NEVER IGNORE THE ALARM.
Pre-Alarm: When the Alarm detects over 43 ppm CO the red light flashes every 2
seconds. This helps locate CO leaks as the unit gives an indication straight away.
(Without this feature the CO level would need to be at 43 ppm CO for typically
72 minutes for an alarm sound to be given). Note the Pre-Alarm signal may be
triggered by CO coming for example, from cooking with gas, from car engines or
from nearby barbecues. This is usually not a concern, unless the Pre-Alarm signal
persists until the alarm sounds and the CO source is unknown.
The Display Models will display the level of CO gas above 30 ppm. This is also
an early warning indication that the CO gas level is building up and should be
investigated. Above 43 ppm CO, the red light will also flash.
NOTE: The CO Alarm may sound if cigarette smoke is blown into it, or aerosols
are released nearby.
CO ALARM MEMORY
The CO Alarm memory is an important feature of the CO Alarm where even if the
house is unoccupied during an alarm condition it warns the homeowner that the unit
has previously detected CO gas and been in alarm. The memory is displayed via
the flash rate of the red light. The red light will flash for a 24 hour period after an
alarm event has stopped. After this period, the memory can be viewed by pressing
and holding the test button (the flash rate will be as per Table B).
The memory flash rate: The RED light will flash at different rates every 50 seconds
depending on the level of CO detected as follows:
- Red light flashes twice every 50 seconds, meaning that a CO level above
43 ppm has been detected and that the unit was previously in alarm.
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