NAMUR sensors for SIL2 and SIL3 in accordance with IEC/EN 61508

For critical applications, Pepperl+Fuchs provides a range of sensors of various shapes and designs, which feature a high “Safe Failure Fraction” when connected to suitable control circuits. This enables them to be used in functional safety areas up to SIL2 or SIL3. The calculated, average failure probabilities therefore fall within the range that permits configuration of single-channel SIL 3 circuits. This is of particular interest when unfavorable installation conditions or additional assembly work in the hazardous area mean that a two-channel design is inappropriate.

These inductive NAMUR sensors have been tried-and-tested over a number of years, for example in connection with positional feedback for valve actuators or trip value signaling for manometers and actuators. Due to their intrinsic safety level of protection, these products are suitable for use in Zone 0/Zone 20, i.e. gas and dust Ex areas. For applications in extreme conditions and more demanding safety requirements (SIL3), Pepperl+Fuchs has a sensor portfolio covering a temperature range from -50°C to +100°C that, with an IP68 rating, still retains excellent sealing properties.

Pepperl + Fuchs Ltd, Tel: 0161 633 6431
Website: www.pepperl-fuchs.com

Published in Valve User Magazine Issue 15


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