We are offering fixed gas detector. • high precision & durability • reliable performance with its very low deviation tolerances • automatic sensor error detection • set relay outputs for low/high alarm levels • led display • temperature compensation • automatic zero calibration function • 4-20ma analog signal output in compliance with all 4-20ma control systems • rs485 compatible • remote calibration without opening its cover, via its infrared remote control device • ex-proof design for use in all combustible, flammable and/or explosive environments.