The primary task of Ex modules is to isolate the intrinsically-safe circuits in the hazardous area from the non-intrinsically-safe circuits of the programmable controller.

The intrinsically-safe type of protection offers the following advantages:

• Problem-free replacement of intrinsically-safe equipment during operation.
• Easy measuring and calibration of the measuring distance even during operation.
• Live-line working at intrinsically-safe circuits is possible without plant downtimes.
• No complex enclosure designs (such as flameproof enclosures).
• Intrinsically-safe equipment from different manufacturers can be interconnected.
• Proven type of protection in the chemical industry.