The Safest Way To Calibrate: An Introduction To Intrinsically Safe Calibrators
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•White Paper: The Safest Way To Calibrate: An Introduction To Intrinsically Safe Calibrators
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 are:
- 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.
An intrinsically safe calibrator is therefore designed to be incapable of causing ignition in the surrounding environment with flammable materials, such as gases, mists, vapors or combustible dust. Intrinsically safe calibrators are also often referred to being “Ex calibrators”, “calibrators for Ex Areas”, or “IS calibrators”. An Ex Area also refers to an explosive environment and an Ex calibrator is a device designed for use in the type of environment in question.
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•White Paper: The Safest Way To Calibrate: An Introduction To Intrinsically Safe Calibrators