Pepperl+Fuchs intrinsically safe transmitter power supplies

Pepperl+Fuchs has released four transmitter power supplies for intrinsically safe applications up to SIL3. The transmitter power supplies for the K- and H-Systems have each been extended to include two additional modules that are designed for intrinsically safe applications up to SIL 3 according to EN61508. The advantage of these supplies is that only a single transmitter is required to construct an intrinsically safe signal circuit for SIL 3. Previously for SIL 3 this was only possible using two separate inputs, both of which had to be monitored for redundancy reasons. Internal diagnostic functions are also signalled via a single output and red LED, and prescribed test intervals can be extended for SIL 2 applications.

The single-channel KCD2-STC-Ex.1ES and KFD2-STC4-Ex1.ES transmitter power supplies are 12.5 and 20 mm in width respectively and offer an active and passive 4-20 mA output signal as well as 1-5 V for the control level. They also supplement the K- System, which incorporates approximately 150 different intrinsically safe isolator modules and signal conditioners. Assembled to the DIN mounting rail (35 mm) with power rail, the devices are able to provide internal diagnostics using a single failure signal.

The HiC2025ES and HiD2025ES transmitter power supplies were developed for the H-System, where the modules are mounted on prewired termination boards. The space-saving modules are 12.5 and 18 mm wide respectively and are both compatible with existing termination boards in the system.