The IS piezo alarm type ALT3 is an intrinsically safe sounder that may be used in group I hazardous areas such as underground coalmines. The alarm may be used as a pre-start alarm or as a general-purpose audible alarm.
The sounder has a wide operating voltage range from 2.0 volts to 18.36 volts and consumes a maximum of only 10mA making it ideal for use on long conveyors where voltage drop can be an issue. The ALT3 easily mounts in a 28.6mm diameter hole within the host enclosure and provides an ingress protection level of IP55.