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What does the iBut unit in the combustible gas detector measure, in PPM? For other gases, the methane unit is expressed as a percentage, while the oxygen unit is expressed as a volume ratio
1. Combustible gas explosion detectors typically use LEL% as the unit of measurement, rather than PPM; PPM is generally used for measuring toxic gases； 2. iBut may refer to isomeric-butylene, that is, isobutylene. 3. So are you talking about a four-in-one portable detector for flammable and toxic substances?
Agree with the judgment above. It would be best for the original poster to verify things by referring to the actual instruments they are using, along with the user manuals and relevant documentation available at their workplace. Safety matters cannot be taken lightly.