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Standard gases used for Transaction Certification under the Measurement Act

Transaction Certification requires standard gases specified by the national traceability system under the Measurement Act. SUMITOMO SEIKA as an Accredited Calibration Laboratory can supply JCSS standard gases with the inspection certificate, which are approved to be traceable to the national standard.

 

JCSS Standard Gases

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Kind Range Uncertainty ( % )
First class standard gas Second class standard gas
CH4 - Air 1 vol ppm ~ 50 vol ppm ± 1.0 ± 2.0
C3H8 - Air 3.5 vol ppm ~ 500 vol ppm ± 1.0 ± 2.0
C3H8 - N2 150 vol ppm ~ 1.5 vol % ± 1.0 ± 2.0
CO - N2 3 vol ppm ~ 50 vol ppm ± 1.5 ± 2.5
> 50 vol ppm ~ 15 vol % ± 1.0 ± 2.0
CO2 - N2 300 vol ppm ~ 16 vol % ± 1.0 ± 2.0

NO - N2

0.5 vol ppm ~ 1vol ppm   ± 5.0
> 1 vol ppm ~ 30 vol ppm ± 1.5 ± 2.5
> 30 vol ppm ~ 5 vol % ± 1.0 ± 2.0
NO2 - Air 5 vol ppm ~ 50 vol ppm ± 5.0  
O2 - N2 1 vol % ~ 25 vol % ± 1.0 ± 2.0

SO2 - N2

0.5 vol ppm ~ 1 vol ppm   ± 5.0
> 1vol ppm ~ 50 vol ppm ± 1.5 ± 2.5
> 50 vol ppm ~ 1 vol % ± 1.0 ± 2.0

Kinds and quality zero point adjustment standard gases ( zero gases )

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Kind Quality
Zero point adjustment standard gases for exhaust source ( Air or nitrogen )

Gases whose coexistent components are 0.5 vol ppm max. of CH4. 1.0 vol ppm max. of CO, 1.0 vol ppm max. of CO2, 0.1 vol ppm max. of SO2 and 0.1 vol ppm max. of NO+NO2.

Zero point adjustment standard gases for environment monitoring ( Air ) Gases whose coexistent components are 0.005 vol ppm max. of SO2 and 0.005 vol ppm max. of NO+NO2.