1.4.2 Alarm condition
The alarm response time of the detector complies with EN 50291.
The alarm won’t stop until CO concentration is lower than 40PPM. Put
the detector in clean air, the alarm will terminate automatically in 6
minutes, or you can quit alarm condition by pressing and holding the
TEST button for 1 to 3 seconds.
IMPORTANT
: When you hear successive beeps, it means high
concentration of CO. You and all the personnel shall leave the
dangerous site at once and seek help.
1.4.3 Low CO concentration warning
In daily life, low levels of carbon monoxide can often occur. For
example, cigarette smoking, burning candle and gas-burning
appliances can produce low concentrations of CO. Although it may
do no harm to normal people, prolonged exposure to low levels of CO
can impair the health of vulnerable groups such as children, pregnant
women, elderly or patients. This warning is to help these people avoid
prolonged exposure to low levels of CO. It doesn’t mean a dangerous
situation, so please don’t be panic.
When CO concentration is greater than 30PPM for a duration of more
than 60 minutes, or when CO concentration is greater than 40PPM for
a duration of more than 40 minutes, low CO concentration warning will
be made. The low CO concentration warning which has been specified
in Section 1.3.1 is distinctly different from alarm warning:
Difference
Low CO concentration warning
Alarm warning
1
The Alarm indicator flashes 4
times with beeps at a slower
speed.
The Alarm indicator flashes 5
times with beeps at a faster
speed.
2
Low CO concentration warn-
ing is given once every 3 to 5
minutes.
Alarm warning is given 3 times
every 10 seconds.
Low CO concentration warning won’t stop until CO concentration is
less than 25 PPM.
IMPORTANT
: If you hear 4 slower beeps every 3 to 5 minutes instead
of continuous alarm sounds, it’s low CO concentration warning. Don’t