In stand alone mode, the detector has 3 relay outputs, and a monitored 24V output (Intended for alarm sirens). The 3 relay outputs correspond to the 3 alarm levels of PREALARM, ALARM 1 and ALARM 2. Each of these threshold levels has a default setting, and can be altered by +/- 5% or +/- 10%.
The detector will display the gas type, the current status (normal, fault or alarm), along with the current sensor reading on its 2 x 16 character LCD display. As the gas concentration level rises, the detector will light its relevant alarm LEDs and operate its relays. They operate concurrently, so that in the highest alarm level, all lower alarm LEDs & relays will remain ON.
In System mode, the detector will display SYS to indicate that it is now part of a system. It will function similar to when it is in Stand alone mode, except the alarm relays will be under the control of the fire panel. This feature allows the control panel to monitor the system as a whole before deciding whether or not to operate an output.
The detectors can also be locally recalibrated, with menu options to set the zero level, and options to set the calibration span, with the use of a calibration gas cylinder filled with the full scale gas concentration level.
At the end of the recommended working life of the sensor, a replacement sensor should be fitted. The part numbers for each sensor are shown on the specification table.