When the voltage is less than 3.6V, low battery warning will be given
at least once every minute.
The LCD display shows condition D as specified in 1.3.1.4.
1.3.1.12 Fault warning
If there is fault in the sensor or circuit, fault warning will be given within
3 minutes. Fault warning will be made at least once every minute until
the fault is eliminated.
The LCD display shows “Err” when fault warning is given.
1.3.1.13 End-of-life warning
When the detector has been working for about 10 years, end-of-life
warning will be given. The product cannot be used any more.
The LCD display shows “End” when end-of-unit-life warning is given
1.3.1.14 Alarm warning
The alarm response time of this detector complies with EN 50291. In
alarm condition, at least three cycles of alarm will be made, and the
interval between each cycle will be less than 10 seconds. The alarm
will terminate automatically in 6 minutes when CO disappears.
1.3.1.15 Alarm silence
When the detector is in alarm condition and the CO concentration
is less than 200 PPM, press and hold the TEST button and it will
enter alarm silence condition. Alarm silence condition is the same
as alarm condition except the buzzer doesn’t beep temporarily. The
Alarm indicator still flashes. Alarm silence condition lasts less than 10
minutes. Press the TEST button in alarm silence condition, and it will
recover alarm condition immediately.
1.3.1.16 Low CO concentration warning
When CO concentration is greater than 30PPM for a duration of more
than 60 minutes, or when CO concentration is greater than 40PPM for
