CN108036843B - Method for detecting indication value error of gas meter - Google Patents
Method for detecting indication value error of gas meter Download PDFInfo
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- CN108036843B CN108036843B CN201711284223.5A CN201711284223A CN108036843B CN 108036843 B CN108036843 B CN 108036843B CN 201711284223 A CN201711284223 A CN 201711284223A CN 108036843 B CN108036843 B CN 108036843B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/15—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters specially adapted for gas meters
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Abstract
The invention provides a method for calibrating a gas meter indication value error, and relates to the field of intelligent meters. The method for calibrating the gas indication value error detects the actual volume of the passing gas by using an actual volume calibrating device; detecting a target to be detected by using a target sensing device, generating a pulse signal when the target to be detected is detected, and transmitting the pulse signal to a controller; and calculating the flow point indication value error by using the controller according to the times of receiving the first pulse signal, the preset revolution volume and the actual volume of the gas. The method for calibrating the indication value error of the gas meter saves calibration time, improves calibration accuracy and calibration sensitivity, reduces energy consumption, realizes energy conservation and emission reduction, can improve the gas meter calibration technology of an enterprise, adapts to the economic situation of rapid development of the industry, and improves the competitiveness of the enterprise.
Description
Technical Field
The invention relates to the field of intelligent meters, in particular to a method for calibrating a gas indicating value error.
Background
The fuel for people to cook in daily life is changed from the conventional energy sources with serious waste and pollution of firewood, coal and the like into natural gas and coal gas. The gas meter has the advantages that only the roller with the numbers in the small glass window can be seen outside, the roller is also provided with seven digits, the front four digits of the small numbers are black, the rear three digits are red, and the gas volume can be automatically accumulated, so that people using natural gas or pipeline gas can conveniently know how much gas is used, and the payment can be carried out according to the cubic meter consumed by gas every month. The indication error of the gas meter is the percentage of the difference between the volume displayed by the gas meter and the volume actually passing through the gas meter, and is an important index for evaluating the quality of a gas meter product.
Conventionally, a diaphragm gas meter is used to measure a gas amount, and a diaphragm gas meter is an instrument that measures a gas amount on the principle of a positive displacement type. The metering cycle of the core of the diaphragm type gas meter is realized by taking two diaphragms which do reciprocating motion as power and pushing the uniform-speed rotary motion of the valve cover of the distribution valve through a double-rocker single-crank mechanism, when the mechanism completes one-time rotation, the air inlet and the air exhaust of one rotary volume are completed, the use amount of natural gas continuously rises, and the large-scale infrastructure is gradually improved, the market of the gas meter is rapidly expanded, the defects of the current gas meter indication value error verification are gradually obvious, especially the verification of a minimum flow point, the time consumption is long, the accuracy is low, the verification efficiency is low, and the production efficiency of the gas meter is limited. Therefore, the problems of long time consumption and low accuracy of the indication error detection are the main problems, and the accuracy and the efficiency of the detection need to be improved.
Disclosure of Invention
In view of the above, the present invention provides a method for calibrating an error of a gas indication value, so as to improve the above problem.
The invention provides a method for calibrating a gas indicating value error, which comprises the following steps:
detecting the actual volume of the passing gas by using an actual volume calibrating device;
detecting a first target to be detected by using a first target sensing device, generating a first pulse signal when the first target to be detected is detected, and transmitting the first pulse signal to a controller;
and calculating the indication value error of the large and medium flow points by using the controller according to the times of receiving the first pulse signal, the preset revolution volume and the actual volume of the gas.
Further, the step of calculating the indication error of the large and medium flow rate points by using the controller according to the number of times of receiving the first pulse signal, the preset revolution volume and the actual volume of the gas comprises:
using the basis of the controller
And calculating the indication value of the large and medium flow rate points, wherein,
Vcrepresenting the true value of the revolution volume of the movement, VrRepresenting the actual volume of gas passing through, n representing the number of first pulse signals acquired by the first target sensing means, ViIndicating a preset value of the revolution volume, V, of the gas meterm＝nVi，VmIndicating the indicating volume of the gas meter, E1Indicating a large and medium flow point indicating a value error.
Further, the method for calibrating the gas indication value error further comprises the following steps:
judging whether the calculated indication value error of the large and medium flow rate points is within a preset first threshold value range by using the controller;
if the indication value error of the large and medium flow points obtained by calculation is within a preset first threshold value range, generating a qualified verification result;
and if the indication value error of the large and medium flow points obtained by calculation is not within the preset first threshold value range, generating a verification unqualified result.
Further, before the steps of detecting a first object to be detected by using a first object sensing device, generating a first pulse signal when the first object to be detected is detected, and transmitting the first pulse signal to a controller, the method for calibrating the gas indication value error further includes:
judging whether the frequency of the received first pulse signal is lower than a preset frequency by using the controller;
and if the frequency of the first pulse signal is higher than the preset frequency, controlling a change-over switch to be conducted with the first target induction device.
Further, after the step of determining, by the controller, whether the frequency of the received first pulse signal is lower than a preset frequency, the method for calibrating the gas indication value error further includes:
if the frequency of the first pulse signal is lower than the preset frequency, controlling a change-over switch to be conducted with a second target induction device;
detecting a second target to be detected by using the second target sensing device, generating a second pulse signal when one second target sensing device is detected, and transmitting the second pulse signal to the controller;
calculating a gas indicating value by using the controller according to the number of the second targets to be detected, the preset value of the revolution volume and the number of times of receiving a second pulse signal;
calculating the actual gas volume passing through the gas meter by using the controller according to the number of the second targets to be detected, the actual value of the rotation volume of the machine core and the times of receiving a second pulse signal;
and calculating the small flow point indication value error by utilizing the controller according to the gas indication value and the actual gas volume of the gas meter.
Further, the step of calculating the gas indicating value by using the controller according to the number of the second targets to be detected, the preset turning volume value and the number of times of receiving the first pulse signal comprises the following steps:
using the basis formula of the controller
Calculating the actual gas volume passing through the gas meter, wherein n is the pulse receiving times of the controller, m is the number of the second targets to be detected, and ViAnd representing a preset value of the preset revolution volume of the gas meter.
Further, the step of calculating the actual gas volume passing through the gas meter by using the controller according to the number of the second target to be detected, the actual value of the rotation volume of the movement and the number of times of receiving the second pulse signal comprises:
using the basis formula of the controller
Calculating the actual gas volume passing through the gas meter, wherein n is the pulse receiving times of the controller, m is the number of the second targets to be detected, and VcAnd the real value of the revolution volume of the movement is represented.
Further, the step of calculating the actual gas volume passing through the gas meter by using the controller according to the number of the second target to be detected, the actual value of the rotation volume of the movement and the number of times of receiving the second pulse signal comprises:
using the basis formula of the controller
Calculating the indication value error of the large and medium flow points, wherein m is the number of the second targets to be detected, E2Indicating value error, V, for small flow pointscReal rotation volume of the coreValue ViAnd representing a preset value of the preset revolution volume of the gas meter.
Further, the method for calibrating the gas indication value error further comprises the following steps:
the controller is also used for judging whether the indication error of the small flow point is within a preset second threshold value range or not;
if the indication error of the small flow point is within a preset second threshold value range, generating a verification qualified result;
and if the indication error of the small flow point is not within the preset second threshold range, generating a verification unqualified result.
Compared with the prior art, the method for calibrating the gas indication value error provided by the invention has the advantages that the actual volume of the passing gas is detected by using the actual volume calibrating device; detecting a first target to be detected by using a first target sensing device, generating a first pulse signal when the first target to be detected is detected, and transmitting the first pulse signal to a controller; and calculating the indication value error of the large and medium flow points by using the controller according to the times of receiving the first pulse signal, the preset revolution volume and the actual volume of the gas. The method for calibrating the indication value error of the gas meter saves calibration time, improves calibration accuracy and calibration sensitivity, reduces energy consumption, realizes energy conservation and emission reduction, can improve the gas meter calibration technology of an enterprise, adapts to the economic situation of rapid development of the industry, and improves the competitiveness of the enterprise.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a circuit connection block diagram of a gas indication value error calibrating apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a rotating disk according to an embodiment of the present invention;
fig. 3 and 4 are flowcharts of a method for calibrating an error of a gas indication value according to an embodiment of the present invention.
Icon: 101-a first target sensing device; 102-a second target sensing device; 103-a change-over switch; 104-a first object to be detected; 105-a second target to be detected; 106-a controller; 107-actual volume verification means; 108-a register; 109-rotating the disc.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 3 and 4, an embodiment of the present invention provides a method for calibrating a gas indicating value error, which is applied to a device for calibrating a gas indicating value error. The gas indication value error calibrating device comprises a rotating disc 109, a first object 104 to be detected, an actual volume calibrating device 107, a first object sensing device 101 and a controller 106. As shown in fig. 1, the first object 104 to be detected is disposed on the rotating disc 109, in this embodiment, when a large/medium flow rate indication error needs to be detected, the first object 104 to be detected is preferably disposed at the edge of the rotating disc 109, and the number of the first object 104 to be detected may be one or more, in this embodiment, 1, and the first object sensing device 101 generates a first pulse signal once when the rotating disc 109 rotates once. The rotating disc 109 may be circular or annular or even regular polygon, without limitation. The rotating disc 109 is used to drive the first object 104 to be detected to rotate, as shown in fig. 2, the first object sensing device 101 and the actual volume calibrating device 107 are electrically connected to the controller 106 respectively. The gas meter value error calibrating device further comprises a register 108, and the register 108 is electrically connected with the controller 106. The registers 108 may be used to store parameters as well as certification results.
The method for calibrating the gas indicating value error comprises the following steps:
step S101: the actual volume of gas passing through is detected by means of the actual volume verification device 107.
Step S102: and judging whether the frequency of receiving the first pulse signal is lower than a preset frequency by using the controller 106, if so, executing the step S103, and if not, executing the step S108.
Step S103: and controlling a switch 103 to be conducted with the first target sensing device 101.
Step S104: the first target 104 is detected by a first target sensing device 101, and when the first target 104 is detected, a first pulse signal is generated and transmitted to a controller 106.
The first target to be detected 104 may be a magnet, the first target sensing device 101 may be a magnetic induction element, or the first target to be detected 104 may also be a reflective cursor, and the first target sensing device 101 may also be a photoelectric sensor.
Step S105: and calculating the indication value error of the large and medium flow points by using the controller 106 according to the times of receiving the first pulse signal, the preset revolution volume and the actual volume of the passing gas. In particular, the amount of the solvent to be used,
specifically, the controller 106 is utilized to calculate the formula
And calculating the indication value of the large and medium flow rate points, wherein,
Vcrepresenting the true value of the revolution volume of the movement, VrRepresenting the actual volume of gas passing through, n representing the number of first pulse signals acquired by the first target sensing means 101, ViIndicating a preset value of the revolution volume, V, of the gas meterm＝nVi，VmIndicating the indicating volume of the gas meter, E1The large and medium flow points indicate value errors.
Step S106: and judging whether the calculated indication error of the large and medium flow rates is within a preset first threshold value range by using the controller 106, and if so, executing the step S107.
Wherein the preset first threshold range may be, but is not limited to (-1.5%, 1.5%).
Step S107: and generating a qualified verification result.
And if the indication value error of the large and medium flow points is not within the preset first threshold range, generating a verification unqualified result.
Step S108: controlling a switch 103 to conduct with a second target sensing device 102.
The first target to be detected 104 is located on a circumference of a first radius of the rotating disc 109, the plurality of second targets to be detected 105 are arranged on a circumference of a second radius of the rotating disc 109 at equal intervals, the first radius is larger than the second radius, and the second target sensing device 102 and the first target sensing device 101 are arranged at intervals.
Step S109: the second target sensing device 102 is used to detect a second target 105 to be detected, and when one of the second target sensing devices 102 is detected, a second pulse signal is generated and transmitted to the controller 106.
In this embodiment, the second target to be detected 105 may adopt a magnet, the second target sensing device 102 may adopt a magnetic induction element, or the second target to be detected 105 may also adopt a reflective cursor, and the second target sensing device 102 may also adopt a photoelectric sensor.
Step S110: and calculating a gas indicating value by using the controller 106 according to the number of the second targets to be detected 105, the preset turning volume value and the number of times of receiving the second pulse signal.
Specifically, the controller 106 is used to calculate the formula
Calculating the actual gas volume passing through the gas meter, wherein n is the pulse frequency received by the controller, ViAnd m is the number of the second targets 105 to be detected, and represents a preset gas meter revolution volume preset value.
Step S111: and calculating the actual gas volume passing through the gas meter by using the controller 106 according to the number of the second targets to be detected 105, the actual value of the rotation volume of the movement and the times of receiving the second pulse signal.
Specifically, the controller 106 is used to calculate the formula
Calculating the actual gas volume passing through the gas meter, wherein n is the pulse frequency received by the controller, m is the number of the second targets 105 to be detected, and VcAnd the real value of the revolution volume of the movement is represented.
Step S112: and calculating the small flow point indication value error by using the controller 106 according to the gas indication value and the actual gas volume of the gas meter.
Specifically, the controller 106 is used to calculate the formula
Calculating the indication value error of the large and medium flow points, wherein n is the number of pulses received by the controller 106, m is the number of the second targets 105 to be detected, and E2Indicating errors for small flow pointsDifference, VcRepresenting the true value of the revolution volume of the movement, ViAnd representing a preset value of the preset revolution volume of the gas meter.
Step S113: the controller 106 is further used to determine whether the error of the small flow point indication value is within a preset second threshold range, and if so, step S114 is executed.
Wherein the preset second threshold range may be, but is not limited to (-3%, 3%).
Step S114: and generating a qualified verification result.
And if the indication error of the small flow point is not within the preset second threshold range, generating a verification unqualified result.
In summary, the method for calibrating the gas indication value error provided by the invention utilizes the actual volume calibrating device to detect the actual volume of the passing gas; detecting a first target to be detected by using a first target sensing device, generating a first pulse signal when the first target to be detected is detected, and transmitting the first pulse signal to a controller; calculating a large and medium flow point indication value error by using the controller according to the times of receiving the first pulse signal, a preset revolution volume and the actual volume of the gas, or detecting a second target to be detected by using a second target sensing device, generating a second pulse signal when detecting a second target sensing device, and transmitting the second pulse signal to the controller; calculating a gas indicating value by using the controller according to the number of the second targets to be detected, the preset value of the revolution volume and the number of times of receiving the second pulse signal; then, calculating the actual gas volume passing through the gas meter by using the controller according to the number of the second targets to be detected, the actual value of the rotation volume of the machine core and the times of receiving the second pulse signals; and finally, calculating the small flow point indication value error by using the controller according to the gas indication value and the actual gas volume of the gas meter. The method for calibrating the indication value error of the gas meter saves calibration time, improves calibration accuracy and calibration sensitivity, reduces energy consumption, realizes energy conservation and emission reduction, can improve the gas meter calibration technology of an enterprise, adapts to the economic situation of rapid development of the industry, and improves the competitiveness of the enterprise.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes. It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (7)
1. A method for calibrating gas indicating value errors is characterized by comprising the following steps:
detecting the actual volume of the passing gas by using an actual volume calibrating device;
detecting a first target to be detected by using a first target sensing device, generating a first pulse signal when the first target to be detected is detected, and transmitting the first pulse signal to a controller;
calculating the indicating value error of the large and medium flow points by using the controller according to the times of receiving the first pulse signal, the preset revolution volume and the actual volume of the gas;
before the steps of detecting a first target to be detected by using a first target sensing device, generating a first pulse signal when the first target to be detected is detected, and transmitting the first pulse signal to a controller, the method for calibrating the gas indication value error further comprises the following steps:
judging whether the frequency of the received first pulse signal is lower than a preset frequency by using the controller;
if the frequency of the first pulse signal is higher than the preset frequency, controlling a change-over switch to be conducted with the first target induction device;
after the step of determining, by the controller, whether the frequency of the received first pulse signal is lower than a preset frequency, the method for calibrating the gas indication value error further includes:
if the frequency of the first pulse signal is lower than the preset frequency, controlling a change-over switch to be conducted with a second target induction device;
detecting a second target to be detected by using the second target sensing device, generating a second pulse signal when one second target sensing device is detected, and transmitting the second pulse signal to the controller;
calculating a gas indicating value by using the controller according to the number of the second targets to be detected, the preset value of the revolution volume and the number of times of receiving a second pulse signal;
calculating the actual gas volume passing through the gas meter by using the controller according to the number of the second targets to be detected, the actual value of the rotation volume of the machine core and the times of receiving a second pulse signal;
and calculating the small flow point indication value error by utilizing the controller according to the gas indication value and the actual gas volume of the gas meter.
2. The method for calibrating the gas indicating value error according to claim 1, wherein the step of calculating the large and medium flow point indicating value error by using the controller according to the number of times of receiving the first pulse signal, the preset revolution volume and the actual volume of the gas comprises the following steps:
using the basis of the controller
And calculating the indication value of the large and medium flow rate points, wherein,
Vcrepresenting the true value of the revolution volume of the movement, VrRepresenting the actual volume of gas passing through, and n represents the first pulse signal collected by the first target sensing deviceNumber of numbers, ViIndicating a preset value of the revolution volume, V, of the gas meterm＝nVi，VmIndicating the indicating volume of the gas meter, E1The large and medium flow points indicate value errors.
3. The method for calibrating the gas indicating value error according to claim 1, further comprising:
judging whether the calculated indication value error of the large and medium flow rate points is within a preset first threshold value range by using the controller;
if the indication value error of the large and medium flow points obtained by calculation is within a preset first threshold value range, generating a qualified verification result;
and if the indication value error of the large and medium flow points obtained by calculation is not within the preset first threshold value range, generating a verification unqualified result.
4. The method for calibrating the gas indication value error according to claim 1, wherein the step of calculating the gas indication value by using the controller according to the number of the second targets to be detected, the preset revolution volume value and the number of times of receiving the first pulse signal comprises the following steps:
using the basis formula of the controller
Calculating the actual gas volume passing through the gas meter, wherein m is the number of the second targets to be detected, ViAnd representing a preset value of the preset revolution volume of the gas meter.
5. The method for calibrating the gas meter value error according to claim 4, wherein the step of calculating the actual gas volume passing through the gas meter by using the controller according to the number of the second target to be detected, the actual value of the rotation volume of the movement and the number of times of receiving the second pulse signal comprises the following steps:
using the basis formula of the controller
Calculating the actual gas volume passing through the gas meter, wherein n is the pulse receiving times of the controller, m is the number of the second targets to be detected, and VcAnd the real value of the revolution volume of the movement is represented.
6. The method for calibrating the gas meter value error according to claim 4, wherein the step of calculating the actual gas volume passing through the gas meter by using the controller according to the number of the second target to be detected, the actual value of the rotation volume of the movement and the number of times of receiving the second pulse signal comprises the following steps:
using the basis formula of the controller
Calculating indication errors of the large and medium flow points, wherein n is the number of times of receiving pulses by the controller, m is the number of second targets to be detected, and E2Indicating value error, V, for small flow pointscRepresenting the true value of the revolution volume of the movement, ViAnd representing a preset value of the preset revolution volume of the gas meter.
7. The method of calibrating a gas meter value error according to claim 4, further comprising:
judging whether the indication error of the small flow point is within a preset second threshold value range by using the controller;
if the indication error of the small flow point is within a preset second threshold value range, generating a verification qualified result;
and if the indication error of the small flow point is not within the preset second threshold range, generating a verification unqualified result.
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| JP2002303540A (en) * | 2001-04-06 | 2002-10-18 | Tokyo Gas Co Ltd | Fluidic gas meter |
| CN103278220A (en) * | 2013-06-05 | 2013-09-04 | 中国计量学院 | Method for rapidly verifying intrinsic errors of membrane type gas meter and device thereof |
| CN103884405A (en) * | 2014-04-15 | 2014-06-25 | 湖南威铭能源科技有限公司 | Gas meter correction method based on liquid crystal screen display |
| CN106643950A (en) * | 2016-11-11 | 2017-05-10 | 辽宁航宇星物联仪表科技有限公司 | Electronic multi-points modification method of membrane gas meter |
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