Operation And Calibration; Power-On Delay; Test Switch Function; Acknowledge Function - AMC 1ACO Instructions Manual

Gas Monitor 1ACO One-Channel Monitor

5 OPERATION AND CALIBRATION

This section covers the operation and calibration procedures pertaining to the Gas Monitor
1ACO.

5.1 POWER-ON DELAY

Following successful completion of all self-tests, detection of sensor WARNING, ALARM and
FAULT conditions is disabled for 30 seconds. This delay is provided to allow the sensors to
stabilize. During this delay, the status LEDs show the "sensor normal" condition (only the green
LED on). The audio alarm is silent, and the alarm relay outputs are held in the non-alarm
condition.

5.2 TEST SWITCH FUNCTION

While pressed, the on-board test switch will cause continuous activation of the alarm relay
outputs (energized or de-energized, depending on configuration), continuous activation of the
audio alarm, and all status LEDs will be illuminated. Sensor processing and updating of internal
status and timers continues. When released, the outputs and LEDs return to normal operation.

5.3 ACKNOWLEDGE FUNCTION

An option exists for an Acknowledge pushbutton switch. When pressed, any present
WARNING, ALARM or FAULT condition, including those previously acknowledged, will be
silenced (audio alarm off) for 30 minutes. If any WARNING, ALARM or FAULT condition
remains after 30 minutes, the audio alarm will again be activated. Any WARNING, ALARM or
FAULT condition returning to normal and then reactivating, or any new WARNING, ALARM or
FAULT condition will cause an immediate audio alarm.
If the Activate Alarms Until Acknowledge (latching relays) (SW1-1 ON) feature is enabled, the
alarm outputs will not automatically return to normal, but will remain in alarm until the
acknowledge button has been pressed. While a relay remains latched, the audio alarm remains
active.

5.4 ALARM/WARNING RELAY ACTIVATION DELAYS

The Gas Monitor 1ACO comes standard with 5 min activation time delays for the WARNING
and ALARM relay contacts. The activation time delays can help prevent short cycling
WARNING/ALARM in some applications. The delays can be enabled by turning ON switches
SW2-5 and SW2-6, for WARNING/ALARM respectively.

5.5 RELAY OUTPUTS

A WARNING condition on either sensor will result in activation of the WARNING relay output.
An ALARM condition on either sensor will result in activation of both the WARNING and ALARM
relay outputs.
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