CN104019850A - Method for measuring volume flow rate of fluid - Google Patents
Method for measuring volume flow rate of fluid Download PDFInfo
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- CN104019850A CN104019850A CN201310065677.9A CN201310065677A CN104019850A CN 104019850 A CN104019850 A CN 104019850A CN 201310065677 A CN201310065677 A CN 201310065677A CN 104019850 A CN104019850 A CN 104019850A
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Abstract
The invention discloses a method for measuring the volume flow rate of fluid. The method comprises the steps that 4 m-20 m ADC feedback is adopted in measurement signal input and zero correction and full-scale correction are conducted on each channel with a programming method, wherein measurement signals comprise a flow signal, a pressure signal and a temperature signal; a PLC programming language is used for calculation of compensation and the actual flow rate is worked out; cyclic interruption is adopted for conducting iteration accumulation on the instantaneous flow rate, clock correction parameters are introduced, and an iteration value is corrected; it is guaranteed that the accuracy is not reduced in the accumulation process through floating point removal and reservation and data format conversion; the accumulation accuracy is guaranteed with a compound accumulation output method, an upper limit zero clearing method and a metering method. According to the method, the data conversion accuracy is guaranteed through a high-accuracy signal input template, each sampling channel is corrected with the programming method, and the data accuracy is guaranteed; clock compensation, a guarantee of data accumulation accuracy and the like are achieved with the programming method; finally, accurate measurement of the volume flow rate is achieved.
Description
Technical field:
The invention belongs to automation field, be specifically related to a kind of assay method for fluid volume flow.
Background technology:
Traditional fluid volume flow mensuration mode is flow detector+flow measuring instrument (secondary instrument), and wherein: pick-up unit is responsible for the detection of flow instantaneous amount signal, flow measuring instrument is responsible for signal cycle accumulation function.Development along with PLC and DCS system, in increasing control scene and control program, all do not adopt secondary instrument, and adopt flow detector signal directly to enter the mode of PLC or DCS system, how to guarantee fluid flow accurately detect and cumulative amount accumulation just becomes key.
Summary of the invention:
In order to realize the Accurate Measurement of fluid volume flow, the present invention proposes following technical scheme:
An assay method for fluid volume flow, its detection signal input all adopts 4 ~ 20mADC feedback, and by programmed method to each passage carry out zero point, full scale is proofreaied and correct, described detection signal comprises flow, pressure, temperature signal; Use PLC programming language to compensate calculating, calculate actual flow; Use cycle interruption to carry out iteration accumulation to instantaneous delivery, and introduce clock check and correction parameter, iterative value is revised; Use that floating-point excision retains, Data Format Transform guarantees that accumulation precision do not lose; Adopt synthetic accumulation output, upper limit zero clearing, note time method to guarantee to accumulate precision.
The present invention is usingd PLC as calculating core, adopts traditional detection of gas flow rate device detection volume flow.
Utilize PLC to gather the data of instantaneous flow rate signal, and by programmed method, solve the accumulation precision problem of calibration measurements system and flow signal, thereby realize the mensuration of volumetric flow rate.
The present invention, by flow detecting signal and flow-compensated signal (temperature, pressure) access PLC template, realizes signal calibration by programmed method, flow signal accumulation.Flow detection and pressure, the output of temperature-detecting device compensating signal all adopt 4 ~ 20mA standard signal.Use PLC to substitute traditional secondary analyzer needing the problem of main concern is that A/D transforms accuracy guarantee and accumulation clock accuracy problem.
In the present invention, use 16 analogue input templates of Siemens (6ES7 331-7NF10-0AB0), CPU adopts (6ES7 315-2AG10-0AB0).By programmed method, realizing correction, the instantaneous delivery of measuring system measures, and (in reality, the sampling period is 100ms to utilize PLC Interruption, scan round and introducing clock correction to realize the accumulation of input signal iteration, be better than the 1s sampling period in traditional secondary analyzer), thereby realize signal, accurately accumulate; Final all parameter displays, in HMI interface, facilitate that authorized person checks online, adjustment and periodic calibration.
The invention has the beneficial effects as follows:
1, by using this method to realize the visualized management of all kinds of parameters, and online system is calibrated.
2, by programmed method, realize the accumulation iteration of flow, and guarantee to accumulate precision, meet relevant regulations, standard, substitute secondary analyzer.
Accompanying drawing explanation
Fig. 1 is signals collecting process flow diagram of the present invention.
Embodiment
As shown in Figure 1, during programming:
1. pair every channel measurement data are carried out accuracy correction programming, comprise zero point, full scale in 5 interior point Linearizations processing; And passage call number is set, facilitate every channel correcting, man-machine interface (HMI) inquiry, set.
2. according to volumetric flow rate formula, carry out public subroutine program, and will reserve design temperature, design pressure, whether selection pressure compensation, whether select the input parameters such as temperature compensation, flow correction k-factor; Reserved: the output parameters such as working condition pressure, working temperature, actual flow; And flow call number is set, facilitate man-machine interface (HMI) parameter query, setting.
3. use cycle interruption to carry out iteration accumulation to instantaneous delivery, and introduce clock correction parameter, iterative value is revised; For guaranteeing accumulation precision, while measuring in operational process, use floating number form, during super upper limit set value, retain fraction part iteration next time, integral part moves to the storage of lint-long integer form, the data zero clearing upper limit is set, and remembers zero clearing number of times; Final synthetic delivery rate accumulated value, prevents data from overflow and loss of significance.
Implementation step is:
1. use standard signal generating means, each passage of template is proofreaied and correct.
2. the corresponding instrument parameter of each flow is set in HMI: design temperature, design pressure, whether selection pressure compensation, whether select temperature compensation, flow correction k-factor etc., and demarcate clock correction factor.
3. access actual flow instrumentation, pressure, temperature instrument, realize data monitoring and data accumulative total.
Oxygen, argon gas, nitrogen flow that the present embodiment stands for a long time in bis-valve stations of AOD, Quan Xing Stainless Steel Plant, Shandong, Huzhou in the newly-built 2#AOD stove of Special Steel Works are all applied in measuring, respond well.
Claims (1)
1. an assay method for fluid volume flow, its detection signal input all adopts 4 ~ 20mADC feedback, and by programmed method to each passage carry out zero point, full scale is proofreaied and correct, described detection signal comprises flow, pressure, temperature signal; Use PLC programming language to compensate calculating, calculate actual flow; Use cycle interruption to carry out iteration accumulation to instantaneous delivery, and introduce clock check and correction parameter, iterative value is revised; Use that floating-point excision retains, Data Format Transform guarantees that accumulation precision do not lose; Adopt synthetic accumulation output, upper limit zero clearing, note time method to guarantee to accumulate precision.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310065677.9A CN104019850A (en) | 2013-03-02 | 2013-03-02 | Method for measuring volume flow rate of fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310065677.9A CN104019850A (en) | 2013-03-02 | 2013-03-02 | Method for measuring volume flow rate of fluid |
Publications (1)
| Publication Number | Publication Date |
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| CN104019850A true CN104019850A (en) | 2014-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310065677.9A Pending CN104019850A (en) | 2013-03-02 | 2013-03-02 | Method for measuring volume flow rate of fluid |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1268659A (en) * | 2000-04-30 | 2000-10-04 | 合肥工业大学 | Ke's mass flowmeter digital signal processing system |
| CN101299767A (en) * | 2008-05-07 | 2008-11-05 | 珠海欧比特控制工程股份有限公司 | System and method for calculating flow |
| CN101706299A (en) * | 2009-11-20 | 2010-05-12 | 合肥工业大学 | Coriolis mass flow transmitter based on DSP |
| CN201740555U (en) * | 2009-08-05 | 2011-02-09 | 北京博思达新世纪测控技术有限公司 | Flow calculation conversion unit |
| US20110185820A1 (en) * | 2002-03-29 | 2011-08-04 | Invensys Systems, Inc. | Startup techniques for a digital flowmeter |
-
2013
- 2013-03-02 CN CN201310065677.9A patent/CN104019850A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1268659A (en) * | 2000-04-30 | 2000-10-04 | 合肥工业大学 | Ke's mass flowmeter digital signal processing system |
| US20110185820A1 (en) * | 2002-03-29 | 2011-08-04 | Invensys Systems, Inc. | Startup techniques for a digital flowmeter |
| CN101299767A (en) * | 2008-05-07 | 2008-11-05 | 珠海欧比特控制工程股份有限公司 | System and method for calculating flow |
| CN201740555U (en) * | 2009-08-05 | 2011-02-09 | 北京博思达新世纪测控技术有限公司 | Flow calculation conversion unit |
| CN101706299A (en) * | 2009-11-20 | 2010-05-12 | 合肥工业大学 | Coriolis mass flow transmitter based on DSP |
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Application publication date: 20140903 |