AACULP Alarmline II Analogue LHD Control Unit - PC Programmable

Interface & Programming

The AACULP provides LED indications only and requires a PC to

configure the control unit.

Pre-Alarm and Alarm thresholds can be set through simple menu

options with no need for any graphs or nomograms. Initial set-up is

done by measuring and entering the calibration resistance of the

sensor cable removing the need to know the sensor cable length.

Volt free changeover contacts are provided inside the control unit for

Pre-Alarm and Alarm signaling to a main fire alarm control panel or

BMS system. A failsafe opto-isolated phototransistor fault output is

also provided.

No user controls are provided on the control unit. An isolated input is

provided enabling remote reset functionality.

Operation

As well as monitoring the LHD sensor cable for changes in

temperature, the control unit also monitors for open and short circuit

faults along the cable ensuring notification if the cable becomes

damaged.It is fitted with its own internal temperature monitor and

should the temperature within the controller enclosure reach 100°C

(212°F), an alarm will be signaled.

Each control unit may have up to 500m (1640ft) of LHD sensor cable

connected to it, acting as a single detection zone. When the LHD

sensor cable and the control unit are installed in different areas, a

suitable interposing cable can be used to make the electrical

connection between them.