It is used to adjust and isolate all kinds of signals of field instruments, and convert them into standard signals acceptable to computers, DCS, PLC, etc., or special signals specified by users. A device, such as a relay, used to electrically separate a remote device from an operating device.

Intrinsically safe explosion-proof instrument associated equipment, under normal circumstances does not affect the function of the measurement system. It is set on the side of the safe place, when the intrinsic safety explosion-proof system fails, it can limit the energy (electric energy) into the dangerous place within the safe value, so as to ensure the safety of on-site production.

It can be seen from the above that the essential difference between the isolator and the isolated safety gate is whether it is explosion-proof, that is, the difference in the safety factor.