The concentration setting range of the People’s Republic of China standard GB15322 "Combustible Gas Detector":
Combustible gas: low limit 1%LEL~25%LEL high limit 50%
Artificial gas: (hydrogen) Low limit 125PPM-750PPM High limit 1250PPM
Artificial gas: (carbon monoxide) Low limit 50PPM-300PPM High limit 500PPM
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