Explosion-proof alarm horn sounders and strobe beacons from E2S Warning Signals are SIL 2-certified and are designed for fire- and gas-detection systems. A combination of software and hardware monitors and interprets the sound output of the horn or the light output from the Xenon strobe to check that it is functioning properly. The fault monitoring reports back to the control panel, utilizing either separate fault contacts or the introduction to the monitoring circuit of a series resistor. Using the series resistor facility eliminates the need for any additional cables and can be used in a standard two-wire arrangement. 281/377-4401; www.e2swarningsignals.com.

Related Stories