Shedman

This is for internal detection. The alarm controller is designed for a commercial vehicle that runs on a 24v supply. The supplied sensors are ultrasonic intended for use in the confined space of a truck cab and therefore not suitable for the wide space on a bus with draughts around the doors. The alarm box has auxiliary connections for normally open or closed contacts which the manufacturer has advised could be used with a regular internal PIR that will operate on a 24v supply (but they do not supply)