... sensor life Product Overview: KQ500-O2 fixed oxygen gas monitor (also called gas monitor): with 6 years experience in designing ... , petrol, petrifaction, chemistry, light industry, coking, municipal administration, gas, pharmacy, sewage dealing and many other special industries and fields ... gas0-100%LEL1%LEL≤30s3-5yearsAs for unlisted detected gas and measuring range, please contact with our company