KM-840-O2 Portable Oxygen gas detector with voice alarm with safe and reliable quality. It’s with the diffusion sampling mode, can be connected with the external pump. The portable gas detector increases the security for the personnel working. Gas Type : Oxygen O2 Sensor Type : Electrochemical sensor Sensor Life : 2 - 3 years (Under normal environment conditions). Measuring Ranges : O2: 0~30%VOL Display Information: Gas types, Concentration value, Concentration unit, Time, Battery status, Alarm status, etc. Display : Large screen LCD Alarm Storage :With alarm data storage function, can review the data from the detector. . Sampling mode : Diffusion sampling (Available for connection with external pump) Alarm Mode : Audible-visual-vibration alarm, sound = 75dB Power Supply : 3.7V, 1800mAh rechargeable lithium battery, continuous working period over 10 hours. Explosion-proof Grade : Ex ib IIB T3 Protection Grade : IP65 Working Environment Working Temperature: -20°C~50°C Working Humidity: 0-95%RH (non-condensing) Body Material : ABS and PC Package : Aluminum alloy box Dimensions : 140*73*32mm Weight :300g (with charger) Warranty : 1 years APPLICATIONS: The portable gas detector used in the gas safety inspection and alarm for industrial scene, such as petroleum refinery, chemical plants, LPG stations, boiler rooms, gas stations, paint spray booths, metallurgy, mining, fire, environmental protection, etc., where need to inspect the gas concentration.