... .2.Automatic recognition and protection the concentration of sensors , short-circuit and open-circuit of sensors, and automatic fault detection .3. Explosion ... stand current signal,(0~20mA broken circuit ,2mA sensor fault, 22mA over concentration),can be networked with DCS,PLC ... 3/4" internal thread Output mode alarm normal open;fault normal close Detection Gas Combustible gas, VOC (Certain Organic ...