... methodsnatural diffused Detection range 12-15m2Main features1. measurement accuracy.Sensitive sensors use of imported components, with high accuracy, strong interchangeability, ... 6 gas alarm controller Detection range :12-15 square, combustible gas catalytic combustion sensor (% LEL), toxic gases using electrochemical sensors (ppm, ... C place; 5, strong electromagnetic fields. Hydrogen Gas Leakage Alarm