JJF 1172-2007 Calibration Specification for Volatile Organic Compound Photoionization Detector JJF1172-2007 Standard download decompression password: www.bzxz.net
This specification is applicable to the calibration of volatile organic compound photoionization detectors for detecting the concentration of volatile organic compounds in the air (non-mining working environment).

National Metrology Technical Specification of the People's Republic of China JJF 1172-2007
Calibration Specification for Volatile OrganicCompounds Photo Ionization Detectors200702 ~ 28 Issued
Implementation 2007 ~ 05 - 28 Issued by the General Administration of Quality Supervision, Inspection and Quarantine JJF 1172-~2007
Calibration Specification for Volatile OrganieCompounds Photo Ionization DetectorsJJF 1172—2007
This specification was approved by the General Administration of Quality Supervision, Inspection and Quarantine on February 28, 2007, and came into effect on May 28, 2007.
Responsible unit: National Environmental Chemical Metrology Technical Committee Drafting unit: Shanghai Institute of Metrology and Testing Technology This specification is entrusted to the National Environmental Chemical Metrology Technical Committee for interpretation. ht
Drafters of this specification:
JJF1172
Cai Jianhua (Shanghai Institute of Metrology and Testing Technology) Zheng Chunrong (Shanghai Institute of Metrology and Testing Technology) h
1 Scope·
2 Overview
3 Metrological characteristics·
3.1 Measuring range·
3.2 Indication Error,
3.3 Repeatability·
3.4 ​​Response time
3.5 Drift
4. Calibration conditions:
4.1 Environmental conditions
4.2 Standards and other equipment
5 Calibration items and calibration methods
5.1 Adjustment of the instrument
5.2 Indication error
5.3 Repeatability·
5.4 Response time
5.5 Drift
6 Expression of calibration results
7 Recalibration time interval·
JJF 1172--2007
Appendix A Calibration record of volatile organic compound photoionization detector Appendix 3 Contents of calibration results of calibration certificate or calibration report Appendix C Uncertainty assessment of calibration results
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(2)
1 Scope
JJF 1172--2007
Calibration specification of volatile organic compound photoionization detector This specification applies to the calibration of volatile organic compound photoionization detector for detecting the concentration of volatile organic compounds in air (non-mine working environment). Overview
Working principle of volatile organic compound photoionization detector (hereinafter referred to as instrument): Photoionization (PID) uses an ultraviolet radiation with an energy of 106ey (11.7eV) as a light source. This high-energy ultraviolet radiation ionizes all organic and organic matter in the air, so as to maintain the basic components of the air, N, O, CO, H co, @ the ionization of the substance is much higher than 10.6eV or 11.7eV), the substance being measured enters the ionization
to generate positively charged ions and negatively charged electrons
before the external light stove, the original stable substructure is ionized, and the negative electric field
is small, so we can know the depth of the substance in the air. The instrument mainly produces pear-like system, and the light is ionized. Unless you know what kind of gas is being measured, the total content of volatile organic catalysts, 3
Metrological characteristics
Measurement of the maximum bacteria
mole fraction
xeV0C): ~2 0
3.2 Indication error
Allowable error limit
3.3 Repeatability
$10%FS.
Relative standard deviation should
3.4 ​​Response time
Response time should be ≤20 sc
3.5 Drift
3.5.1 Zero drift
The detection concentration displayed by the general instrument indicates all ME detected
The instrument zero drift should not exceed half of the allowable error limit. 3.5.2 Range drift
The instrument range drift should not exceed half of the allowable error limit. Note: Since the instrument is only calibrated but not judged, the above requirements are for reference only. Calibration conditions
4.1 Environmental conditions
4.1.1 Ambient temperature: (0~40)T
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4.1.2 Relative humidity: ≤85%.
JJF 1172—2007
4,1.3 There should be no electromagnetic field and interfering gas that may affect the normal operation of the instrument. 4.2 Standards and other equipment
4.2.1 Gas standard substances
The instrument is generally calibrated with isobutylene standard gas in the air (hereinafter referred to as standard gas): If the instrument is used to measure a certain volatile organic compound, it needs to be calibrated with the same gas standard substance as the measured one. The expanded uncertainty of isobutylene standard gas in the air or the specific volatile organic compound standard gas should not be greater than 3.0% (k=2)
4.2.2 Zero point gas
Clean air.
4.2.3 Flow controller
It consists of two gas flow meters. As shown in Figure 1. Controller outlet
Standard push gas
Flow controller inlet
Flow meter
Will pass the flow
Humble controller
Figure 1 Instrument calibration block diagram
Gas flow meter range: (0-1000) nL/min, accuracy level not less than level 4. 4.2.4 Stopwatch: resolution 0.1s
5 Calibration items and calibration methods
5.1 Adjustment of the instrument
The instrument to be calibrated
Empty
5.1.1 The display of the instrument should be clear and complete. All regulator components should be able to work normally, and all tight rings should not be loose. The instrument should not have any external damage that affects its normal operation. 5.1.2 Preheat and stabilize the instrument and calibrate the zero point and range according to the requirements of the instrument instruction manual. When calibrating the instrument, connect the standard gas, flow controller and the instrument to be calibrated as shown in Figure 1. Use the flow controller to control different gas flows according to the different sampling methods of the instrument to be calibrated. When calibrating a diffusion instrument, the flow rate should be based on the requirements of the instrument manual. If there is no clear requirement in the instrument manual, it is generally controlled within the range of (200 ± 50) mL/min. When calibrating an inhalation instrument, it must be ensured that the bypass flowmeter in the flow controller has a flow discharge. 5.2 Error in value
Pass standard gas with concentrations of approximately 20%, 50% and 80% of the full volume in sequence. Record the stable indication after the standard gas passes through the instrument. Repeat the measurement for each concentration three times in a row. Calculate the indication error of each concentration point on the instrument screen according to formula (1): 4. AA × 100%
Where: A is the arithmetic mean of the instrument display values ​​for three times for each concentration; A is the corresponding standard gas concentration value; R is the range.
htt
5.3 Repeatability
JF 1172—2007
Pass a standard gas with a concentration of about 50% of the full scale, and record the instrument display value A after it stabilizes. Repeat the above measurement 6 times. The repeatability is expressed as the relative standard deviation of a single measurement. The instrument's repeatability is calculated according to formula (2) 5.E(A,-A)
Where: A: —the display value of the instrument for the first measurement; A is the arithmetic mean of the instrument display value
-number of measurements (n=6)
5.4 Ringing time
Pass a standard gas with a concentration of about 50% of the full scale, and read the instrument display value after it stabilizes. Remove the standard gas and pass the zero gas. After the instrument display value stabilizes, pass the standard gas of the above concentration again, and use a stopwatch to record the time from the moment the standard gas is passed to the moment when 0% of the stable value is reached. Repeat the measurement 3 times and take the average value of the 3 recorded times as the instrument's error response.
5.5 Drift
Introduce zero gas, wait for the instrument to stabilize, record the instrument display value A, then introduce standard gas with a concentration of about 50% of the full scale, after the instrument stabilizes, record the instrument display value A, and drain the standard gas. The portable instrument runs continuously for 1 hour, repeating the above steps every 15 minutes, and the fixed instrument runs continuously for 4 hours, repeating the above steps every 1 hour, and recording the instrument display value A and A (i~1, 2, 3, 4) at the same time. Calculate the zero drift according to formula (3), and take the one with the largest absolute value as the instrument's zero drift. Aa = AuAd×100%
Calculate the range drift according to formula (4), and take the one with the largest absolute value A as the instrument's range drift. A
The calibration result is
(As.- A) - (An.- A) × 100%
The calibration result should be printed on the back of the calibration certificate or calibration report. The calibration certificate or report shall include the following information: a) Title, i.e. "Calibration Certificate" or "Calibration Report"; b) Name and address of the laboratory; c) Location where the calibration was carried out (if the calibration is not carried out within the laboratory); d) Special identification of the certificate or report (such as number), identification of the obtained pages and the total number of pages; e) Name and address of the sending unit;
Description of the object to be calibrated;
|Confirmation identification:
|) Date of calibration, if it is related to the validity and application of the calibration results, the date of receipt of the object to be calibrated should be stated; h) If it is related to the validity and application of the calibration results, the sampling procedure should be explained; 3) Identification of the technical specification on which the calibration is based, including name and code: 3
ht
JJF 1172-207
3) Traceability and validity of the measurement standards used in this calibration: K) Description of the calibration environment;
1) Description of the calibration results and their measurement uncertainty; m) Signature, position or equivalent identification of the issuer of the calibration certificate or calibration report: and issue date; n) Statement that the calibration result is only valid for the calibrated object; o) No partial reproduction of the certificate or report is allowed without the written approval of the laboratory. 7 Recalibration interval
The recommended calibration cycle of the instrument is 1.
If there is any problem with the test data of the instrument, the instrument should be calibrated in time after the major parts are replaced and repaired.
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Appendix A
Testing Unit
Instrument Model
Manufacturer
Calibration Environment Excess
1 Instrument Calibrated Status
2 Instrument Adjustment
Indication Error
Standard Gas Concentration Value
Repeatability
Standard Gas Expansion
Response Time
Standard Gas Concentration!
Centrifugal Point Drift:
JJF 1172--2(H07
Calibration record of volatile organic compound photoionization detector Measurement range
Instrument number
Before calibration
After calibration: Normal; Others:
Positive
Correction value 1
Indication value 1
Expanded uncertainty of indication error:
Calibrator
Indication value 5
Response time/s
Measurement drift:
Verifier
Calibration date:
Indication error
Repeatability
Appendix B
Calibration items
Indication error
Repeatability
Response time
Zero point shift
Range drift
JJF1172—2007
Calibration results in the calibration certificate or calibration reportCalibration results
Standard filling gas
Measurement uncertainty of this calibration:
Product Partner Network
Instrument display value
Value error
Appendix C
C.1 Overview
JIF 1172—2007
Uncertainty evaluation of calibration results
The indication error calibration of the volatile organic compound photoionization detector (hereinafter referred to as the instrument) is to determine the indication error of the instrument under test by comparing the input standard gas with the display value of the instrument under test. The following is the uncertainty evaluation of the indication error calibration result of an instrument with a range of 0~2000×10-“. C.2 Measurement model
Where: Indication error
-Arithmetic mean of the display value:
T. Standard gas concentration value;
R Instrument full scale value.
C.3 Evaluation of standard uncertainty
C,3,1 Evaluation of standard uncertainty u()
- ×100%
The uncertainty of the transmission period mainly comes from the non-repeatability of the instrument measurement. The measurement series can be obtained through continuous measurement and evaluated using the Class A evaluation method. An instrument with a range of 0~2000×10-6 was selected for the test. The instrument was continuously measured under the same conditions using standard gases with concentration values ​​of 400×106, 100×10-6, and 1600×10- mole fractions, and the measurement series was obtained as shown in Table C.1.
Measurement series values ​​at each point of the instrument
Standard gas liquid value (1.)
/×10-6
Indication!
1×106
Indication 2
/× 10-6
Mercury value3
/×10-6
Indication value4
/×10\6
Indication valueS
/×10~6
Flag killing 6
1x10°6
Table C.1, according to formula (C.2), (C.3), calculate the arithmetic mean of each point and the standard deviation of a single experiment, 1
Specific data see Table C.2.
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JJF 1172--2007
Table.2 Average value of measurement series and standard deviation of single experiment Measurement results Standard gas concentration value (A)
400×10-6
1 000×10-6
1 600×10-6
Average value of measurement series ()
414,7×10-6
1062.2×10-6bzxz.net
1 551.3×10-6
Standard deviation of single experiment (s)
5.5×10-6
4.6×10~6
In order to make the evaluation result reliable, the maximum value of the single experiment standard deviation, that is, 1000×10~, is taken to evaluate the uncertainty of measurement repeatability.
-5-5X-1
Due to the actual measurement situation,
measurement results, the measurement can be obtained:
, take the arithmetic mean value of the measurement content as the measurement, measure three times continuously under repeatability conditions,
C.3.2 Standard uncertainty (/,) evaluation input. The main source of uncertainty is the uncertainty of the standard gas concentration. Since the absolute uncertainty of the standard gas value with a concentration of 1600×10~* is reliable, the uncertainty of the standard gas value with a concentration of 1600×10 is used to evaluate the uncertainty. The uncertainty of the standard gas used in the above test is 3.0%, including the uncertainty of Qingjia et al. 2. Then we can get:
u(t,)
C.3.3 Evaluation of the uncertainty of the synthetic standard
Sensitivity coefficient
Mathematical model
Sensitivity coefficient:
C.3.3.2 Summary table of standard uncertainty
Summary table of standard uncertainty of input quantityC.3
Standard uncertainty
Source of uncertainty
Measurement uncertainty of the instrument
Uncertainty of the standard gas
06 ×3%
4 ×106
Summary of standard uncertainty
Standard uncertainty value
3.2×10-6
24×10
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×100%
-1×100%
1×3.2×10-6
×24×10-6- A) × 100%
The calibration result should be printed on the back of the calibration certificate or calibration report. The calibration certificate or report should include the following information: a) Title, namely "Calibration Certificate" or "Calibration Report"; b) Name and address of the laboratory;
) Place where the calibration was carried out (if the calibration is not carried out within the laboratory); d) Special identification of the certificate or report (such as number), identification of the obtained page and the total number of pages; e) Name and address of the sending unit;
Description of the object to be calibrated;
) Date of calibration, if it is related to the validity and application of the calibration results, the date of receipt of the object to be calibrated should be stated;
h) If it is related to the validity and application of the calibration results, the sampling procedure should be explained; 3) Identification of the technical specification on which the calibration is based, including name and code: 3
ht
JJF 1172-207
3) Traceability and validity of the measurement standards used in this calibration: K) Description of the calibration environment;
1) Description of the calibration results and their measurement uncertainty; m) Signature, position or equivalent identification of the issuer of the calibration certificate or calibration report: and issue date; n) Statement that the calibration result is only valid for the calibrated object; o) No partial reproduction of the certificate or report is allowed without the written approval of the laboratory. 7 Recalibration interval
The recommended calibration cycle of the instrument is 1.
If there is any problem with the test data of the instrument, the instrument should be calibrated in time after the major parts are replaced and repaired.
All Products Partner Network
Appendix A
Testing Unit
Instrument Model
Manufacturer
Calibration Environment Excess
1 Instrument Calibrated Status
2 Instrument Adjustment
Indication Error
Standard Gas Concentration Value
Repeatability
Standard Gas Expansion
Response Time
Standard Gas Concentration!
Centrifugal Point Drift:
JJF 1172--2(H07
Calibration record of volatile organic compound photoionization detector Measurement range
Instrument number
Before calibration
After calibration: Normal; Others:
Positive
Correction value 1
Indication value 1
Expanded uncertainty of indication error:
Calibrator
Indication value 5
Response time/s
Measurement drift:
Verifier
Calibration date:
Indication error
Repeatability
Appendix B
Calibration items
Indication error
Repeatability
Response time
Zero point shift
Range drift
JJF1172—2007
Calibration results in the calibration certificate or calibration reportCalibration results
Standard filling gas
Measurement uncertainty of this calibration:
Product Partner Network
Instrument display value
Value error
Appendix C
C.1 Overview
JIF 1172—2007
Uncertainty evaluation of calibration results
The indication error calibration of the volatile organic compound photoionization detector (hereinafter referred to as the instrument) is to determine the indication error of the instrument under test by comparing the input standard gas with the display value of the instrument under test. The following is the uncertainty evaluation of the indication error calibration result of an instrument with a range of 0~2000×10-“. C.2 Measurement model
Where: Indication error
-Arithmetic mean of the display value:
T. Standard gas concentration value;
R Instrument full scale value.
C.3 Evaluation of standard uncertainty
C,3,1 Evaluation of standard uncertainty u()
- ×100%
The uncertainty of the transmission period mainly comes from the non-repeatability of the instrument measurement. The measurement series can be obtained through continuous measurement and evaluated using the Class A evaluation method. An instrument with a range of 0~2000×10-6 was selected for the test. The instrument was continuously measured under the same conditions using standard gases with concentration values ​​of 400×106, 100×10-6, and 1600×10- mole fractions, and the measurement series was obtained as shown in Table C.1.
Measurement series values ​​at each point of the instrument
Standard gas liquid value (1.)
/×10-6
Indication!
1×106
Indication 2
/× 10-6
Mercury value3
/×10-6
Indication value4
/×10\6
Indication valueS
/×10~6
Flag killing 6
1x10°6
Table C.1, according to formula (C.2), (C.3), calculate the arithmetic mean of each point and the standard deviation of a single experiment, 1
Specific data see Table C.2.
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JJF 1172--2007
Table.2 Average value of measurement series and standard deviation of single experiment Measurement results Standard gas concentration value (A)
400×10-6
1 000×10-6
1 600×10-6
Average value of measurement series ()
414,7×10-6
1062.2×10-6
1 551.3×10-6
Standard deviation of single experiment (s)
5.5×10-6
4.6×10~6
In order to make the evaluation result reliable, the maximum value of the single experiment standard deviation, that is, 1000×10~, is taken to evaluate the uncertainty of measurement repeatability.
-5-5X-1
Due to the actual measurement situation,
measurement results, the measurement can be obtained:
, take the arithmetic mean value of the measurement content as the measurement, measure three times continuously under repeatability conditions,
C.3.2 Standard uncertainty (/,) evaluation input. The main source of uncertainty is the uncertainty of the standard gas concentration. Since the absolute uncertainty of the standard gas value with a concentration of 1600×10~* is reliable, the uncertainty of the standard gas value with a concentration of 1600×10 is used to evaluate the uncertainty. The uncertainty of the standard gas used in the above test is 3.0%, including the uncertainty of Qingjia et al. 2. Then we can get:
u(t,)
C.3.3 Evaluation of the uncertainty of the synthetic standard
Sensitivity coefficient
Mathematical model
Sensitivity coefficient:
C.3.3.2 Summary table of standard uncertainty
Summary table of standard uncertainty of input quantityC.3
Standard uncertainty
Source of uncertainty
Measurement uncertainty of the instrument
Uncertainty of the standard gas
06 ×3%
4 ×106
Summary of standard uncertainty
Standard uncertainty value
3.2×10-6
24×10
All product partner network h
×100%
-1×100%
1×3.2×10-6
×24×10-6- A) × 100%
The calibration result should be printed on the back of the calibration certificate or calibration report. The calibration certificate or report should include the following information: a) Title, namely "Calibration Certificate" or "Calibration Report"; b) Name and address of the laboratory;
) Place where the calibration was carried out (if the calibration is not carried out within the laboratory); d) Special identification of the certificate or report (such as number), identification of the obtained page and the total number of pages; e) Name and address of the sending unit;
Description of the object to be calibrated;
) Date of calibration, if it is related to the validity and application of the calibration results, the date of receipt of the object to be calibrated should be stated;
h) If it is related to the validity and application of the calibration results, the sampling procedure should be explained; 3) Identification of the technical specification on which the calibration is based, including name and code: 3
ht
JJF 1172-207
3) Traceability and validity of the measurement standards used in this calibration: K) Description of the calibration environment;
1) Description of the calibration results and their measurement uncertainty; m) Signature, position or equivalent identification of the issuer of the calibration certificate or calibration report: and issue date; n) Statement that the calibration result is only valid for the calibrated object; o) No partial reproduction of the certificate or report is allowed without the written approval of the laboratory. 7 Recalibration interval
The recommended calibration cycle of the instrument is 1.
If there is any problem with the test data of the instrument, the instrument should be calibrated in time after the major parts are replaced and repaired.
All Products Partner Network
Appendix A
Testing Unit
Instrument Model
Manufacturer
Calibration Environment Excess
1 Instrument Calibrated Status
2 Instrument Adjustment
Indication Error
Standard Gas Concentration Value
Repeatability
Standard Gas Expansion
Response Time
Standard Gas Concentration!
Centrifugal Point Drift:
JJF 1172--2(H07
Calibration record of volatile organic compound photoionization detector Measurement range
Instrument number
Before calibration
After calibration: Normal; Others:
Positive
Correction value 1
Indication value 1
Expanded uncertainty of indication error:
Calibrator
Indication value 5
Response time/s
Measurement drift:
Verifier
Calibration date:
Indication error
Repeatability
Appendix B
Calibration items
Indication error
Repeatability
Response time
Zero point shift
Range drift
JJF1172—2007
Calibration results in the calibration certificate or calibration reportCalibration results
Standard filling gas
Measurement uncertainty of this calibration:
Product Partner Network
Instrument display value
Value error
Appendix C
C.1 Overview
JIF 1172—2007
Uncertainty evaluation of calibration results
The indication error calibration of the volatile organic compound photoionization detector (hereinafter referred to as the instrument) is to determine the indication error of the instrument under test by comparing the input standard gas with the display value of the instrument under test. The following is the uncertainty evaluation of the indication error calibration result of an instrument with a range of 0~2000×10-“. C.2 Measurement model
Where: Indication error
-Arithmetic mean of the display value:
T. Standard gas concentration value;
R Instrument full scale value.
C.3 Evaluation of standard uncertainty
C,3,1 Evaluation of standard uncertainty u()
- ×100%
The uncertainty of the transmission period mainly comes from the non-repeatability of the instrument measurement. The measurement series can be obtained through continuous measurement and evaluated using the Class A evaluation method. An instrument with a range of 0~2000×10-6 was selected for the test. The instrument was continuously measured under the same conditions using standard gases with concentration values ​​of 400×106, 100×10-6, and 1600×10- mole fractions, and the measurement series was obtained as shown in Table C.1.
Measurement series values ​​at each point of the instrument
Standard gas liquid value (1.)
/×10-6
Indication!
1×106
Indication 2
/× 10-6
Mercury value3
/×10-6
Indication value4
/×10\6
Indication valueS
/×10~6
Flag killing 6
1x10°6
Table C.1, according to formula (C.2), (C.3), calculate the arithmetic mean of each point and the standard deviation of a single experiment, 1
Specific data see Table C.2.
All Products Partner Network h
JJF 1172--2007
Table.2 Average value of measurement series and standard deviation of single experiment Measurement results Standard gas concentration value (A)
400×10-6
1 000×10-6
1 600×10-6
Average value of measurement series ()
414,7×10-6
1062.2×10-6
1 551.3×10-6
Standard deviation of single experiment (s)
5.5×10-6
4.6×10~6
In order to make the evaluation result reliable, the maximum value of the single experiment standard deviation, that is, 1000×10~, is taken to evaluate the uncertainty of measurement repeatability.
-5-5X-1
Due to the actual measurement situation,
measurement results, the measurement can be obtained:
, take the arithmetic mean value of the measurement content as the measurement, measure three times continuously under repeatability conditions,
C.3.2 Standard uncertainty (/,) evaluation input. The main source of uncertainty is the uncertainty of the standard gas concentration. Since the absolute uncertainty of the standard gas value with a concentration of 1600×10~* is reliable, the uncertainty of the standard gas value with a concentration of 1600×10 is used to evaluate the uncertainty. The uncertainty of the standard gas used in the above test is 3.0%, including the uncertainty of Qingjia et al. 2. Then we can get:
u(t,)
C.3.3 Evaluation of the uncertainty of the synthetic standard
Sensitivity coefficient
Mathematical model
Sensitivity coefficient:
C.3.3.2 Summary table of standard uncertainty
Summary table of standard uncertainty of input quantityC.3
Standard uncertainty
Source of uncertainty
Measurement uncertainty of the instrument
Uncertainty of the standard gas
06 ×3%
4 ×106
Summary of standard uncertainty
Standard uncertainty value
3.2×10-6
24×10
All product partner network h
×100%
-1×100%
1×3.2×10-6
×24×10-62×10-6
×24×10-62×10-6
×24×10-62×10-6
×24×10-62×10-6
×24×10-63×10-6
Standard deviation of single experiment (s)
5.5×10-6
4.6×10~6
In order to make the evaluation result reliable, the maximum value of the single experiment standard deviation, that is, 1000×10~, is taken to evaluate the uncertainty of measurement repeatability.
-5-5X-1
Due to the actual measurement situation,
measurement results, the measurement can be obtained:
, take the arithmetic mean value of the measurement as the measurement, measure three times continuously under repeatability conditions,
C.3.2 Standard uncertainty (/,) evaluation input. The main source of uncertainty is the uncertainty of the standard gas concentration. Since the absolute uncertainty of the standard gas value with a concentration of 1600×10~* is reliable, the uncertainty of the standard gas value with a concentration of 1600×10 is used to evaluate the uncertainty. The uncertainty of the standard gas used in the above test is 3.0%, including the uncertainty of Qingjia et al. 2. Then we can get:
u(t,)
C.3.3 Evaluation of the uncertainty of the synthetic standard
Sensitivity coefficient
Mathematical model
Sensitivity coefficient:
C.3.3.2 Summary table of standard uncertainty
Summary table of standard uncertainty of input quantityC.3
Standard uncertainty
Source of uncertainty
Measurement uncertainty of the instrument
Uncertainty of the standard gas
06 ×3%
4 ×106
Summary of standard uncertainty
Standard uncertainty value
3.2×10-6
24×10
All product partner network h
×100%
-1×100%
1×3.2×10-6
×24×10-63×10-6
Standard deviation of single experiment (s)
5.5×10-6
4.6×10~6
In order to make the evaluation result reliable, the maximum value of the single experiment standard deviation, that is, 1000×10~, is taken to evaluate the uncertainty of measurement repeatability.
-5-5X-1
Due to the actual measurement situation,
measurement results, the measurement can be obtained:
, take the arithmetic mean value of the measurement as the measurement, measure three times continuously under repeatability conditions,
C.3.2 Standard uncertainty (/,) evaluation input. The main source of uncertainty is the uncertainty of the standard gas concentration. Since the absolute uncertainty of the standard gas value with a concentration of 1600×10~* is reliable, the uncertainty of the standard gas value with a concentration of 1600×10 is used to evaluate the uncertainty. The uncertainty of the standard gas used in the above test is 3.0%, including the uncertainty of Qingjia et al. 2. Then we can get:
u(t,)
C.3.3 Evaluation of the uncertainty of the synthetic standard
Sensitivity coefficient
Mathematical model
Sensitivity coefficient:
C.3.3.2 Summary table of standard uncertainty
Summary table of standard uncertainty of input quantityC.3
Standard uncertainty
Source of uncertainty
Measurement uncertainty of the instrument
Uncertainty of the standard gas
06 ×3%
4 ×106
Summary of standard uncertainty
Standard uncertainty value
3.2×10-6
24×10
All product partner network h
×100%
-1×100%
1×3.2×10-6
×24×10-6
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