Pepperl+Fuchs' KFU8-SR-EX universal powered switch amplifier can be used in intrinsically safe applications and functional safety up to SIL 2. The KFU8 can be supplied with 19 V DC to 30 V DC or 90 V AC to 253 V AC. With this functionality, a single device can be used with various supply voltages. As a result, fewer components need to be kept in stock and in the field technician’s toolbox.
The switch amplifiers transmit discrete signals from NAMUR sensors or mechanical contacts in the hazardous area to the safe area. A proximity sensor or switch controls the load on the control side via a changeover relay contact. The direction of effect can be reversed. All modules feature line fault detection. In the event of a fault, the relays de-energize and the fault is indicated by LEDs in accordance with NAMUR NE44. The devices are designed for use in environments from -40 °C to +60 °C and have all major international approvals such as ATEX, IECEx, and UL. In addition, the products are certified by TÜV Rheinland for applications up to SIL 2 Edition 2 according to IEC 61508 / IEC 61511.
The devices are available as one- and two-channel versions; the one-channel version is available with an optional additional fault relay contact output.
