Table of Contents

Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Equipment used for calibration and testing and its
configuration
4.1 Configuration of test apparatus
4.2 Supplying system of test gas
4.3 Test apparatus
5 Method of calibration and testing
5.1 Calibration condition and testing condition
5.2 Calculation method of density of gas
5.3 Calculation method of deviation (instrumental
error)
5.4 Calculation method of uncertainty factor
6 Calculation of uncertainty of correction factor of
device under test and calculation of deviation
(instrumental error) of flow rate
6.1 General
6.2 In the case of wet gas meter
6.3 In the case of flowmeter having pulsed output
6.4 In the case of critical flow nozzle (sonic nozzle)
6.5 In the case of restriction flowmeter
6.6 In the case of piston prover
6.7 In the case of bell prover
6.8 In the case of having voltage output and current
output
6.9 When calibration and testing are performed based
on visual observation
6.10 When calibration flow rate and testing flow rate
are expanded using two or more reference standard
flowmeters
6.11 In the case of calibration and testing with dry
air and gases other than humid air
7 Report of results
7.1 In the case of calibration
7.2 In the case of testing
Annex A (informative) - Budget table for uncertainty
calculation of correction factor of device under
test
Annex B (informative) - Precautions when using a critical
flow nozzle (sonic nozzle)
Annex C (informative) - Relation between correction
factor of flowmeter and Reynolds number
Bibliography

Abstract

Describes the procedures of calibration and testing and the calculation method of uncertainty and deviation for a gas flowmeter using the flowmeter with ensured traceability as a reference standard.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Japanese Standards Association
Pages
ISBN
Supersedes	JIS B 7556:2003