CN102928157B - Calibration system and method for pressure sensor of flow integrator - Google Patents

Calibration system and method for pressure sensor of flow integrator Download PDF

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Publication number
CN102928157B
CN102928157B CN201210437146.3A CN201210437146A CN102928157B CN 102928157 B CN102928157 B CN 102928157B CN 201210437146 A CN201210437146 A CN 201210437146A CN 102928157 B CN102928157 B CN 102928157B
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pressure
pressure transducer
force value
flow integrator
mainboard
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CN102928157A (en
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刘勋
赵勇
雷新民
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Chengdu Qianjia Technology Co Ltd
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Chengdu Qianjia Technology Co Ltd
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Abstract

The invention discloses a calibration system for a pressure sensor of a flow integrator. The calibration system for the pressure sensor of the flow integrator comprises the flow integrator, wherein the flow integrator is connected with the pressure sensor, the pressure sensor is connected with a pressure source, the pressure source is connected with a pressure gage, the pressure source and the pressure gage are both connected with an upper computer, and the upper computer is connected with the flow integrator. The calibration system is provided with the upper computer which achieves calculating and inputting of data needed to be input into the flow integrator, manual operation is not needed, intelligentized calibration is achieved, inaccurate calibration caused by manual display data observing and data calculating errors is avoided, troubles of manual data inputting by using tiny buttons are removed, and work efficiency is improved.

Description

A kind of calibration system of pressure sensor of flow integrator and method
Technical field
The present invention relates to the calibration technique field of flow integrator, particularly a kind of pressure sensor of flow integrator calibration system and use this system to realize the method for the demarcation of pressure sensor of flow integrator.
Background technology
Flowmeter is for requisite equipment of consumption such as metering liquid, steam, rock gases.Flowmeter is generally made up of base table, various sensor (as pressure transducer, temperature sensor, speed probe etc.) and the flow integrator that carries out final flow accumulation.In order to improve the performance index such as the precision of flow integrator, flowmeter in exploitation, install, all need configuration and calibration sensor curve of output in the process of periodic calibration and replacing.Prior art is in the demarcation and layoutprocedure of pressure transducer, and usually adopt artificial method of demarcating to carry out demarcating and configuring, calibration system comprises flow integrator, pressure transducer, Manual pressure source and tensimeter.Staff is pressure source manually, pressure is adjusted to the force value of demarcating needed for each calibration point of pressure transducer, the force value that pressure transducer receives by flow integrator shows on flow integrator display, difference between staff's calculating pressure table and display, and by the storer of the button on flow integrator by manual for this difference input flow rate integrating instrument, when gas consumption is measured, flow integrator adds this difference, automatically to reduce measuring error.Because indicator screen is little, and be section formula, easily cause malobservation and then cause demarcation inaccurate.In addition, the load button of flow integrator is little, not easy to operate, and each point more (being generally 5-7 point) demarcated, and needs to carry out trace and flyback demarcation, and artificial efficiency of demarcating is low.
Summary of the invention
Artificial demarcation existing for the object of the invention is to overcome in prior art easily makes mistakes, inefficient deficiency, and provide a kind of calibration system of pressure sensor of flow integrator, this system can improve pressure sensor calibrating accuracy rate and work efficiency.
In order to realize foregoing invention object, the invention provides following technical scheme:
A calibration system for pressure sensor of flow integrator, comprises flow integrator, and described flow integrator is connected with pressure transducer, described pressure transducer Bonding pressure source, described pressure source Bonding pressure table, described tensimeter is connected with host computer, and described host computer is connected with flow integrator.
The calibration system of inventive flow integrating instrument pressure transducer, employs host computer, utilizes host computer to carry out data calculating, not easily makes mistakes, and send data to flow integrator by host computer, without the need to manual operation, not easily make mistakes, and work efficiency is high.
Preferably, described flow integrator comprises mainboard and pressure transducer preprocessor, described mainboard is provided with pressure transducer preprocessor general-purpose interface, described pressure transducer preprocessor is connected with mainboard by described general-purpose interface, described pressure transducer preprocessor is connected with pressure transducer, and described host computer is connected with mainboard.
In order to cost-saving, the base table of a general configurable different principle of flow integrator, as the orifice flow base table based on differential pressure principle, based on the turbine, snail street, precession vortex base table etc. of velocity principle.The pressure transducer preprocessor of configuration is fixedly welded on mainboard by traditional flow integrator usually, and timing signal is demarcated each pressure transducer respectively by the pressure transducer preprocessor on mainboard.Because the curve of output of each pressure transducer is different, timing signal is easily made mistakes, and pressure transducer preprocessor is fixedly welded on mainboard, increases the physical dimension of mainboard.The present invention is independent from mainboard by pressure transducer preprocessor, pressure transducer preprocessor realizes being connected with mainboard by the general-purpose interface on mainboard, timing signal only needs the pressure transducer preprocessor of pressure transducer to be calibrated to be connected with mainboard, after demarcation completes, change another pressure transducer preprocessor and corresponding pressure transducer thereof, just complete the demarcation of another pressure transducer preprocessor and corresponding pressure transducer thereof fast, demarcate and not easily make mistakes, and add the applicability of mainboard, reduce mainboard structure.
Preferably, described general-purpose interface is I 2c bus interface.
Present invention also offers a kind of method using above-mentioned calibration system to realize pressure calibration, it comprises step:
Step 1: regulated pressure source, makes the pressure of pressure transducer pressure calibration point be required force value of demarcating;
Step 2: the difference between the force value that host computer calculating pressure table and pressure transducer receive, and by described RS485 bus transfer to described flow integrator.
In described step 1, regulated pressure source, makes the pressure of pressure transducer pressure calibration point be the method for required force value of demarcating to be:
Described pressure calibration is multiple, and carry out trace force value timing signal, regulated pressure source, force value is changed from small to big, and makes the pressure of each calibration point of pressure transducer be required force value of demarcating;
Carry out the demarcation of flyback force value, regulated pressure source, force value from large to small, makes the pressure of each calibration point of pressure transducer be required force value of demarcating.
Host computer calculates the trace error of each pressure calibration point and the mean value of flyback error, and by 485 buses, this mean value is transferred to flow integrator.
compared with prior art, beneficial effect of the present invention: inventive flow integrating instrument pressure sensor calibration system, be provided with host computer, realize needing the data in input flow rate integrating instrument to calculate and input by host computer, without the need to manual operation, realize intelligent demarcation, avoid the demarcation caused because of manual observation display data and calculating error in data inaccurate, it also avoid the trouble using tiny button manual input data to bring, improve work efficiency.
Accompanying drawing illustrates:
Fig. 1 is the structured flowchart of amount integrating instrument pressure sensor calibration system of the present invention in embodiment 2.
Fig. 2 uses inventive flow integrating instrument pressure sensor calibration system to carry out the process flow diagram demarcated.
Embodiment
Below in conjunction with test example and embodiment, the present invention is described in further detail.But this should be interpreted as that the scope of the above-mentioned theme of the present invention is only limitted to following embodiment, all technology realized based on content of the present invention all belong to scope of the present invention.
Embodiment 1
The calibration system of the pressure sensor of flow integrator that the present embodiment provides, comprise flow integrator, described flow integrator is connected with pressure transducer, described pressure transducer Bonding pressure calibration facility, described pressure calibration equipment comprises pressure source and tensimeter, pressure transducer Bonding pressure source, described pressure source Bonding pressure table, described pressure source is all connected with host computer by RS232 with tensimeter, and described host computer is connected with flow integrator by RS485 bus.
The calibration system of the pressure sensor of flow integrator using the present embodiment to enumerate, timing signal is carried out to pressure transducer, regulated pressure source, the pressure of each calibration point of pressure transducer is made to be required force value of demarcating, difference between the force value that host computer calculating pressure table and pressure transducer receive, and by RS485 bus transfer to the eeprom memory of flow integrator, can automatic Calibration be realized, without the need to manual operation, efficiency is high.Compared with demarcating with traditional craft, the calibration system of inventive flow integrating instrument pressure transducer is used to demarcate, it is undertaken by host computer that data calculate, without the need to artificial calculating, it also avoid and check the data that display shows and the read untrue caused is inaccurate with calculating, avoid the situation of demarcating mistake.By present system, it also avoid and carry out data input by the button on flow integrator, improve work efficiency, it also avoid the trouble of action button.
In addition, by Configuration Manager in host computer, the data recording each pressure transducer can be convenient to, and realization unification manages efficiently, improves the dirigibility of demarcation and configuration, integrality, tightness and diagnosis efficiency.Adapted to the tomorrow requirement of flow integrator, the sustainable pressure transducer to different manufacturers and different model carry out complete, demarcate rapidly.
Embodiment 2
With reference to figure 1, the calibration system of the pressure sensor of flow integrator that the present embodiment provides, comprise flow integrator, described flow integrator is connected with pressure transducer, described pressure transducer Bonding pressure source, described pressure source Bonding pressure table, described pressure source is all connected with host computer by RS232 with tensimeter, and described host computer is connected with flow integrator by RS485 bus.
Described flow integrator comprises mainboard, pressure transducer preprocessor and liquid crystal display, eeprom memory is provided with in described pressure transducer preprocessor, described mainboard is provided with pressure transducer preprocessor general-purpose interface, described pressure transducer preprocessor is connected with mainboard by described general-purpose interface, and described general-purpose interface is I 2c bus interface, mainboard is electrically connected with liquid crystal display, and described pressure transducer preprocessor is connected with pressure transducer, and described host computer is connected with mainboard with by RS485 bus.
In order to cost-saving, the base table of a general configurable different principle of flow integrator, as the orifice flow base table based on differential pressure principle, based on the turbine, snail street, precession vortex base table etc. of velocity principle, normally the pressure transducer preprocessor of configuration is fixedly welded on mainboard.The producer of the pressure transducer that each flowmeter base table uses, specification and model are all different, even if the parameters such as the sensor output curve of the pressure transducer of same producer same batch of same model are also different, to demarcate for each pressure transducer.Because the curve of output of each pressure transducer is different, timing signal is easily made mistakes.The present invention is by independent from mainboard for each pressure transducer preprocessor, each pressure transducer preprocessor realizes being connected with mainboard by the general-purpose interface on mainboard, timing signal only needs the pressure transducer preprocessor of pressure transducer to be calibrated to be connected with mainboard, after demarcation completes, change another pressure transducer preprocessor and corresponding pressure transducer thereof, just complete the demarcation of another pressure transducer preprocessor and corresponding pressure transducer thereof fast, demarcate and not easily make mistakes, and add the applicability of mainboard, reduce mainboard structure.
With reference to figure 2, use the calibration system of inventive flow integrating instrument pressure transducer to demarcate pressure transducer, its method is:
Step 1: regulated pressure source, force value is changed from small to big, and pointwise is demarcated, and makes the pressure of each calibration point of pressure transducer be required force value of demarcating, namely carries out the demarcation of trace force value.The ascending pointwise of force value is demarcated, and is conducive to reducing error, improves stated accuracy.
Step 2: the difference between the force value that host computer calculating pressure table and pressure transducer receive, and this difference is inputed to the mainboard of flow integrator by RS485 bus.
Step 3: judge that trace force value is demarcated and whether complete, if yes then enter step 4, otherwise return step 1.
Step 4: regulated pressure source, force value is diminished by size, makes the pressure of each calibration point of pressure transducer be required force value of demarcating, namely carries out the demarcation of flyback force value.
Step 5: the difference between the force value that host computer calculating pressure table and pressure transducer receive, and this difference is entered mainboard to flow integrator by RS485 bus.
Step 6: judge that flyback force value is demarcated and whether complete, if yes then enter step 7, otherwise return step 4.
Step 7: calculate the trace error of each pressure calibration point and the mean value of flyback error, and by 485 bus transfer to mainboard, then pass through I 2c bus is stored in eeprom memory, completes demarcation and the configuration of pressure transducer.Calculate the mean value of trace error and flyback error, be conducive to reducing measuring error.

Claims (2)

1. the calibration system of a pressure sensor of flow integrator, comprise flow integrator, described flow integrator is connected with pressure transducer, described pressure transducer Bonding pressure source, described pressure source Bonding pressure table, it is characterized in that, described pressure source is all connected with host computer with tensimeter, and described host computer is connected with flow integrator; Difference between the force value that described host computer calculating pressure table and pressure transducer receive, and by RS485 bus transfer to described flow integrator; Described flow integrator comprises mainboard and pressure transducer preprocessor, described mainboard is provided with pressure transducer preprocessor general-purpose interface, described pressure transducer preprocessor is connected with mainboard by described general-purpose interface, described pressure transducer preprocessor is connected with pressure transducer, and described host computer is connected with mainboard; Described general-purpose interface is I 2c bus interface; Described calibration system carries out timing signal to pressure transducer, regulated pressure source, the pressure of each calibration point of pressure transducer is made to be required force value of demarcating, difference between the force value that host computer calculating pressure table and pressure transducer receive, and pass through the eeprom memory of RS485 bus transfer to flow integrator; Difference between described force value is the mean value of the force value trace error of changing from small to big and force value flyback error from large to small.
2. use the calibration system of the pressure sensor of flow integrator described in claim 1 to realize the method for pressure calibration, it is characterized in that, comprise the following steps:
Step 1: regulated pressure source, force value pointwise of changing from small to big is demarcated, and makes the pressure of each calibration point of pressure transducer be required force value of demarcating, namely carries out the demarcation of trace force value;
Step 2: the difference between the force value that host computer calculating pressure table and pressure transducer receive, and this difference is inputed to the mainboard of flow integrator by RS485 bus;
Step 3: judge that trace force value is demarcated and whether complete, if yes then enter step 4, otherwise return step 1;
Step 4: regulated pressure source, force value from large to small, makes the pressure of each calibration point of pressure transducer be required force value of demarcating, namely carries out the demarcation of flyback force value;
Step 5: the difference between the force value that host computer calculating pressure table and pressure transducer receive, and this difference is entered mainboard to flow integrator by RS485 bus;
Step 6: judge that flyback force value is demarcated and whether complete, if yes then enter step 7, otherwise return step 4;
Step 7: calculate the trace error of each pressure calibration point and the mean value of flyback error, and by 485 bus transfer to mainboard, then be stored in eeprom memory by I2C bus, complete demarcation and the configuration of pressure transducer.
CN201210437146.3A 2012-11-06 2012-11-06 Calibration system and method for pressure sensor of flow integrator Active CN102928157B (en)

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