Measurement standards name precision pressure gauge calibration device
Measurement standards responsible person
Build the standard unit name (seal)
Fill in the date November 3, 2010
Content
One of the establishment of the measurement standards for the purpose of ... .............................. ........................... (1)
II, The Working Principle of Measurement Standards and Their Composition ........................... ............... (1)
Third, the measurement standard and the main supporting equipment ......... .............................. .........(2)
Four, the main technical indicators of measurement standards ............... .............................. (3)
V. Environmental conditions ........................ .............................. ...............(3)
VI. Measurement standards of traceability and transmission of the value of the block diagram ......... .............................. ......(4)
VII. Repeatability test of measurement standards .................. .............................. .........(5)
VIII. Stability test of measurement standards ............... .............................. ...............(6)
nine, the test or calibration results of the measurement uncertainty assessment ...... .............................. ...(7)
X. Verification of test or calibration results ..................... .............................. ......(8)
XI.CONCLUSION .................. .............................. .............................. (9)
XII. Additional Notes ........................ .............................. .....................(9)
I. Purpose of Establishing Measurement Standards
The purpose of establishing measurement standards is to make The purpose of the establishment of measurement standards is to transfer the measurement value of the factory's pressure gauges, and more effectively improve the factory's pressure gauges of the standard degree to determine the correct use of pressure gauges.
Second, the working principle of the measurement standard and its composition
1, the working principle: spring tube under pressure and vacuum, resulting in elastic deformation caused by the displacement of the tube end, and its displacement through the mechanical transmission mechanism to amplify the transmission to the indicator device, and then by the pointer in the engraving by the legal unit of measurement on the dial to indicate the measured pressure or vacuum value.
2, schematic diagram
Three, measurement standard and the main supporting equipment
Measurement standard device name Model No. Measuring range Uncertainty
Or accuracy level
Or the maximum permissible error Manufacturer and
Export No. Accreditation or
Calibration body Accreditation cycle or re-schooling intervals
Precision Pressure Gauge Y-160 (0.5mm, 0.5mm, 0.5mm) Precision pressure gauge Y-160 (0-2.5)MPa 0.4 grade Luohe Instrumentation Factory 96 2011.2.8 Municipal Bureau of Metrology one year
Precision pressure gauge Y-160 (0-6)MPa 0.4 grade Henan Bureau of Metrology 106 2011.2.8 Municipal Bureau of Metrology one year
Precision pressure gauge Y-160 (0-16)MPa 0.4 grade Xi'an Instrumentation Factory 412 2011.2.8 Municipal Bureau of Metrology one year
Precision pressure gauge Y-160 (0-16)MPa 0.4 grade Xi'an Instrumentation Factory 412 2011.2.8 Municipal Bureau of Weights and Measures one year
Precision Pressure Gauge Y-160 (0-25)MPa 0.4 Henan Bureau of Weights and Measures Supervision1625 2011.5.16 Municipal Bureau of Weights and Measures one year
Precision Pressure Gauge Y-160 (0-60)MPa 0.4 Henan Bureau of Weights and Measures Supervision3336 2011.2.8 Municipal Bureau of Weights and Measures one year One year
Main supporting equipment Pressure gauge calibrator LY-100 (0-100)MPa Xuzhou Xinteli 046
Four, the main technical indicators of the measurement standard
Model:
Measuring range:
Precision level:
Environmental conditions: -40 ~ 70 ℃, relative humidity of not more than 85%.
Temperature effects:
The use of temperature deviation of 20 ± 5 ℃, not more than 0.4%/10 ℃.
V. Environmental conditions
No. Item Requirements Actual Condition Conclusion
1 Temperature 20 ± 5 ℃ 22 qualified
2 Humidity 50-80% 70% qualified
3
4
5
6
6
6, the measurement of the standard of measurement traceability and transmission of the block diagram
VII. Repeatability test of measurement standards
Any one (0-60) MPa general pressure gauge, accuracy class 1.6. p>4 40.00 0.18 0.0324
5 39.60 -0.22 0.0484
6 40.00 0.18 0.0324
7 39.60 -0.22 0.0484
8 40.00 0.18 0.0324
9 39.60 -0.22 0.0484
10 40.00 0.18 0.0324
= =39.82MPa
S= =0.199MPa
Take the 0.4 level precision pressure gauge, No. 3336, measuring range (0-60)MPa, sent to the higher legal metrology organizations to test data comparison, the results are as follows:
< p>2005 2006 Change 2006 2007 Change40.10 40.10 0.10 40.10 40.10 40.10 0.10
2008 2009 Change 2009 2010 Change
40.10 40.10 0.10 39.90 39.90 - 0.10
40.10 40.10 0.10 39.90 - 0.10 - 0.10 - 0.10 - 0.10 - 0.10 - 0.10 - 0.10 - 0.10 - 0.10 - 0.10 - 0.10 0.10
2010 2011 Change
39.85 38.85 -0.15
Conforms to the provisions of JJG52-99 spring tube pressure gauge, pressure vacuum gauge calibration regulations.
Eight, the stability of the measurement standard assessment
Nine, calibration or calibration results of the measurement uncertainty assessment
1, measurement method
With 0.4 level precision pressure gauge, dual-use calibrator calibration of 1.6 level (the following) pressure gauge measurement range (0-60) MPa.
2, the establishment of mathematical models
Pressure gauge error e =
In which - the value of the test
- the standard value
I. Standard uncertainty component assessment
1, the uncertainty introduced by the repeatability of the test value
1, the uncertainty introduced by the test value
2. Uncertainty component
Take 1.6 level of the examined table (0-60) MPa repeated measurements 10 times, obtained
= s = 0.199MPa
2, due to temperature inaccuracy introduced by the calibration uncertainty component, according to the temperature additive error of 0.0004 estimates, the laboratory temperature allowable error = ± 10 ℃, the interval of half-width of 10 ℃, uniformly distributed,
= 0.0004, the laboratory temperature error = ± 10 ℃, half-width of 10 ℃, uniformly distributed,
= 0.199MPa. p>
=0.0004 / =0.010 MPa
3, the standard meter and the meter pointer between the liquid column height difference introduced uncertainty component = ,take g = 9.793m/ ,medium for the transformer oil =0.86 × kg/m, uniform distribution, estimated = ± 0.01m, so
=84/ Pa = 48 Pa = 0.000048 MPa
Synthetic standard uncertainty
= + + MPa
≈ 0.209MPa
Third, the extended uncertainty
U = 2 × 0.119 = 0.418 MPa (K = 2)
Ten, the verification of the test or calibration results
Verified by the method of transferring the comparison
Either one of them is the most important. p>
Select a (0-60) MPa general pressure gauge, accuracy level of 1.6, the maximum allowable error of 0.96 MPa, sent to the higher authorities of the 20MPa, 40MPa two points of the calibration test, and the device calibration results compared to the results are as follows:
The inspected part of the city testing center results of the device calibration results Comparison of the results (the difference)
20MPa 19.80 19.60 0.20
40MPa 39.60 39.60 0.00
The maximum difference of the comparison result is 0.20MPa ≤ U, i.e.
≤ U
Conforms to the examination specification.
Xi, conclusion
The device standard synthesis standard uncertainty of 0.209MPa, extended uncertainty of 0.418MPa, repeatability error of 0.199 MPa. In line with the JJG52-99 spring tube pressure gauge, pressure and vacuum gauge verification procedures, can carry out the company's work in the temperature gauge verification work.
Twelve, additional instructions
1, the test procedures: JJG52-99 spring tube pressure gauge, pressure vacuum gauge test procedures.
2, operating procedures: check the general operating procedures for pressure gauges.
3, calibration certificate, original records.
2, operating procedures: checking the general pressure gauge operating procedures.