350.135UK User Manual
The alarm will perform self-checking of the sensor every 2 minutes. Under normal conditions
no LEDs will flash. If the sensor fails, the amber fault LED will flash once every 2 minutes
together with two long beeps. Also the LCD will display the error message as below, this
indicates the alarm sensor or circuitry has failed. Please stop using the alarm immediately.
The error can be caused by either loose connections on the circuitry, short circuit or sensor
contaminated by other strong chemical fumes. Please leave the alarm in clean open air for
24hr and see if error disappears. If the error remains, please replace alarm immediately to
remain protected from carbon monoxide.
The red alarm LED will only flash when the carbon monoxide count reaches an alert level and
activates the alarm. Under normal conditions the carbon monoxide count should be below
25ppm. Therefore when the count is below 25, the LCD will only display 0ppm and the
temperature reading in a 30 second cycle.
To meet EN50291 standards, the alarm will activate within following time limits when different
critical CO level is met.
CO count (parts per million)
Alarm response time
33ppm
120 mins +
55ppm
Within 60 to 90 mins
110ppm
Within 10 to 40 mins
330ppm
Within 3 mins
When the alarm is activated the frequency of the sound will increase with the concentration,
when the concentration of the carbon monoxide reaches above 550ppm the alarm will sound
continuously with the LCD displaying “Hco” (high carbon monoxide) as below. This indicates a
dangerously high concentration of carbon monoxide present and all persons must evacuate
the building
IMMEDIATELY
.
When alarm is activated it can be temporarily silenced by pressing the TEST button, the alarm
LED will remain flashing to indicate the presence of high concentration of carbon monoxide.
ONLY silence the alarm when you are 100% sure that the source of the carbon monoxide has
been dealt with.
