The SI-3 industrial alarm

The SI-3 alarm can monitor up to 3 services with one condition per service. Each alarm condition has a relay providing volt-free contacts for connection to other systems. The alarm is mounted in an enclosure protected to IP65 & is fitted with an audible alarm and a Mute/Test push button. A Xenon beacon can be fitted to the alarm as an optional extra. For applications where the alarm initiating contacts are in an area where explosive gas mixtures may be present, zenner barriers can be fitted within the alarm panel, making the initiating circuits intrinsically safe. Note that, where zenner barriers are used, a connection must be made to the consumer's main earth, using a minimum of 4mm sq. cable. See BS5345 for more details.