Intrinsically Safe Devices

Sourced and supplied across Saudi Arabia

Intrinsic safety is the only protection concept that limits energy rather than containing an explosion, and that gives it a property none of the others have: the circuit is safe enough to work on live, which is why it is the normal choice for instrumentation in Zone 0 and for anything a technician must calibrate in place. The consequence is that you cannot buy an intrinsically safe device on its own. Safety belongs to the loop, so the field device, the barrier or isolator, and the cable between them are certified as a system, and the loop only holds if the barrier's output parameters stay within the device's input parameters, with the cable's own capacitance and inductance counted in. That last term is the one most often forgotten, and it is why a long run can invalidate a loop that was correct on paper. Send the device, the barrier and the cable length together, and state whether a galvanic isolator is preferred over a zener barrier.