» BMS Interface Overtemperature Alarm:  OTMA 1 

The OTMA single zone Overtemperature Alarm has been designed for applications where Battery Backup is required in important areas such as computer rooms, comms rooms, server rooms, plant rooms etc., where it is important for the system to remain operative in the event of power failure.

OTMA system comprises of the control unit connected by a leader cable to the temperature sensor. The temperature sensor is rated for temperature band 0 to 30°C. The Control unit can be inside or remote to the monitored area and is linked to the temperature sensor by a two core leader cable. 

The temperature sensor is normally of the ‘tamper-resistant’ type and provides an internal adjustment for the setting of the desired trip temperature. Alternatively an optional digital temperature readout sensor can be provided which indicates the temperature at the location of the sensor. 

When the room reaches the overtemperature level, the light on the OTMA Controller activates, and remains on while the sensor continues to be in alarm. The horn on the OTMA also sounds and can be muted by pressing the mute button, and the horn then automatically resets. The control system and alarm light also automatically reset when the temperature returns to normal.

The Controller is provided with a 'no-volt' output signalling relay (rated 230VAC 2 amp) providing change-over contacts which can link to the Aqualeak AutoDial Unit. The OTMA can also be provided with optional Power and Continuity Fail output Relays. 

The system can alternatively be configured as the OHMA to provide overhumidity monitoring from a humidity sensor.