CN114923547A - Automatic evaluation device and method for uncertainty of gas meter indication value error - Google Patents
Automatic evaluation device and method for uncertainty of gas meter indication value error Download PDFInfo
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Abstract
The invention discloses an automatic evaluation device for uncertainty of gas indicating value error, belonging to the technical field of gas flow detection, comprising an indicating value sampler and a display, and being characterized in that: the gas flow standard device is used for obtaining the indication value of the gas meter, the gas flow standard device is used for obtaining a reference value, the error measuring module is used for calculating the indication value error and judging whether the indication value error is qualified or not, the verification information module is used for storing factory parameters of the gas flow standard device, factory parameters of the sensor, verification object information and verification scheme information, and the uncertainty evaluation module is used for evaluating the uncertainty of the indication value error. The invention comprehensively judges whether the gas meter is qualified or not through the indication error and the extended uncertainty of the indication error, and can effectively improve the accuracy of gas meter verification.
Description
Technical Field
The invention relates to the technical field of gas flow detection, in particular to an automatic evaluation device and method for uncertainty of gas meter indicating value errors.
Background
The traditional gas meter display system is realized by adopting a mechanical transmission subsystem and a decimal mechanical counter, a roller of the mechanical counter can receive the used gas amount information transmitted by an output shaft of the transmission subsystem to perform addition operation, and the roller counts by one every time a unit amount is used, so that gas amount metering recording and storage are finally realized. The indicating value display system of the electronic gas meter is realized by adopting an electromechanical conversion device and an electronic counter which are arranged on a mechanical display system, and metering, recording and storing are carried out by additionally or independently adopting an electronic display and storage mode on the basis of mechanical display and storage.
After the gas meter is produced, the performance of the gas meter needs to be verified, at present, a negative pressure method critical flow venturi nozzle type gas meter verification device is often adopted, namely, a standard device is used for determining the indication error of the gas meter, and the measured indication error is compared with the set maximum allowable error to judge whether the gas meter is qualified. The method has the disadvantages that the uncertainty of the default indicating value error is in accordance with the allowable value, and whether the gas meter is qualified or not is judged only through the indicating value error, so the accuracy is low.
The Chinese patent document with publication number CN202092737U and publication date 28/12/2011 discloses a standard meter method gas flow standard device for realizing a self-checking function, which is characterized by comprising a standard meter system, a detected gas flow meter, a measuring system, a pipeline system, a gas source system and a control system; the standard meter system adopts two types of standard meters of a gas turbine flowmeter and a critical flow Venturi nozzle, and the measuring system comprises a critical flow Venturi nozzle measuring component, a gas turbine standard meter, a temperature and pressure measuring meter at the position of the detected flowmeter, a hygrometer and a timer; the pipeline system comprises an air source pipeline, a standard meter pipeline and a detected flowmeter pipeline; the air source system takes atmosphere as an air source and adopts a fan or a vacuum pump device; the control system is a control system taking a PC as a base; the gas source system is connected with the standard meter system and the detected gas flowmeter through the pipeline system, the negative pressure method is adopted, the fan or the pump is used for pumping gas, the gas continuously passes through the standard meter and the detected gas flowmeter in the same time interval, the output values of the standard meter and the detected gas flowmeter are measured through the measuring system, and all field equipment control, data acquisition and data processing are completed through the control system which takes the PC as a basic control system.
The standard meter method gas flow rate standard device for realizing the self-checking function disclosed in the patent document can realize the self-checking function of the device, and can realize the expansion of the measurement range of the whole set of device by parallel use. However, whether the gas meter is qualified or not is still judged through indicating errors, and the verification accuracy is low.
Disclosure of Invention
The invention provides an automatic evaluation device and method for uncertainty of indicating value errors of a gas meter, aiming at overcoming the defects of the prior art.
The invention is realized by the following technical scheme:
an automatic assessment device for gas indicating value error uncertainty, which comprises an indicating value sampler and a display used for displaying information, and is characterized in that: the gas flow standard device is used for obtaining the indication value of the gas meter, the gas flow standard device is used for obtaining a reference value, the sensor is used for measuring the gas flow parameter of a detection medium and the test environment parameter, the error measuring module is used for calculating the indication value error and judging whether the indication value error is qualified or not, the verification information module is used for storing the delivery parameters of the gas flow standard device, the delivery parameters of the sensor, verification object information and verification scheme information, the uncertainty evaluating module is used for evaluating the uncertainty of the indication value error, and the data caching module is used for storing internal and external caching data.
The indicating value sampler comprises a time measurement standard device, a counter and an indicating value calculator, wherein the time measurement standard device is used for collecting and recording the duration of sampling signals, the counter is used for collecting and recording the number of the samples, and the indicating value calculator is used for indicating value calculation.
The sensor comprises a pressure sensor, a temperature sensor, a differential pressure sensor, a humidity sensor and a crystal oscillator.
The error determination module comprises an error calculator and an error determiner, wherein the error calculator calculates an indicating value error by using the measurement data; the error determiner receives the indicating value error and determines whether the indicating value error is qualified.
The uncertainty evaluation module comprises an A-type relative uncertainty evaluation module, a B-type relative uncertainty evaluation module, a synthesis module and a calculation module, wherein the A-type relative uncertainty module is used for calculating A-type relative uncertainty of a correction coefficient according to an indication error of repeated measurement; the B-type relative uncertainty evaluation module is used for extracting the expansion uncertainty of each parameter according to the certificate information stored in the verification information module and calculating the B-type relative uncertainty of the sensitivity coefficient and the correction coefficient of each parameter according to a calculation formula; the synthesis module is used for calculating the expansion uncertainty of the correction coefficient according to the A-type relative uncertainty of the correction coefficient and the B-type relative uncertainty of the correction coefficient; and the calculation module is used for converting the expansion uncertainty of the correction coefficient into the expansion uncertainty of the indicating value error according to the calculation model.
A gas meter indication value error uncertainty evaluation method is characterized by comprising the following steps: the method comprises the following steps:
a. repeatedly measuring gas indicating value V ind Calculating the reference magnitude V provided by the standard device by equation 1 ref Calculating an indicating value error e through an equation 2;
wherein, V ref Reference value provided for the etalon, eta is leakage coefficient, C d Is the discharge coefficient of the nozzle, A * Is the throat area of the nozzle, C * As a function of the flow of the nozzle, p 0 Is the nozzle upstream stagnation pressure, Z is the gas compression coefficient at the gas meter under test, T is the temperature at the gas meter under test, p is the pressure at the gas meter under test, M is the molar mass of the dielectric gas, T is the gas pressure at the gas meter under test 0 Is the stagnation temperature of the gas upstream of the nozzle, R isUniversal gas constant, tau is detection time;
wherein e is an indication error, V ind For indicating a value, V, for a gas meter ref A reference magnitude provided for a standard;
b. calculating a correction coefficient of each measurement through formula 3;
wherein f is crt，i Correction factor, V, for a single measurement ref，i Reference value, V, provided for a single measurement standard ind，i For a single measurement of the gas indication value, e i Indicating error in single measurement;
c. based on the number of repeated measurements, the A-class relative standard uncertainty u of the correction coefficient is calculated by equation 4 r，A (f crt )；
Wherein u is r，A (f crt ) Class A relative standard uncertainty, s (f), for correction factor crt ) To correct for the standard deviation of the coefficient n measurements,
is the arithmetic mean of the correction factor n measurements;
d. extracting the expansion uncertainty of each parameter according to the certificate information stored in the verification information module, and dividing the expansion uncertainty by a factor k to obtain the relative standard uncertainty u of each parameter r (component (s)) i ) Calculating the sensitivity coefficient C of all components ri (component (s)) i ) And calculating and obtaining the B-type relative standard uncertainty u introduced by standard value measurement through formula 5 r (V ref )；
Wherein u is r (V ref ) Class B relative standard uncertainty introduced for standard value measurement, C ri (component (s)) i ) Is the sensitivity coefficient of the ith component, u r (component (s)) i ) Relative standard uncertainty for the ith component;
e. calculating the uncertainty u of B-type relative standard introduced by the gas indicating value r (V ind )；
f. Measuring the introduced B-type relative standard uncertainty u according to the standard value r (V ref ) And B-class relative standard uncertainty u introduced by gas indicating value r (V ind ) And synthesizing the B-type relative standard uncertainty u of the correction coefficient r，B (f crt )；
g. Class A relative standard uncertainty u in combination with correction factor r，A (f crt ) And the class B relative standard uncertainty u of the correction factor r，B (f crt ) Calculating relative synthesis standard uncertainty u r，c (f crt )；
h. Calculating the expansion uncertainty U of the indicating value error by the formula 10;
U＝k·(1+e)u r，c (f crt ) Formula 10
Wherein U is the expansion uncertainty of the indicating error, k is the inclusion factor, e is the indicating error, U r，c (f crt ) Relative synthesis standard uncertainty.
In said step d, the sensitivity coefficient C ri (component (C) i ) Calculating by the formula 6;
wherein, C ri (component (C) i ) Is the sensitivity coefficient of the i-th component, V ref The reference quantity value provided for the etalon,
is a partial derivative; component(s) of i Is leakage coefficient eta, discharge coefficient C of nozzle d Throat area A of the nozzle * Flow function of nozzle C * Nozzle upstream stagnation pressure p 0 Gas compression coefficient Z of gas to be tested, temperature T of gas to be tested, pressure p of gas to be tested, molar mass M of medium gas, stagnation temperature T of gas at upstream of nozzle 0 A universal gas constant R or a detection time τ.
In the step e, calculating the uncertainty u of the B-type relative standard introduced by the gas indicating value r (V ind ) The method comprises the steps of calculating according to manual reading or mechanical reading;
when manual reading is carried out, B-type relative standard uncertainty u introduced by gas indicating value r (V ind ) Is the interval half-width divided by the inclusion factor k;
when mechanical reading is carried out, the B-type relative standard uncertainty u introduced by the gas indicating value r (V ind ) The extended uncertainty for each parameter is extracted for certificate information stored in the certification information module divided by an inclusion factor k.
In said step f, the class B relative standard uncertainty u of the correction factor r，B (f crt ) Calculating by the formula 8;
wherein u is r，B (f crt ) For correction of the B-type relative standard uncertainty, u, of the coefficient r (V ind ) Class B relative standard uncertainty, u, introduced for gas meter readings r (V ref ) The class B relative standard uncertainty introduced is measured for standard values.
In said step g, relative synthesis standard uncertainty u r，c (f crt ) Calculating by formula 9;
wherein u is r，c (f crt ) For relative synthesis standard uncertainty, u r，A (f crt ) For correction of the A-type relative standard uncertainty, u, of the coefficient r，B (f crt ) Is the class B relative standard uncertainty of the correction factor.
The verification principle applied to the gas meter is as follows:
under specified conditions, the detection medium gas source provides a continuous gas flow through the gas meter and the evaluation device in series, and then is discharged from the detection medium discharge port downstream of the evaluation device.
Firstly, determining the relationship between a standard value obtained by an evaluation device and an indication value of the gas meter, namely the measurement process of an indication value error; calculating the A-type relative standard uncertainty and the B-type relative standard uncertainty of the correction coefficient through a built-in uncertainty evaluation module; calculating the relative synthesis standard uncertainty of the correction coefficient; according to formula derivation, converting the relative synthesis standard uncertainty of the correction coefficient into the extended uncertainty of the indicating value error; and finally, evaluating the gas meter according to the indication error and the expansion uncertainty of the indication error to obtain a verification result.
The beneficial effects of the invention are mainly shown in the following aspects:
1. according to the invention, the indicating value of the measured object and the corresponding reference value are measured by the evaluation device, the indicating value error of each flow point can be obtained, the uncertainty of the indicating value error is evaluated, whether the gas meter is qualified or not is comprehensively judged by two indexes of the indicating value error and the extended uncertainty of the indicating value error, and the accuracy of gas meter verification can be effectively improved.
2. According to the invention, the uncertainty evaluation module is arranged in the evaluation device, so that the uncertainty of the gas meter can be automatically evaluated in the verification process, the workload of manual calculation of the uncertainty is reduced, and the cost is reduced.
3. According to the invention, the standard device generates the gas meter indication value error and gives out the uncertainty evaluation result, so that the performance evaluation and verification of the gas meter are comprehensively realized, and the accuracy is higher.
Drawings
The invention will be further described in detail with reference to the drawings and the following detailed description:
FIG. 1 is a block diagram showing the structure of an automatic evaluation apparatus according to the present invention;
FIG. 2 is a block flow diagram of the uncertainty assessment method of the present invention;
the labels in the figure are: 1. the device comprises an indication sampler, a display, a gas flow standard device, a sensor, a 5, an error measuring module, a 6, a verification information module, a 7, an uncertainty evaluation module, a 8, a data cache module, a 9, a time measuring standard device, a 10, a counter, a 11, an indication calculator, a 12, an error calculator, a 13, an error judger, a 14 and A relative uncertainty evaluation module, a 15 and B relative uncertainty evaluation module, a 16, a synthesis module, a 17 and a calculation module.
Detailed Description
Example 1
Referring to fig. 1, an automatic assessment device for uncertainty of a gas meter indication value error comprises an indication value sampler 1 and a display 2 for displaying information, and further comprises a gas flow standard 3, a sensor 4, an error measurement module 5, a verification information module 6, an uncertainty assessment module 7 and a data cache module 8 which are electrically connected, wherein the indication value sampler 1 is used for acquiring an indication value of a gas meter, the gas flow standard 3 is used for acquiring a reference value, the sensor 4 is used for measuring a detection medium gas flow parameter and a test environment parameter, the error measurement module 5 is used for calculating an indication value error and determining whether the indication value error is qualified, the verification information module 6 is used for storing factory parameters of the gas flow standard 3, factory parameters of the sensor 4, verification object information and verification scheme information, the uncertainty assessment module 7 is used for uncertainty assessment of the indication value error, the data caching module 8 is used for storing internal and external cache data.
The embodiment is the most basic implementation mode, the indicating value of the measured object and the corresponding reference value are measured by the evaluation device, the indicating value error of each flow point can be obtained, the uncertainty of the indicating value error is evaluated, whether the gas meter is qualified or not is comprehensively judged through two indexes of the indicating value error and the extended uncertainty of the indicating value error, and the accuracy of gas meter verification can be effectively improved.
Example 2
Referring to fig. 1, an automatic assessment device for uncertainty of a gas meter indication value error comprises an indication value sampler 1 and a display 2 for displaying information, and further comprises a gas flow standard 3, a sensor 4, an error measurement module 5, a verification information module 6, an uncertainty assessment module 7 and a data cache module 8 which are electrically connected, wherein the indication value sampler 1 is used for acquiring an indication value of a gas meter, the gas flow standard 3 is used for acquiring a reference value, the sensor 4 is used for measuring a detection medium gas flow parameter and a test environment parameter, the error measurement module 5 is used for calculating an indication value error and determining whether the indication value error is qualified, the verification information module 6 is used for storing factory parameters of the gas flow standard 3, factory parameters of the sensor 4, verification object information and verification scheme information, the uncertainty assessment module 7 is used for uncertainty assessment of the indication value error, the data caching module 8 is used for storing internal and external caching data.
The indicating value sampler 1 comprises a time measurement standard device 9, a counter 10 and an indicating value calculator 11, wherein the time measurement standard device 9 is used for collecting and recording the duration of sampling signals, the counter 10 is used for collecting and recording the number of the samples, and the indicating value calculator 11 is used for indicating value calculation.
The sensor 4 comprises a pressure sensor, a temperature sensor, a differential pressure sensor, a humidity sensor and a crystal oscillator.
The error determination module 5 comprises an error calculator 12 and an error determiner 13, wherein the error calculator 12 calculates an indication error by using measurement data; the error determiner 13 receives the indication error and determines whether the indication error is acceptable.
Further, the uncertainty evaluation module 7 comprises a type a relative uncertainty evaluation module 14, a type B relative uncertainty evaluation module 15, a synthesis module 16 and a calculation module 17, wherein the type a relative uncertainty evaluation module is used for calculating the type a relative uncertainty of the correction coefficient according to the indication error of the repeated measurement; the B-type relative uncertainty evaluation module 15 is used for extracting the expansion uncertainty of each parameter according to the certificate information stored in the verification information module 6, and calculating the B-type relative uncertainty of the sensitivity coefficient and the correction coefficient of each parameter according to a calculation formula; the synthesis module 16 is configured to calculate an expansion uncertainty of the correction coefficient according to the class a relative uncertainty of the correction coefficient and the class B relative uncertainty of the correction coefficient; the calculation module 17 is configured to convert the extended uncertainty of the correction coefficient into an extended uncertainty of the indication error according to a calculation model.
The embodiment is a preferred embodiment, and the uncertainty evaluation module 7 is built in the evaluation device, so that the automatic evaluation of the uncertainty of the gas meter can be realized in the verification process, the workload of manual uncertainty calculation is reduced, and the cost is reduced.
Example 3
Referring to fig. 1 and 2, a method for evaluating uncertainty of an error of a gas meter, includes the following steps:
a. repeatedly measuring gas indicating value V ind Calculating the reference magnitude V provided by the standard device by equation 1 ref Calculating an indicating value error e through an equation 2;
wherein, V ref Reference value provided for the etalon, eta is leakage coefficient, C d Is the discharge coefficient of the nozzle, A * Is the throat area of the nozzle, C * As a function of the flow of the nozzle, p 0 Is the nozzle upstream stagnation pressure, Z is the gas compression coefficient at the gas meter under test, T is the temperature at the gas meter under test, p is the pressure at the gas meter under test, M is the molar mass of the dielectric gas, T is the gas pressure at the gas meter under test 0 Is the stagnation temperature of the gas upstream of the nozzle, R is the universal gas constant, and τ is the detection time;
wherein e is an indication error, V ind For indicating a value, V, for a gas meter ref A reference magnitude provided for a etalon;
b. calculating a correction coefficient of each measurement through formula 3;
wherein f is crt，i Correction factor, V, for a single measurement ref，i Reference value, V, provided for a single measurement standard ind，i For a single measurement of the gas indication value, e i Indicating value error in single measurement;
c. based on the number of repeated measurements, the A-class relative standard uncertainty u of the correction coefficient is calculated by equation 4 r，A (f crt )；
Wherein u is r，A (f crt ) Class A relative standard uncertainty, s (f), for correction factor crt ) To correct for the standard deviation of the coefficient n measurements,
is the arithmetic mean of the correction factor n measurements;
d. extracting the expansion uncertainty of each parameter according to the certificate information stored in the verification information module 6, and dividing the expansion uncertainty by a factor k to obtain the relative standard uncertainty u of each parameter r (component (C) i ) Calculating the sensitivity coefficient C of all components ri (component (C) i ) And calculating and obtaining B-type relative standard uncertainty u introduced by standard value measurement by formula 5 r (V ref )；
Wherein u is r (V ref ) Class B relative Standard uncertainty introduced for Standard value measurements, C ri (component (C) i ) Is the sensitivity coefficient of the ith component, u r (component (C) i ) Relative standard uncertainty for the ith component;
e. calculating the uncertainty u of B-type relative standard introduced by the gas indicating value r (V ind )；
f. Measuring the introduced class B relative standard uncertainty u according to the standard value r (V ref ) And B-class relative standard uncertainty u introduced by gas indicating value r (V ind ) And synthesizing the B-type relative standard uncertainty u of the correction coefficient r，B (f crt )；
g. Class A relative standard uncertainty u in combination with correction factor r，A (f crt ) And the class B relative standard uncertainty u of the correction factor r，B (f crt ) Calculating relative synthesis standard uncertainty u r，c (f crt )；
h. Calculating the expansion uncertainty U of the indicating value error by the formula 10;
U＝k·(1+e)u r，c (f crt ) Formula 10
Wherein U is the extension uncertainty of the indicating error, k is the inclusion factor, e is the indicating error, U is the value error r，c (f crt ) Relative synthesis standard uncertainty.
In said step d, the sensitivity coefficient C ri (component (C) i ) Calculating by equation 6;
wherein, C ri (component (C) i ) Is the sensitivity coefficient of the i-th component, V ref The reference quantity value provided for the etalon,
is a partial derivative; component(s) of i Is leakage coefficient eta, discharge coefficient C of nozzle d Throat area A of the nozzle * Flow function of nozzle C * Nozzle upstream stagnation pressure p 0 Gas compression coefficient Z of gas meter to be tested, temperature T of gas meter to be tested, pressure p of gas meter to be tested, molar mass M of medium gas, and stagnation temperature T of gas upstream of nozzle 0 A universal gas constant R or a detection time τ.
In the step e, calculating the type B relative standard uncertainty u introduced by the gas indicating value r (V ind ) The method comprises the steps of calculating according to manual reading or mechanical reading;
when manual reading is carried out, B-type relative standard uncertainty u introduced by gas indicating value r (V ind ) Is the interval half-width divided by the inclusion factor k;
when mechanical reading is carried out, the B-type relative standard uncertainty u introduced by the gas indicating value r (V ind ) The extended uncertainty of each parameter divided by the inclusion factor k is extracted for the certificate information stored in the certification information module 6.
In said step f, the class B relative standard uncertainty u of the correction factor r，B (f crt ) Calculating by the formula 8;
wherein u is r，B (f crt ) Class B relative standard uncertainty, u, for correction factor r (V ind ) Class B relative standard uncertainty, u, introduced for gas meter readings r (V ref ) The class B relative standard uncertainty introduced is measured for standard values.
In said step g, relative synthesis standard uncertainty u r，c (f crt ) Calculating by formula 9;
wherein u is r，d (f crt ) For the purpose of relative synthesis standard uncertainty,u r，A (f crt ) For correction of the A-type relative standard uncertainty, u, of the coefficient r，B (f crt ) Is the class B relative standard uncertainty of the correction factor.
The embodiment is the best implementation mode, and by adopting the evaluation method, the uncertainty evaluation result is given while the standard generates the gas meter indication value error, so that the performance evaluation and verification of the gas meter are comprehensively realized, and the accuracy is higher.
The verification process applied to the gas meter comprises the following steps:
when the extended uncertainty U (k is 2) of the indicating error is not more than one third of the absolute value of the maximum allowable error of the corresponding flow range, namely U is less than or equal to 1/3. MPEV, the judgment standard is as follows:
MPEV with | e | < or equal to | is judged to be qualified
If iei > MPEV is judged to be unqualified
When the extended uncertainty U of the indication error is greater than one third of the absolute value of the maximum allowable error for the corresponding flow range, i.e., U > 1/3-MPEV,
the domestic judgment standard is as follows:
the MPEV-U with the E less than or equal to is judged to be qualified
The value of e is more than or equal to MPEV + U and is judged as unqualified
MPEV-U < | e | < MPEV + U is judged to be undetermined
The international judgment standard is as follows:
according to OIML R137-1&2: 2012 'gas meter' 11.1.2 clause, the maximum allowable error can be reduced on the premise that U is less than or equal to MPEV, and the MPE is narrowed to MPE Shrinking ± (4/3 · MPEV-U), i.e.:
if the e is less than or equal to +/- (+/-) (4/3. MPEV-U), judging the product to be qualified
e > +/- (4/3. MPEV-U) is judged as unqualified.
Claims (10)
1. An automatic assessment device for gas indicating value error uncertainty, which comprises an indicating value sampler (1) and a display (2) for displaying information, and is characterized in that: also comprises a gas flow standard device (3), a sensor (4), an error measuring module (5), a verification information module (6), an uncertainty evaluation module (7) and a data cache module (8) which are electrically connected, the indicating value sampler (1) is used for obtaining the indicating value of the gas meter, the gas flow standard device (3) is used for obtaining a reference value, the sensor (4) is used for measuring the air flow parameter of the detection medium and the test environment parameter, the error determination module (5) is used for calculating the indicating error and judging whether the indicating error is qualified or not, the verification information module (6) is used for storing factory parameters of the gas flow standard device (3), factory parameters of the sensor (4), verification object information and verification scheme information, the uncertainty evaluation module (7) is used for evaluating the uncertainty of the indication error, and the data caching module (8) is used for storing internal and external cached data.
2. The automatic evaluation device for the uncertainty of the gas-indicating value error according to claim 1, characterized in that: the indicating value sampler (1) comprises a time measurement standard device (9), a counter (10) and an indicating value calculator (11), wherein the time measurement standard device (9) is used for collecting and recording the duration of sampling signals, the counter (10) is used for collecting and recording the number of the sampling signals, and the indicating value calculator (11) is used for indicating value calculation.
3. A gas meter value error uncertainty automatic assessment apparatus according to claim 1, characterized in that: the sensor (4) comprises a pressure sensor, a temperature sensor, a differential pressure sensor, a humidity sensor and a crystal oscillator.
4. A gas meter value error uncertainty automatic assessment apparatus according to claim 1, characterized in that: the error determination module (5) comprises an error calculator (12) and an error determiner (13), wherein the error calculator (12) calculates an indication error by using the measurement data; an error determiner (13) receives the indication error and determines whether the indication error is acceptable.
5. The automatic evaluation device for the uncertainty of the gas-indicating value error according to claim 1, characterized in that: the uncertainty evaluation module (7) comprises an A-type relative uncertainty evaluation module (14), a B-type relative uncertainty evaluation module (15), a synthesis module (16) and a calculation module (17), wherein the A-type relative uncertainty module is used for calculating the A-type relative uncertainty of the correction coefficient according to the indicating value errors of repeated measurement; the B-type relative uncertainty evaluation module (15) is used for extracting the expansion uncertainty of each parameter according to the certificate information stored in the verification information module (6), and calculating the B-type relative uncertainty of the sensitivity coefficient and the correction coefficient of each parameter according to a calculation formula; the synthesis module (16) is used for calculating the expansion uncertainty of the correction coefficient according to the A-type relative uncertainty of the correction coefficient and the B-type relative uncertainty of the correction coefficient; the calculation module (17) is used for converting the expansion uncertainty of the correction coefficient into the expansion uncertainty of the indicating value error according to the calculation model.
6. A gas meter indication value error uncertainty evaluation method is characterized by comprising the following steps: the method comprises the following steps:
a. repeatedly measuring gas indicating value V ind Calculating the reference magnitude V provided by the standard device by equation 1 ref Calculating an indicating value error e by using the formula 2;
wherein, V ref Reference value provided for the etalon, η being the leakage coefficient, C d Is the discharge coefficient of the nozzle, A * Is the throat area of the nozzle, C * As a function of the flow of the nozzle, p 0 Is the nozzle upstream stagnation pressure, Z is the gas compression coefficient at the gas meter under test, T is the temperature at the gas meter under test, p is the pressure at the gas meter under test, M is the molar mass of the dielectric gas, T is the gas pressure at the gas meter under test 0 Is the stagnation temperature of the gas upstream of the nozzle, R is the universal gas constant, and τ is the detection time;
wherein e is an indication error，V ind For indicating the value, V, of the gas meter ref A reference magnitude provided for a standard;
b. calculating a correction coefficient of each measurement according to the formula 3;
wherein, f crt，i Correction factor, V, for a single measurement ref，i Reference value, V, provided for a single measurement standard ind，i For a single measurement of the gas indication, e i Indicating value error in single measurement;
c. calculating the A-type relative standard uncertainty u of the correction coefficient according to the repeated measurement times by the formula 4 r，A (f crt )；
Wherein u is r，A (f crt ) Class A relative standard uncertainty, s (f), for correction factor crt ) To correct for the standard deviation of the coefficient n measurements,
is the arithmetic mean of the correction factor n measurements;
d. extracting the expansion uncertainty of each parameter according to certificate information stored in a verification information module (6), and dividing the expansion uncertainty by an inclusion factor k to obtain the relative standard uncertainty u of each parameter r (component (C) i ) Calculating the sensitivity coefficient C of all components ri (component (s)) i ) And calculating and obtaining the B-type relative standard uncertainty u introduced by standard value measurement through formula 5 r (V ref )；
Wherein u is r (V ref ) Class B relative Standard uncertainty introduced for Standard value measurements, C ri (component (s)) i ) Is the sensitivity coefficient of the i-th component, u r (component (s)) i ) Relative standard uncertainty for the ith component;
e. calculating the uncertainty u of B-type relative standard introduced by the gas indicating value r (V ind )；
f. Measuring the introduced class B relative standard uncertainty u according to the standard value r (V ref ) And B-class relative standard uncertainty u introduced by gas indicating value r (V ind ) And synthesizing the B-type relative standard uncertainty u of the correction coefficient r，B (f crt )；
g. Class A relative standard uncertainty u in combination with correction factor r，A (fcrt) and class B relative Standard uncertainty of correction factor u r，B (f crt ) Calculating relative synthesis standard uncertainty u r，c (f crt )；
h. Calculating the expansion uncertainty U of the indicating value error by the formula 10;
U＝k·(1+e)u r，c (f crt ) Formula 10
Wherein U is the expansion uncertainty of the indicating error, k is the inclusion factor, e is the indicating error, U r，c (f crt ) Relative synthesis standard uncertainty.
7. A gas meter value error uncertainty assessment method according to claim 6, characterized in that: in said step d, the sensitivity coefficient C ri (component (s)) i ) Calculating by the formula 6;
wherein, C ri (component (C) i ) Is the sensitivity coefficient of the i-th component, V ref The reference quantity value provided for the etalon,
is a partial derivative; component(s) of i Is leakage coefficient eta, discharge coefficient C of nozzle d Throat area A of the nozzle * Flow function of nozzle C * Nozzle upstream stagnation pressure p 0 Gas compression coefficient Z of gas to be tested, temperature T of gas to be tested, pressure p of gas to be tested, molar mass M of medium gas, stagnation temperature T of gas at upstream of nozzle 0 Universal gas constant R or detection time τ.
8. A gas meter value error uncertainty assessment method according to claim 6, characterized in that: in the step e, calculating the type B relative standard uncertainty u introduced by the gas indicating value r (V ind ) The method comprises the steps of calculating according to manual reading or mechanical reading;
when manual reading is carried out, the type B relative standard uncertainty u introduced by the gas indicating value r (V ind ) Is the interval half-width divided by the inclusion factor k;
when mechanical reading is carried out, the type B relative standard uncertainty u introduced by the gas indicating value r (V ind ) The extended uncertainty of each parameter is extracted for certificate information stored in a certification information module (6) divided by an inclusion factor k.
9. The method of claim 6, wherein the method comprises the following steps: in said step f, the class B relative standard uncertainty u of the correction factor r，B (f crt ) Calculating by equation 8;
wherein u is r，B (f crt ) For correction of the B-type relative standard uncertainty, u, of the coefficient r (V ind ) Class B relative standard uncertainty, u, introduced for gas meter readings r (V ref ) Introduction of class B relative Standard uncertainty for Standard value measurementAnd (5) determining the degree.
10. A gas meter value error uncertainty assessment method according to claim 6, characterized in that: in said step g, relative synthesis standard uncertainty u r，c (f crt ) Calculated by equation 9;
wherein u is r，c (f crt ) For relative synthesis standard uncertainty, u r，A (f crt ) Class A relative standard uncertainty, u, for correction factor r，B (f crt ) Is the class B relative standard uncertainty of the correction factor.
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