmitter with the full range and the actual pressure change is obtained;
s3, the connection mode of the pressure display of the differential pressure transmitter and the pressure display calibration of the five-position gauge is as follows: the differential pressure transmitter is respectively connected with the five-position meter and the pressure testing device, and the pressure testing device is utilized to test by gradient pressurization, so that the linear calibration coefficient of the pressure display of the differential pressure transmitter and the pressure change relation of the five-position meter is obtained;
s4, the high static pressure repeatability test connection mode of the differential pressure transmitter is as follows: the two ends of the differential pressure transmitter are connected, the connecting pipeline is connected with the pressure testing device, the two ends of the differential pressure transmitter are pressurized simultaneously by utilizing the hand pump, the data is recorded by gradient pressurization test to the maximum range, after the data is tested to the maximum range, the pressure is relieved by gradient, the display data of the differential pressure transmitter and the current pressure data are recorded, and whether the pressure relief has influence on the measurement accuracy of the transmitter after pressurization is further verified;
s5, according to the steps S1-S4, testing a calibration coefficient between single-end pressure display and actual pressure of the differential pressure transmitter and a linear calibration coefficient between five-position gauge pressure display and differential pressure transmitter pressure display, and calculating the actual pressure through the five-position gauge pressure display and the calibration coefficient; the difference between the static pressure under the corresponding pressure and the actual pressure calculated by the five-bit meter value under the pressure is the actual pressure difference.
Further, in step S1, single-end pressure P of the differential pressure transmitter under a small measuring range is obtained cy The relation with the actual pressure change Δp is satisfied: p (P) cy ＝k d ΔP+b d Obtaining the linear calibration coefficient k d And b d 。
Further, in step S2, under a wide range, the differential pressure transmitter is connected with the nitrogen cylinder and the data acquisition instrument through a single end, and gradient test is performed until the highest range, data of the differential pressure transmitter and data acquired by the data acquisition instrument are recorded, so as to obtain single end pressure P of the full range differential pressure transmitter cy From actual pressure change DeltaP dh The relation is satisfied: p (P) cy ＝k dh ΔP dh +b dh Obtaining the linear calibration coefficient k dh And b dh 。
Further, in step S3, a pressure testing device is used to perform a test by using gradient pressurization to obtain a pressure display value P of the differential pressure transmitter cy And five gauge pressure value P w The relation is satisfied: p (P) w ＝k w P cy +b w Obtaining the linear calibration coefficient k w And b w 。
Further, according to the linear calibration coefficients obtained in the steps S1 to S3, the numerical value P on the five-bit table is observed during the test w According to the coefficient k measured in S3 w And b w Can be obtainedDifferential pressure transmitter pressure display value P cy ＝(P w -b w )/k w ；
At the time of testing the small range, according to the measured k in S1 d And b d And the calculated differential pressure transmitter pressure display value P cy The actual pressure change value ΔP= (P) cy -b d )/k d ；
In testing a wide range, according to the measured k in S2 dh And b dh And the calculated differential pressure transmitter pressure display value P cy The actual pressure change value ΔP= (P) cy -b dh )/k dh 。
Further, the recorded differential pressure transmitter related data includes: the pressure applied to the differential pressure transmitter, i.e., the actual pressure, is the differential pressure transmitter single-ended pressure.
Further, the gradient pressurization is to perform gradient pressure increase according to 5% -10% of the maximum range of the differential pressure transmitter.
In step S2, a pressure reducing valve is arranged at the gas outlet end of the nitrogen cylinder, and the pressure difference transmitter is connected with the pressure reducing valve through a single end and then is communicated with the nitrogen cylinder.
Further, the data acquisition instrument is a 624 display instrument.
Further, at the time of the test, each step was repeated 2 to 3 times, and the repeatability thereof was checked.
Compared with the prior art, the invention has the following advantages:
1. in the invention, the small pressure difference generated by two points can be accurately measured under high temperature and high pressure, the measuring range ratio can reach 20, the maximum working pressure can reach 100MPa, and the maximum working temperature can reach 250 ℃.
2. In the invention, the differential pressure transmitter is not required to be additionally modified, and the differential pressure transmitter can be corrected only by the method provided by the invention, so that the cost is low and the operability is strong.
Drawings
FIG. 1 is a schematic diagram of a differential pressure transmitter single-ended pressure and actual pressure calibration connection under a small measuring range.
FIG. 2 is a schematic diagram of the connection between single-end pressure and actual pressure calibration of the differential pressure transmitter in a wide range according to the present invention.
FIG. 3 is a diagram of the differential pressure transmitter and five-position meter calibration connection of the present invention.
FIG. 4 is a schematic diagram of a differential pressure transmitter high static pressure repeatability test connection of the present invention.
FIG. 5 is a schematic diagram of a differential pressure transmitter connected to a high temperature and high pressure mud circulation simulation device according to an embodiment.
FIG. 6 is a graph of a calibration repetition test fit over the range of differential pressure transmitter ranges.
FIG. 7 is a graph of a calibration repetition test fit over a range of differential pressure transmitter ranges over a wide range.
FIG. 8 is a graph of a calibration repetition test fit over a range of differential pressure transmitter ranges over a wide range.
FIG. 9 is a graph of the variation of a repeatedly pressurized pressure relief differential pressure transmitter at high static pressure.
Detailed Description
The present invention will be described in further detail with reference to examples, but embodiments of the present invention are not limited thereto.
Example 1
In order to facilitate public understanding of the scheme, the scheme is further described by taking an example that a measuring method for testing a small pressure difference under high temperature and high pressure by using a differential pressure transmitter is applied to a high temperature and high pressure slurry circulation friction resistance testing experimental device.
The high-temperature high-pressure mud circulation simulation device mainly comprises a mud circulation system, a pressure control system, a temperature control system and a data acquisition system, wherein the mud circulation system mainly comprises a high-temperature high-pressure circulation pump, the data acquisition system comprises a pressure sensor, a temperature sensor, a differential pressure sensor and the like on a circulation pipeline, and the change of the pressure in the pipe can cause the capacitance change of the differential pressure transmitter, so that the change of the pressure difference of the pipe section is measured, and the flow state of fluid in the circulation pipeline is recorded in real time. The various sensors are connected with data monitoring software through a wired network, so that remote data monitoring and acquisition can be realized.
Because the device is high-pressure small pressure difference in test, the common differential pressure transmitter in the market can not meet the test requirement. By the correction method for testing the small pressure difference under high temperature and high pressure by using the differential pressure transmitter, the differential pressure transmitter is modified and tested in an installation manner through a calibration process, so that the small pressure difference change can be tested under high pressure.
Specifically, referring to fig. 5, a fluid pipeline, a temperature control system, a pressure control system, a differential pressure transformer, and the like are related, wherein the fluid pipeline is in a closed circulation structure, and a transmitter body of the differential pressure transformer is provided with a high-pressure pipeline interface H end and a low-pressure pipeline L end interface.
In this example, a differential pressure transmitter was used having a maximum operating pressure of 100MPa and a maximum operating temperature of 250 ℃.
Furthermore, the single-end pressure change of the differential pressure transmitter is connected with the actual pressure change calibration according to the connection mode shown in fig. 1-2.
The first step:
as shown in fig. 1, the calibration connection mode of the single-end pressure and the actual pressure of the transmitter is implemented in a small range, namely, the calibration is implemented in a range of intercepting about 5% of the range of the differential pressure transmitter (5% of the range can be adjusted according to the requirement); under a small range, the single end of the differential pressure transmitter is connected with a pressure testing device, and the pressure testing device is used for testing the change condition of the differential pressure transmitter at the time of 0-6 kPa by taking 0.3kPa as a gradient. Recording the corresponding data of the pressure applied to the differential pressure transmitter, namely the actual pressure, the single-end pressure of the differential pressure transmitter and the like, obtaining the linear calibration coefficient of the single-end pressure and the actual pressure change of the differential pressure transmitter under a small range, and repeating for 2-3 times.
In the embodiment, single-end pressure P of the differential pressure transmitter under a small range is obtained cy The relation with the actual pressure change Δp is satisfied: p (P) cy ＝k d ΔP+b d Obtaining the linear calibration coefficient k d And b d 。
In this embodiment, the calibration experiment results within the range of the differential pressure transmitter under a small range are shown in table 1.
Table 1:
from the test data in table 1, the graph is plotted as shown in fig. 6, and it can be seen that the reproducibility is good.
By linear fitting the above test data, k can be derived d 0.7378, b d 87.6581.
And a second step of:
as shown in fig. 2, in a wide range, one end of the differential pressure transmitter is connected (typically, the connection to the high pressure end is selected, the high pressure port measures the high pressure, and the low pressure port measures the low pressure). And controlling external pressurization by using a gas cylinder pressure reducing valve and a 624 instrument display, and testing by taking 10-20 kPa as a gradient until the highest measuring range.
And recording data of the differential pressure transmitter and display data of a 624 instrument, obtaining linear calibration coefficients of single-end pressure and actual pressure change of the full-range differential pressure transmitter, repeating for 2-3 times, and checking the repeatability.
In this embodiment, according to the foregoing method, gradient testing is performed until the highest measurement range, and data of the differential pressure transmitter and data collected by the data collecting instrument are recorded to obtain single-end pressure P of the full-range differential pressure transmitter cy From actual pressure change DeltaP dh The relation is satisfied: p (P) cy ＝k dh ΔP dh +b dh Obtaining the linear calibration coefficient k dh And b dh 。
In this embodiment, the calibration test results within the range of the differential pressure transmitter under a wide range are shown in table 2.
TABLE 2
From the test data, the graph is plotted as shown in fig. 7, and it can be seen that the repeatability is good.
By linear fitting the above test data, k can be derived dh ＝0.75099，b dh ＝87.5884。
And a third step of:
further, the pressure display of the differential pressure transmitter and the pressure display calibration of the five-position meter are performed according to the connection mode shown in fig. 3, and the calibration method is used for calibrating the values displayed by the differential pressure transmitter and the five-position meter so as to find the relation between the values displayed by the five-position meter on the high-temperature high-pressure slurry circulating device and the values displayed by the differential pressure transmitter. The test was carried out using a pressure test apparatus and with a gradient of 5 kPa.
Recording data of a differential pressure transmitter and display data of a five-bit meter, obtaining the linear calibration coefficient of the pressure display of the differential pressure transmitter and the pressure of the five-bit meter, repeating for 2-3 times, and checking the repeatability.
In the embodiment, a pressure testing device is utilized to perform a test by gradient pressurization to obtain a pressure display value P of the differential pressure transmitter cy And five gauge pressure value P w The relation is satisfied: p (P) w ＝k w P cy +b w Obtaining the linear calibration coefficient k w And b w . Wherein, the differential pressure transmitter and the five-bit table display calibration data are shown in table 3.
TABLE 3 Table 3
From the test data, the graph is plotted as shown in fig. 8, and it can be seen that the repeatability is good.
By linear fitting the above test data, k can be obtained dh 1.79499, b dh Is-67.7007.
Fourth step:
further, the high static pressure repeatability test of the differential pressure transmitter is carried out according to the connection mode shown in fig. 4, and the stability of the differential pressure transmitter under the high static pressure is tested. And pressurizing the two ends of the differential pressure transmitter simultaneously by using a hand pump, testing to 100MPa by taking 10MPa as a gradient, and recording data.
After testing to 100MPa, simultaneously taking 10MPa as gradient pressure relief, recording display data of a differential pressure transmitter and current pressure data, repeating for 2-3 times, and checking the repeatability. Further verifying if pressure relief after pressurization has an impact on transmitter measurement accuracy. The experimental data of the high static pressure repeatability of the differential pressure transmitter are shown in table 4.
TABLE 4 Table 4
From the test data, the graph is plotted as shown in fig. 9, and it can be seen that the repeatability is good.
Fifth step:
and testing the calibration coefficient between the single-end pressure display and the actual pressure of the differential pressure transmitter and the linear calibration coefficient between the five-bit gauge pressure display and the differential pressure transmitter pressure display, and calculating the actual pressure through the five-bit gauge pressure display and the calibration coefficient.
The actual pressure difference between the static pressure under the corresponding pressure and the actual pressure calculated by the five-bit meter value under the pressure is the actual pressure difference.
Further, installing a differential pressure transmitter and a five-position meter which finish calibration to a high-temperature high-pressure slurry circulation friction resistance test experiment device, filling slurry, and debugging to the expected temperature pressure and flow.
Further, the differential pressure transmitter transmits remote data to the terminal, and the terminal calculates the differential pressure of the actual pipe section according to the calibration coefficient, so that the data can be analyzed.
In this embodiment, according to the linear calibration coefficients obtained in the first to third steps, the numerical value P on the five-bit table is observed during the test w According to the coefficient k measured in S3 w And b w The pressure display value P of the differential pressure transmitter can be obtained cy ＝(P w -b w )/k w ；
At the time of testing the small range, according to the measured k in S1 d And b d And the calculated differential pressure transmitter pressure display value P cy The actual pressure change value ΔP= (P) cy -b d )/k d ；
In testing a wide range, according to the measured k in S2 dh And b dh And the calculated differential pressure transmitter pressure display value P cy The actual pressure change value ΔP= (P) cy -b dh )/k dh 。
In this embodiment, the gradient pressurization is preferably performed by increasing the pressure in a gradient manner according to 5% -10% of the maximum range of the differential pressure transmitter.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present invention fall within the scope of the present invention.
Claims (10)
1. A measuring method for testing small pressure difference under high temperature and high pressure by using a differential pressure transmitter is characterized in that: the differential pressure transmitter comprises a differential pressure transmitter body, wherein a high-pressure pipeline interface H end and a low-pressure pipeline L end interface are arranged on the differential pressure transmitter;
the measuring method comprises the following steps:
s1, under a small range, a single end of a differential pressure transmitter is connected with a pressure testing device, the pressure testing device is utilized to test the change condition of the differential pressure transmitter in the small range in a gradient manner, corresponding data are recorded, and a linear calibration coefficient of the relation between the single end pressure of the differential pressure transmitter and the actual pressure change under the small range is obtained;
s2, under a large range, the single end of the differential pressure transmitter is connected with a nitrogen cylinder and a data acquisition instrument, and the corresponding data of the differential pressure transmitter and the data acquired by the data acquisition instrument are recorded by gradient test until reaching the highest range, and the linear calibration coefficient of the relation between the single end pressure of the differential pressure transmitter with the full range and the actual pressure change is obtained;
s3, the connection mode of the pressure display of the differential pressure transmitter and the pressure display calibration of the five-position gauge is as follows: the differential pressure transmitter is respectively connected with the five-position meter and the pressure testing device, and the pressure testing device is utilized to test by gradient pressurization, so that the linear calibration coefficient of the pressure display of the differential pressure transmitter and the pressure change relation of the five-position meter is obtained;
s4, the high static pressure repeatability test connection mode of the differential pressure transmitter is as follows: the two ends of the differential pressure transmitter are connected, the connecting pipeline is connected with the pressure testing device, the two ends of the differential pressure transmitter are pressurized simultaneously by utilizing the hand pump, the data is recorded by gradient pressurization test to the maximum range, after the data is tested to the maximum range, the pressure is relieved by gradient, the display data of the differential pressure transmitter and the current pressure data are recorded, and whether the pressure relief has influence on the measurement accuracy of the transmitter after pressurization is further verified;
s5, according to the steps S1-S4, testing a calibration coefficient between single-end pressure display and actual pressure of the differential pressure transmitter and a linear calibration coefficient between five-position gauge pressure display and differential pressure transmitter pressure display, and calculating the actual pressure through the five-position gauge pressure display and the calibration coefficient; the difference between the static pressure under the corresponding pressure and the actual pressure calculated by the five-bit meter value under the pressure is the actual pressure difference.
2. The method for measuring a small differential pressure at a high temperature and a high pressure by using a differential pressure transmitter according to claim 1, wherein: in step S1, single-end pressure P of the differential pressure transmitter under a small range is obtained cy The relation with the actual pressure change Δp is satisfied: p (P) cy ＝k d ΔP+b d Obtaining the linear calibration coefficient k d And b d 。
3. The method for measuring a small differential pressure at a high temperature and a high pressure by using a differential pressure transmitter according to claim 2, wherein: in step S2, under a large measuring range, the single end of the differential pressure transmitter is connected with the nitrogen cylinder and the data acquisition instrument, gradient test is carried out until the maximum measuring range is reached, data of the differential pressure transmitter and data acquired by the data acquisition instrument are recorded, and single end pressure P of the full-range differential pressure transmitter is obtained cy From actual pressure change DeltaP dh The relation is satisfied: p (P) cy ＝k dh ΔP dh +b dh And then getLinear calibration coefficient k dh And b dh 。
4. A method of measuring a small differential pressure at high temperature and high pressure using a differential pressure transmitter according to claim 3, wherein: in step S3, a pressure testing device is utilized to conduct testing by gradient pressurization, and a pressure display value P of the differential pressure transmitter is obtained cy And five gauge pressure value P w The relation is satisfied: p (P) w ＝k w P cy +b w Obtaining the linear calibration coefficient k w And b w 。
5. The method for measuring a small differential pressure at a high temperature and a high pressure by using a differential pressure transmitter according to claim 4, wherein: according to the linear calibration coefficients obtained in the steps S1 to S3, the numerical value P on the five-bit table is observed in the test w According to the coefficient k measured in S3 w And b w The pressure display value P of the differential pressure transmitter can be obtained cy ＝(P w -b w )/k w ；
At the time of testing the small range, according to the measured k in S1 d And b d And the calculated differential pressure transmitter pressure display value P cy The actual pressure change value ΔP= (P) cy -b d )/k d ；
In testing a wide range, according to the measured k in S2 dh And b dh And the calculated differential pressure transmitter pressure display value P cy The actual pressure change value ΔP= (P) cy -b dh )/k dh 。
6. The method of measuring a small differential pressure at a high temperature and a high pressure using a differential pressure transmitter according to claim 1, wherein the recorded differential pressure transmitter-related data includes: the pressure applied to the differential pressure transmitter, i.e., the actual pressure, is the differential pressure transmitter single-ended pressure.
7. The method for measuring a small differential pressure at a high temperature and a high pressure by using a differential pressure transmitter according to claim 1, wherein: the gradient pressurization is to increase the pressure in a gradient way according to 5% -10% of the maximum range of the differential pressure transmitter.
8. The method for measuring a small differential pressure at a high temperature and a high pressure by using a differential pressure transmitter according to claim 1, wherein: in the step S2, a pressure reducing valve is arranged at the air outlet end of the nitrogen cylinder, and a single end of the differential pressure transmitter is connected with the pressure reducing valve and then communicated with the nitrogen cylinder.
9. The method for measuring a small differential pressure at a high temperature and a high pressure by using a differential pressure transmitter according to claim 1, wherein: the data acquisition instrument is a 624 display instrument.
10. The method for measuring a small differential pressure at a high temperature and a high pressure by using a differential pressure transmitter according to claim 1, wherein: at the time of the test, each step was repeated 2 to 3 times, and its reproducibility was checked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311469137.7A CN117367657A (en) | 2023-11-07 | 2023-11-07 | Method for measuring small pressure difference under high temperature and high pressure by using differential pressure transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311469137.7A CN117367657A (en) | 2023-11-07 | 2023-11-07 | Method for measuring small pressure difference under high temperature and high pressure by using differential pressure transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117367657A true CN117367657A (en) | 2024-01-09 |
Family
ID=89398267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311469137.7A Pending CN117367657A (en) | 2023-11-07 | 2023-11-07 | Method for measuring small pressure difference under high temperature and high pressure by using differential pressure transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117367657A (en) |
-
2023
- 2023-11-07 CN CN202311469137.7A patent/CN117367657A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10816434B2 (en) | Apparatus and method for leak testing | |
| CN101281074B (en) | Pressure sensor calibrating method for test system with calibration scale | |
| JP5237261B2 (en) | Method for filling at least one compressed gas tank with at least one gas, connector for connection to an opening of the compressed gas tank, and compressed gas cylinder apparatus | |
| RU2358250C2 (en) | Calibration of pressure sensor during engineering process | |
| US9429493B2 (en) | Manifold assembly for a portable leak tester | |
| CN112484916B (en) | Temperature response characteristic calibration method for patch type pressure sensor | |
| US5207089A (en) | Method for measuring the control cross section area of a nozzle | |
| CN112556926A (en) | Automatic detection device and detection method for static pressure performance of differential pressure transmitter | |
| CN117367657A (en) | Method for measuring small pressure difference under high temperature and high pressure by using differential pressure transmitter | |
| CN116067565A (en) | Capacitive film vacuum gauge detection device and method | |
| CN213516228U (en) | Airtightness detection device of pressure detection instrument | |
| CN214277284U (en) | Differential pressure sensor calibration device | |
| CN115200793A (en) | Vacuum helium leak hole calibration method | |
| Wälchli et al. | Fundamental leak calibration system for gas leaks with a defined pressure difference over the leak element | |
| CN114459668A (en) | Non-contact pressure measuring method and system based on strain and temperature sensors | |
| JPH1137883A (en) | Method for measuring leak amount | |
| CN219511742U (en) | Capacitive film vacuum gauge detection device | |
| CN109781193A (en) | Turbine flowmeter calibrated in situ method applied to testing ground | |
| CN219798478U (en) | Liquid level measurement assembly | |
| CN217765351U (en) | Ionization vacuum transmitter detection device | |
| CN215065030U (en) | Static pressure characteristic testing device of differential pressure transmitter | |
| CN114483301B (en) | Simple gas engine jet rule measuring method | |
| CN219284571U (en) | Dynamic explosion pressure verification device of explosion-proof test system | |
| McKee | Pulsation effects on orifice metering considering primary and secondary elements | |
| CN114858349A (en) | Resistance vacuum transmitter detection device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |