Application : *Designed for explosive atmospheres Zone 1 and Zone 2; *Designed for combustible dust Zone 21 and Zone 22; *Designed for IIA, IIB and IIC groups explosive atmospheres; *Designed for temperature classifications T1~T6; *Design for explosive hazardous locations such as oil refinery, storage, chemical, *pharmaceuticals,military industries etc. *Used for position signed feedback in the electric control system.