JIS B 7556:2016

Introduction1 Scope2 Normative references3 Terms and definitions4 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 apparatus5 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 factor6 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 air7 Report of results 7.1 In the case of calibration 7.2 In the case of testingAnnex A (informative) - Budget table for uncertainty calculation of correction factor of device under testAnnex B (informative) - Precautions when using a critical flow nozzle (sonic nozzle)Annex C (informative) - Relation between correction factor of flowmeter and Reynolds numberBibliography

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.

2016 [20/07/2016]2008(R2012) [22/10/2012]2008 [20/01/2008]2003 [20/11/2003]