Operating and Alarm Characteristics
LED Display Shows
Alarm Sound
Unit Status
Recommendation
"---" then "888"
4 quick beeps,
5 seconds
silence,
repeated once
Self checking (Test
button was pressed)
None – CO has not
been detected.
Steady “0” displayed.
None
Normal AC operation
(sensing no CO) and
with a good battery.
None
An alternating display
of "CO" and the CO
concentration from
30-999.
4 quick beeps,
5 seconds
silence,
repeating
Alarm condition.
Dangerous
concentrations of CO
detected
Refer to “What to do
When the Alarm
Sounds” (inside front
cover)
Display alternates
between 'Lb" and
current CO level, (0-
999).
One quick
beep every
60 seconds
AC powered and
in Low Battery
condition
Replace alarm.
Steady “Err “displayed One quick
beep every 30
seconds
Unit malfunction
If "Err" continues, unit
has malfunctioned and
must be replaced
immediately.
Unit will not respond to
CO. Press the Peak Level
button while unit is in
"Err"mode to obtain error
code and call Product
Support line.
No display. Green LED
flashes briefly once
every 60 seconds.
None
Battery backup
operation. Unit
monitoring for CO.
Verify AC power is
restored as soon as
possible to conserve
battery.
6. Operating Characteristics
If the alarm senses dangerous levels of CO, the digital display will alternate between
"CO" and the measured CO concentration in parts per million (PPM), and the alarm
will emit an audible alarm pattern. This alarm will display a “0” if CO concentrations
between 0 and 30 PPM have been detected within the last 15 seconds.
When the unit is first powered up, the digital display will show three “eights” –
indicating the alarm is in the start-up mode. The three “eights” will remain for
approximately 5 seconds. After 5 seconds, the alarm should display “0” and begin
monitoring the air for CO and will continue to do so as long as it receives power.
The digital display will be brightly lit if the unit is in alarm, or in high light, and
then will become dim in the standby condition during low light conditions.
The following table illustrates the possible digital displays, describes the
audible alarm patterns, and the recommended actions to take.
"End" displayed.
Red LED flashes
two times every 30
seconds
2 quick beeps
every 30
seconds.
End of unit life
Replace unit immediately.
Refer to Section 2 for End
of Life Warning. See
Discharge section on next
page.
T
An alternating
display of
"PCO" and the CO
concentration (PPM)
None
Unit has detected
100ppm or more CO
Push test/reset button,
check appliances
2547-7201-01_EN.qxp__ 15-6-1 上午11:56 页 13
