CN203396461U - Differential pressure flowmeter verification system - Google Patents
Differential pressure flowmeter verification system Download PDFInfo
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- CN203396461U CN203396461U CN201320509756.XU CN201320509756U CN203396461U CN 203396461 U CN203396461 U CN 203396461U CN 201320509756 U CN201320509756 U CN 201320509756U CN 203396461 U CN203396461 U CN 203396461U
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- differential pressure
- hart
- verification system
- industrial computer
- pressure flowmeter
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Abstract
The utility model provides a differential pressure flowmeter verification system, in order to solve the problems such as big verification errors resulting from the calculation errors of the instantaneous flow rate and output current value of a verification meter transmitter, the hardware error of a current-voltage switching circuit and the sampling resolution error of an AD (Analogue-Digital) module of the differential pressure flowmeter verification system in the prior art. The verification system provided by the utility model comprises an industrial computer, an electromagnetic flowmeter standard instrument, an HART (Highway Addressable Remote Transducer) and an RS232 (Recommend Standard 232) transducer, wherein one end of the HART is connected with the industrial computer, while the other end of the HART is connected with the built-in HART interface of a to-be-verified differential pressure flowmeter transmitter; one end of the RS232 transducer is connected with the built-in RS232 data interface of the electromagnetic flowmeter standard instrument, and the other end of the RS232 transducer is connected with the industrial computer. The verification system provided by the utility model has the beneficial effect of avoiding the calculation errors of the instantaneous flow rate and output current value of the verification meter transmitter, the hardware error of the current-voltage switching circuit, and the sampling resolution error of the AD module, so that the verification accuracy and the correctness are enhanced.
Description
Invention field
The utility model relates to differential pressure flowmeter Calibration Technology, specially refers to a kind of differential pressure flowmeter verification system.
Background technology
Prior art differential pressure flowmeter verification system is the differential pressure value that the current output signal for the treatment of the 4-20mA of calibrating differential pressure flowmeter (being designated hereinafter simply as calibrating table) transmitter output by voltage signal acquisition integrating instrument gathered and calculated to obtain calibrating table.Its detailed process is that the current signal that voltage signal acquisition integrating instrument is shown transmitter output by a current-to-voltage converting circuit by calibrating is converted to voltage signal, then, the analog-to-digital conversion module AD(built-in by voltage signal acquisition integrating instrument is designated hereinafter simply as AD module) voltage signal is converted to digital signal, by algorithm process, can obtain the current differential pressure value of calibrating table again.The instantaneous delivery value of the differential pressure value of the calibrating table detecting and the standard deviation pressure type flowmeter in calibration system is compared, by repeatedly identical test, can obtain demarcating the calibrating data such as the required linearity, reproducibility error and efflux coefficient.But because calibrating table transmitter exists the error of calculation when processing instantaneous delivery and output current value, the current value of differential pressure galvanometer output is also not exclusively directly proportional to its instantaneous delivery, may cause gauging error thus.Again due to the hardware error of calibrating being shown to the current signal of transmitter output and being converted to the current-to-voltage converting circuit of voltage signal and exist, and the caused error of AD module samples resolution, gauging error further increased.In addition, need testing person manually to input each parameter and data in computation sheet in verification process,, also easily there is misoperation in trivial operations not only, thereby cause verification result mistake.Obviously, prior art differential pressure flowmeter verification system exists calibrating table transmitter instantaneous delivery and the error of calculation of output current value, the hardware error of current-to-voltage converting circuit and AD module samples Resolution Error, thereby causes the problems such as gauging error is larger.
Summary of the invention
For overcoming calibrating table transmitter instantaneous delivery that prior art differential pressure flowmeter verification system exists and the error of calculation of output current value, the hardware error of current-to-voltage converting circuit and AD module samples Resolution Error, thereby cause the problems such as gauging error is larger, the utility model proposes a kind of differential pressure flowmeter verification system.The utility model differential pressure flowmeter verification system comprises industrial computer, electromagnetic flowmeter standard scale, HART converter and RS232 converter; One end of HART converter connects industrial computer, and the other end connects the built-in HART interface of differential pressure flowmeter transmitter to be examined and determine; One end of RS232 converter connects the RS232 data-interface that electromagnetic flowmeter standard scale carries, and the other end connects industrial computer and connects; Described HART converter is highway addressable remote transducer communication protocol HART converter, and the HART agreement physical signalling that differential pressure flowmeter to be examined and determine can be used and the RS232 serial signal of industrial computer are changed mutually.
The useful technique effect of the utility model differential pressure flowmeter verification system is to have avoided calibrating table transmitter instantaneous delivery that verification system exists and the error of calculation of output current value, the hardware error of current-to-voltage converting circuit and AD module samples Resolution Error, thereby has improved calibration accuracy and accuracy.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation of the utility model differential pressure flowmeter verification system.
Below in conjunction with drawings and the specific embodiments, the utility model differential pressure flowmeter verification system is further described.
Embodiment
Accompanying drawing 1 is the structural representation of the utility model differential pressure flowmeter verification system.As seen from the figure, the utility model differential pressure flowmeter verification system comprises industrial computer, electromagnetic flowmeter standard scale, HART converter and RS232 converter; One end of HART converter connects industrial computer, and the other end connects the built-in HART interface of differential pressure flowmeter transmitter to be examined and determine; One end of RS232 converter connects the RS232 data-interface that electromagnetic flowmeter standard scale carries, and the other end connects industrial computer and connects; Described HART converter is highway addressable remote transducer communication protocol HART converter, and the HART agreement physical signalling that differential pressure flowmeter to be examined and determine can be used and the RS232 serial signal of industrial computer are changed mutually.The utility model differential pressure flowmeter verification system adopts HART converter to set up information interaction between differential pressure flowmeter to be examined and determine and industrial computer, differential pressure flowmeter transmitter can, directly from built-in HART interface output parameters or real time data, can directly read differential pressure value from the HART interface of differential pressure flowmeter transmitter to be examined and determine.Thereby effectively avoided from gathering wait examining and determine differential pressure flowmeter hardware error and the caused error of AD module samples resolution that current signal detects the error of calculation that brought calibrating table transmitter exists when processing instantaneous delivery and output current value, current signal that calibrating is shown to transmitter output is converted to voltage signal current-to-voltage converting circuit exists, thereby effectively improved calibration accuracy and the accuracy of verification system.
The utility model differential pressure flowmeter verification system can be at the built-in data acquisition computing system of industrial computer, and will differential pressure flowmeter be examined and determine and electromagnetic flowmeter standard scale be connected in series on pipeline, after regulating pipeline flow value, gather the differential pressure value of differential pressure flowmeter to be examined and determine and the aggregate-value of electromagnetic flowmeter standard scale that each sets calibrational capacity point, and carry out error calculating, after all flow points have been demarcated, just can calculate verification result data, comprise efflux coefficient, the linearity, repeatability, the COEFFICIENT K of reflected measurement Media density and differential pressure value relation and uncertainty etc.Thus.Reduce manual operation error, avoided the impact of human factor.
Obviously, the useful technique effect of the utility model differential pressure flowmeter verification system is to have avoided calibrating table transmitter instantaneous delivery that verification system exists and the error of calculation of output current value, the hardware error of current-to-voltage converting circuit and AD module samples Resolution Error, thereby has improved calibration accuracy and accuracy.
Claims (1)
1. a differential pressure flowmeter verification system, is characterized in that: this system comprises industrial computer, electromagnetic flowmeter standard scale, HART converter and RS232 converter; One end of HART converter connects industrial computer, and the other end connects the built-in HART interface of differential pressure flowmeter transmitter to be examined and determine; One end of RS232 converter connects the RS232 data-interface that electromagnetic flowmeter standard scale carries, and the other end connects industrial computer and connects; Described HART converter is highway addressable remote transducer communication protocol HART converter, and the HART agreement physical signalling that differential pressure flowmeter to be examined and determine can be used and the RS232 serial signal of industrial computer are changed mutually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320509756.XU CN203396461U (en) | 2013-08-21 | 2013-08-21 | Differential pressure flowmeter verification system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320509756.XU CN203396461U (en) | 2013-08-21 | 2013-08-21 | Differential pressure flowmeter verification system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203396461U true CN203396461U (en) | 2014-01-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320509756.XU Expired - Lifetime CN203396461U (en) | 2013-08-21 | 2013-08-21 | Differential pressure flowmeter verification system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203396461U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105181040A (en) * | 2015-09-25 | 2015-12-23 | 辽宁聚焦科技有限公司 | Method for digitized calibration and optimization of difference pressure flow meter |
-
2013
- 2013-08-21 CN CN201320509756.XU patent/CN203396461U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105181040A (en) * | 2015-09-25 | 2015-12-23 | 辽宁聚焦科技有限公司 | Method for digitized calibration and optimization of difference pressure flow meter |
| CN105181040B (en) * | 2015-09-25 | 2018-10-23 | 辽宁聚焦科技有限公司 | A kind of digitalized calibration and optimization method of differential pressure flowmeter |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140115 |
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| CX01 | Expiry of patent term |