350.137UK User Manual
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.
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.
The alarm is designed to record maximum readings and average readings over the last 24-hour period.
This allows you to keep track of the presence of carbon monoxide without needing to be present in the
room. To bring up the reading, simply press and hold TEST button until “Ph=” is displayed on the front
screen.
It will move to the next page to show the peak reading for the past 24 hours automatically after a short
wait, or you can manually press the TEST button to enter the next page if you do not wish to wait. The
following page will display “24H” to indicate it will display the average reading next. Press the button
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