CN111157081B - Calibration method of electronic gas meter - Google Patents

Calibration method of electronic gas meter Download PDF

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Publication number
CN111157081B
CN111157081B CN201911364788.3A CN201911364788A CN111157081B CN 111157081 B CN111157081 B CN 111157081B CN 201911364788 A CN201911364788 A CN 201911364788A CN 111157081 B CN111157081 B CN 111157081B
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calibration
gas
gas meter
correction list
gas meters
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CN111157081A (en
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林上玉
陈志华
钭伟明
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Goldcard Smart Group Co Ltd
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Goldcard Smart Group Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F25/00Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G01F25/10Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
    • G01F25/15Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters specially adapted for gas meters

Abstract

The invention discloses a calibration method of an electronic gas meter, belonging to the technical field of gas meters. The calibration equipment can calibrate all the gas meters corresponding to all the flow detection points at one time, and the calibration efficiency is improved. The correction list can be checked between the gas meter and the calibration equipment, so that the correctness of the correction list written into the gas meter is effectively guaranteed, and the accuracy of the calibration of the gas meter is improved. And after the initial calibration is finished, each gas meter is subjected to re-calibration, so that the calibration accuracy is further improved, and the qualified rate of the calibrated gas meters is ensured.

Description

Calibration method of electronic gas meter
Technical Field
The invention relates to the technical field of gas meters, in particular to a calibration method of an electronic gas meter.
Background
With the continuous development of the gas industry, gas metering also becomes more important, and the electronic gas meter is rapidly applied to the field of gas metering with the advantages of high precision, low noise and the like. Since the reading of the gas meter is the only evidence for measuring the gas cost, the accuracy and reliability thereof are particularly important. The electronic gas meter relies on the sensor to measure, and due to the characteristics of the sensor, the sensor has certain errors during measurement, and the sampling precision requirement can be met only after the sensor needs to be calibrated before delivery. However, the existing method for calibrating the error of the electronic gas meter has the defects of low meter calibration efficiency, long period, instability, low accuracy and the like, and the calibration yield is low, so that the calibration requirement cannot be well met.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention provides the calibration method of the electronic gas meter, which effectively improves the calibration efficiency and accuracy of the electronic gas meter.
In order to achieve the above technical object, the calibration method of an electronic gas meter provided by the present invention comprises the following steps,
step S100, the calibration equipment obtains respective first metering error values of all the gas meters corresponding to all the flow detection points according to the configured flow detection points, and then step S200 is carried out;
step S200, firstly, generating error curve data of each gas meter by the calibration equipment according to the first metering error value of each gas meter in the step S100, then calling a metering module intermediate library to generate a correction list of each gas meter according to the error curve data, and then performing the step S300;
step S300, the calibration equipment sends the correction lists generated in the step S200 to corresponding gas meters one by one, each gas meter checks the received correction list, if the correction list is correct, the gas meters store the correction list and feed back the stored correction list to the calibration equipment, if the correction list is wrong, the gas meters feed back wrong response or no response to the calibration equipment, the calibration equipment judges whether the correction list fed back by the gas meters is consistent with the correction list sent to the gas meters or not according to the correction list fed back by the gas meters, if the correction list is inconsistent or the gas meters feed back the wrong response or the gas meters do not respond, the calibration equipment sends the correction list to the gas meters again until the correction list fed back by each gas meter is consistent with the correction list sent to the gas meters by the calibration equipment or the correction list is sent to the same gas meters again for a certain number of times, and then step S400 is carried out;
step S400, all the gas meters are subjected to re-calibration, the calibration equipment obtains respective second metering error values of all the gas meters corresponding to all the flow detection points according to the configured flow detection points, the calibration equipment judges whether the second metering error values of all the gas meters are in a qualified range, if yes, the gas meters are qualified, and if not, the gas meters are judged to be unqualified.
Preferably, in step S100, the calibration device obtains first measurement error values of the multiple gas meters corresponding to each flow detection point one by one according to the sequence of the flow detection points.
Preferably, the calibration device sends an instantaneous flow reading command to a plurality of gas meters corresponding to the same flow detection point at the same time in a detection period, the gas meters feed back the current instantaneous flow value to the calibration device after receiving the reading command, and the calibration device receives and stores the instantaneous flow value fed back by each gas meter.
Preferably, the calibration device stores the reference flow value detected by the calibration device while storing the instantaneous flow value fed back by each gas meter.
Preferably, the calibration device calculates a flow average value of each gas meter according to a plurality of instantaneous flow values fed back by each gas meter in a detection period, and then calculates the flow average value of each gas meter with a reference flow value to obtain a first measurement error value of each gas meter.
Preferably, in step S300, the gas meter checks the check bit and format of the correction list sent by the calibration device, stores the correction list if both are correct, and feeds back an error response or no response to the calibration device if either is wrong.
Preferably, the second metering error value is obtained in the same manner as the first metering error value.
Preferably, before starting the step S100, the gas meters are subjected to the tightness detection and the pre-operation.
Preferably, the calibration equipment and each gas meter realize two-way communication through infrared wireless communication, USB communication or COM communication.
Preferably, the calibration device is provided with a display, and the first metering error value and the second metering error value are sequentially displayed on the display.
After the technical scheme is adopted, the invention has the following advantages:
1. according to the calibration method of the electronic gas meter, calibration equipment generates a correction list of each gas meter according to a first metering error value of each gas meter, writes the correction list into the gas meter to complete initial calibration, and then performs re-calibration on the gas meter. The calibration equipment can calibrate all the gas meters corresponding to all the flow detection points at one time, and the calibration efficiency is improved. The correction list can be checked between the gas meter and the calibration equipment, so that the correctness of the correction list written into the gas meter is effectively guaranteed, and the accuracy of the calibration of the gas meter is improved. And after the initial calibration is finished, each gas meter is subjected to re-calibration, so that the calibration accuracy is further improved, and the qualified rate of the calibrated gas meters is ensured.
2. In the detection period, the calibration equipment simultaneously sends a command for reading instantaneous flow to a plurality of gas meters corresponding to the same flow detection point, so that the time for obtaining the two-time measurement error value of each gas meter is greatly shortened, the calibration period is favorably shortened, and the calibration efficiency is favorably improved.
3. During calibration, the flow of the gas tends to be stable, the reference flow value detected by the calibration equipment tends to be a fixed value, and the flow average value of the instantaneous flow value fed back by each gas meter in the detection period is compared with the reference flow value to obtain a measurement error value.
4. The gas meter checks the check position and format of the correction list, the correction list is stored only when the check is correct, and if any one of the check is correct, the gas meter feeds back an error response or no response, so that the correctness and safety of the correction list written into the gas meter are ensured, and the accuracy of calibration is improved.
5. Before calibration is started, the tightness of each gas meter is detected, and the hardware structure of each gas meter is ensured to meet the factory requirements. And then pre-operation is carried out, so that the gas flow flowing through the gas meter is stable, and the condition that the calibration purpose cannot be finished due to a large measurement error value caused by large gas flow fluctuation is avoided.
Drawings
FIG. 1 is a schematic flow chart of a calibration method according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a step S100 of a calibration method according to an embodiment of the invention;
FIG. 3 is a flow chart illustrating a process of performing an initial calibration on a gas meter in a calibration method according to an embodiment of the invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Example one
As shown in fig. 1 to fig. 3, a calibration method for an electronic gas meter according to an embodiment of the present invention includes the following steps,
step S100, the calibration equipment obtains respective first metering error values of all the gas meters corresponding to all the flow detection points according to the configured flow detection points, and then step S200 is carried out;
step S200, firstly, generating error curve data of each gas meter by the calibration equipment according to the first metering error value of each gas meter in the step S100, then calling a metering module intermediate library to generate a correction list of each gas meter according to the error curve data, and then performing the step S300;
step S300, the calibration equipment sends the correction lists generated in the step S200 to corresponding gas meters one by one, each gas meter checks the received correction list, if the correction list is correct, the gas meters store the correction list and feed back the stored correction list to the calibration equipment, if the correction list is wrong, the gas meters feed back wrong response or no response to the calibration equipment, the calibration equipment judges whether the correction list fed back by the gas meters is consistent with the correction list sent to the gas meters or not according to the correction list fed back by the gas meters, if the correction list is inconsistent or the gas meters feed back the wrong response or the gas meters do not respond, the calibration equipment sends the correction list to the gas meters again until the correction list fed back by each gas meter is consistent with the correction list sent to the gas meters by the calibration equipment or the correction list is sent to the same gas meters again for a certain number of times, and then step S400 is carried out;
step S400, all the gas meters are subjected to re-calibration, the calibration equipment obtains respective second metering error values of all the gas meters corresponding to all the flow detection points according to the configured flow detection points, the calibration equipment judges whether the second metering error values of all the gas meters are in a qualified range, if yes, the gas meters are qualified, and if not, the gas meters are judged to be unqualified.
Before calibration, the tightness of the gas meter is detected, and the hardware structure of the gas meter is guaranteed to meet the factory requirements. And then, pre-running each gas meter and the calibration equipment to keep the flow of the gas flowing through the gas meters and the calibration equipment in a stable state, so that the condition that the measurement error value is too large to finish the calibration purpose due to large fluctuation of the gas flow is avoided.
Referring to fig. 2, in step S100, the calibration device obtains first measurement error values of a plurality of gas meters corresponding to each flow detection point one by one according to the sequence of the flow detection points. Specifically, in a detection period, the calibration device sends a command for reading instantaneous flow values to a plurality of gas meters corresponding to the same flow detection point at regular time, the gas meters corresponding to the flow detection point receive the read command and then feed back the current instantaneous flow values to the calibration device, and the calibration device receives and stores the instantaneous flow values fed back by the gas meters. In order to improve the accuracy and the rationality of the measurement error value, the calibration equipment sends a reading command to the gas meters at regular time and for multiple times in a detection period, and stores the instantaneous flow value fed back by each gas meter and simultaneously stores the contrast flow value detected by the calibration equipment.
The calibration equipment calculates the flow average value of each gas meter according to a plurality of instantaneous flow values fed back by each gas meter in a detection period, then calculates the flow average value of each gas meter and a reference flow value respectively to obtain a first measurement error value of each gas meter, and the calculation formula is as follows,
the measurement error value is (flow average value-control flow value)/control flow value, formula one,
the flow of the gas tends to be stable during calibration, the comparison flow value detected and stored by the calibration equipment tends to be a fixed value, calculation is carried out through the formula I, calculation is reasonable, the situation that the measurement error value is unreasonable due to fluctuation of the gas flow can be effectively avoided, and a reasonable basis is provided for calibration of the gas meter.
Referring to fig. 3, in step S300, the calibration device performs initial calibration on each gas meter in sequence. During initial calibration, the calibration equipment sends the correction list to the gas meter in a command frame mode and waits for the gas meter to respond. And the gas meter checks the check bit and format of the received correction list, and stores the correction list if the check bit and format of the received correction list are both correct. If any one of the data is wrong, the gas meter responds wrong or does not respond.
In step S300, after the gas meter stores the correction list, the gas meter feeds back the stored correction list to the calibration device, the calibration device compares the correction list fed back by the gas meter with the correction list previously sent to the gas meter, and determines whether the correction list and the correction list are consistent, and if the correction list and the correction list are consistent, the gas meter is successfully initially calibrated. And under the condition that the two gas meters are inconsistent or the gas meters respond wrongly or not, the calibration equipment retransmits the correction list to the gas meters until the correction list fed back by the gas meters is consistent with the correction list transmitted to the gas meters, and the initial calibration of all the gas meters is completed. And when the number of times that the calibration equipment retransmits the correction list to the same gas meter reaches N times and the correction list fed back by the gas meter is not consistent with the correction list transmitted to the gas meter, stopping the initial calibration of the gas meter and judging that the gas meter is unqualified. In this embodiment, N is preferably set to 5 times.
Before the calibration equipment starts the initial calibration, whether a gas meter is not configured with a correction list is searched, and if yes, the calibration equipment is switched to the next gas meter for the initial calibration. If not, the initial calibration of all the gas meters is completed, and then a re-calibration program is entered to perform step S400.
In step S400, the calibration device obtains the second metering error values of the multiple gas meters corresponding to each flow detection point one by one according to the sequence of the flow detection points. Specifically, the calibration device sends a command for reading the instantaneous flow value to a plurality of gas meters corresponding to the same flow detection point at regular time and for a plurality of times, the gas meters corresponding to the flow detection points feed back the current instantaneous flow value to the calibration device after receiving the read command, the calibration device receives and stores the instantaneous flow value fed back by each gas meter, and meanwhile, the calibration device stores the comparison flow value detected by the calibration device. And the calibration equipment calculates the flow average value of each gas meter according to a plurality of instantaneous flow values fed back by each gas meter, and then calculates the flow average value of each gas meter and the reference flow value by using the formula I to obtain a second metering error value of each gas meter.
In this embodiment, the qualified range of the small flow metering error is ± 3%, and the qualified ranges of the other flow metering errors are ± 1.5%. And if the second-time metering error value of the gas meter is within the qualified range, judging that the gas meter is qualified and meeting the factory requirements. And if the second-time measurement error value of the gas meter is not in the qualified range, judging that the gas meter is unqualified and does not meet the factory requirements.
In this embodiment, bidirectional communication is realized between the calibration device and the intermediate library of the metering module, and between the calibration device and each gas meter in an infrared wireless communication manner.
It can be understood that bidirectional communication can be realized between the calibration device and the metering module intermediate library and between the calibration device and each gas meter in a USB communication mode or a COM communication mode.
It is understood that N may be set to 3 times, 4 times, 6 times, and other reasonable times.
It is understood that the metering module in step S200 may be a thermal metering module or an ultrasonic metering module.
Example two
The second embodiment of the present invention is an improved embodiment of the first embodiment, and is improved over the first embodiment in that a display is disposed on the calibration device. In the calibration process, the first measurement error value and the second measurement error value of each gas meter are sequentially displayed on the display, so that a calibrator can conveniently know the measurement error condition of each gas meter.
Other embodiments of the present invention than the preferred embodiments described above, and those skilled in the art can make various changes and modifications according to the present invention without departing from the spirit of the present invention, should fall within the scope of the present invention defined in the claims.

Claims (10)

1. A calibration method of an electronic gas meter is characterized by comprising the following steps,
step S100, the calibration equipment obtains respective first metering error values of all the gas meters corresponding to all the flow detection points according to the configured flow detection points, and then step S200 is carried out;
step S200, firstly, generating error curve data of each gas meter by the calibration equipment according to the first metering error value of each gas meter in the step S100, then calling a metering module intermediate library to generate a correction list of each gas meter according to the error curve data, and then performing the step S300;
step S300, the calibration equipment sends the correction lists generated in the step S200 to corresponding gas meters one by one, each gas meter checks the received correction list, if the correction list is correct, the gas meters store the correction list and feed back the stored correction list to the calibration equipment, if the correction list is wrong, the gas meters feed back wrong response or no response to the calibration equipment, the calibration equipment judges whether the correction list fed back by the gas meters is consistent with the correction list sent to the gas meters or not according to the correction list fed back by the gas meters, if the correction list is inconsistent or the gas meters feed back the wrong response or the gas meters do not respond, the calibration equipment sends the correction list to the gas meters again until the correction list fed back by each gas meter is consistent with the correction list sent to the gas meters by the calibration equipment or the correction list is sent to the same gas meters again for a certain number of times, and then step S400 is carried out;
step S400, all the gas meters are subjected to re-calibration, the calibration equipment obtains respective second metering error values of all the gas meters corresponding to all the flow detection points according to the configured flow detection points, the calibration equipment judges whether the second metering error values of all the gas meters are in a qualified range, if yes, the gas meters are qualified, and if not, the gas meters are judged to be unqualified.
2. The calibration method according to claim 1, wherein in the step S100, the calibration device obtains first metering error values of the plurality of gas meters corresponding to the flow detection points one by one according to the sequence of the flow detection points.
3. The calibration method according to claim 2, wherein the calibration device simultaneously sends an instantaneous flow reading command to a plurality of gas meters corresponding to the same flow detection point at regular time in a detection period, the gas meters feed back current instantaneous flow values to the calibration device after receiving the instantaneous flow reading command, and the calibration device receives and stores the instantaneous flow values fed back by the gas meters.
4. The calibration method according to claim 3, wherein the calibration device stores the control flow value detected by the calibration device itself, simultaneously with the instantaneous flow value fed back from each gas meter.
5. The calibration method according to claim 4, wherein the calibration device calculates a flow average value of each gas meter according to a plurality of instantaneous flow values fed back by each gas meter in a detection period, and then calculates the flow average value of each gas meter with a reference flow value to obtain a first measurement error value of each gas meter.
6. The calibration method according to claim 1, wherein in step S300, the gas meter checks the check bits and format of the correction list sent by the calibration device, stores the correction list if both are correct, and feeds back an error response or no response to the calibration device if either one is wrong.
7. The calibration method of claim 1, wherein the second metrology error value is obtained in the same manner as the first metrology error value.
8. The calibration method according to claim 1, wherein before starting the step S100, each gas meter is subjected to leak detection and pre-operation.
9. The calibration method according to any one of claims 1 to 8, wherein the calibration device and each gas meter realize two-way communication through infrared wireless communication, USB communication or COM communication.
10. The calibration method according to any one of claims 1 to 8, wherein a display is provided on the calibration device, and the first and second measurement error values are sequentially displayed on the display.
CN201911364788.3A 2019-12-26 2019-12-26 Calibration method of electronic gas meter Active CN111157081B (en)

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