Intrinsically Safe Fire Detection and Alarm Devices

It means the device is designed so the electrical and thermal energy available in it, in normal use and under fault conditions, stays too low to ignite a flammable atmosphere. In practice the field devices are only half of it: the circuit feeding them has to be energy-limited too, which is what the Zener barriers in this range are for. Specify the barrier and the device together.

Yes — the IS devices are fed through a barrier that limits the energy passing from the safe area into the hazardous area. This range carries two Z-System barriers: 764744 for intrinsically safe detectors, and 764746 for an AV device, which drives one sounder or two strobes. Check the barrier count against your device count early, because it changes the panel-end wiring.

Detector base 805590. The 803271.EX rate-of-rise heat detector, the 803371.EX optical smoke detector and the 803374.EX dual angle optical/heat detector are all listed for use with that base, so order bases alongside the heads rather than assuming existing bases will take them.

No, and it is worth knowing before you specify. The IS28 MK6 sounder (SOUNDER-EX) is ATEX approved but carries no EN 54-3 approval, and the visual indicating device (VID-EX) is ATEX approved with no EN 54-23 approval. Both are monitored. If your specification requires EN 54 approved sounders or beacons throughout, raise it with us before ordering.