E2S unveils SIL 2 certified alarm horn sounder, beacon

Dec. 11, 2015 – E2S Warning Signals has introduced a SIL 2 version of its flagship BEx range of explosion proof alarm horn sounders and Xenon strobe beacons.

The IECEx and ATEX certified BEx horns and strobes are designed and tested, promising a 99.9 per cent reliability rate. To meet the requirements of SIL 2, a combination of software and hardware in the new units  monitors and interprets the sound output of the horn or the light output from the Xenon strobe to check it is functioning correctly, explains the company. The fault monitoring reports back to the control panel utilizing either separate fault contacts or by the introduction to the monitoring circuit of a series resistor.