Ei Electronics Ei207/208 Series Instructions Manual page 7

Table B: CO Alarm Response
CO Gas Level
0 < ppm < 10 ppm
10 < ppm < 30 ppm
30 < ppm < 43 ppm
43 < ppm < 80 ppm
80 < ppm < 150 ppm
> 150 ppm
* unless it has alarmed previously (see CO Alarm Memory below)
ppm values shown in table are for example purposes only
Red Light Display Icon
(Pre Alarm) (before horn sounds)
Off*
PPM level (flash)
Off*
on - 4 seconds,
off - 12 seconds
Off*
1 flash
every 2 secs
2 flashes
every 2 secs
4 flashes
every 2 secs
Display Icon
(after horn sounds)
Blank
PPM level (flash)
on - 4 seconds,
off - 12 seconds
PPM level
Sounder
Blank
PPM level
on within 60-90 mins
(typ 72 mins)
on within 10-40 mins
(typ 18 mins)
on within 2 mins
(typ 40 secs)
(Alarm)
Off
Off
Off
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