Pepperl+Fuchs has released a range of sensors of various shapes and designs, which feature a high “Safe Failure Fraction” when connected to suitable drive 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. These inductive NAMUR sensors 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 -50C to +100C with an IP68 rating.