This isolated barrier is used for intrinsic safety applications. It transfers digital signals (NAMUR sensors/mechanical contacts) from a hazardous area to a safe area. The proximity sensor or switch controls a form C changeover relay contact for the safe area load. The normal output state can be reversed using switches S1 and S2. Switch S3 is used to enable or disable line fault detection of the field circuit. During an error condition, the relays revert to their de-energized state and the LEDs indicate the fault according to NAMUR NE44.
2-channel isolated barrier
230 V AC supply
Dry contact or NAMUR inputs
Relay contact output
Line fault detection (LFD)
Reversible mode of operation
Up to SIL 2 acc. to IEC 61508/IEC 61511
Housing width: 20 mm
Safety Integrity Level (SIL): SIL 2
Rated voltage: 207~253 V AC, 45~65 Hz
Field device: NAMUR sensor
Type: 2 x relay (change-over contact)
Reversible mode of operation
Industrial automation
