What is intrinsically safe calibration?
By definition, intrinsic safety (IS) is a protection technique
for safely operating electronic equipment in explosive
environments. The concept has been developed for safely
operating process control instrumentation in hazardous
areas. The idea behind intrinsic safety is to make sure that
the available electrical and thermal energy in a system
is always low enough that ignition of the hazardous
atmosphere cannot occur. A hazardous atmosphere is an
area that contains elements that may cause an explosion:
source of ignition, a flammable substance and oxygen.
Hazardous area classifications in IEC/European countries
- Zone 0: an explosive gas & air mixture is continuously present or present for a long time.
- Zone 1: an explosive gas & air mixture is likely to occur in normal operation.
- Zone 2: an explosive gas & air mixture is not likely to occur in normal operation, and if it occurs it will exist only for a short time.