100
200
400
800
Slight headache, nausea, fatigue (flu-like symptoms).
Dizziness and headache within two or three hours.
Nausea, frontal headache, drowsiness, confusion, and rapid
heart rate. Risk to life after over three hours of exposure.
Parts per million (ppm)
Effects on adults
Severe headaches, convulsions, vital organ failures. Death
possible within two or three hours.
21
20
70 ppm for 60–240 minutes
150 ppm for 10–60 minutes
400 ppm for 4–15 minutes
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The alarm may not wake up everyone in the house. If children or other people do not quickly wake up, or
if you have infants or family members with limited mobility, make sure they are assisted during an
emergency.
This alarm will not detect CO that does not reach the sensor. Doors or other obstructions may prevent CO
from reaching the alarm, so make sure there is at least one alarm installed in sleeping areas, where the
door is often closed at night.
CO alarms may not sense CO on another level of the house. For example, a CO alarm on the second level
may not sense CO in the basement. Therefore, placing CO alarms on each level of the house is
recommended.
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CO alarms may not always be heard. The alarm noise level is over 85 dB at a distance of 10 feet (3 m).
However, if the CO alarm is installed outside the bedroom, it may not wake up a sound sleeper or
someone who has recently used drugs or has been drinking alcohol. This is especially true if the door is
closed or only partially open. Even people that are already awake may not hear the alarm if the sound is
drowned out by distance or closed doors. Noise from traffic, stereos, radios, televisions, air conditioners,
or other appliances can also prevent people from hearing the alarm. This CO alarm is not intended for
people who are hearing impaired.
CO alarms are not a substitute for life insurance. Though these CO alarms warn you of increasing CO
levels, we do not warrant or imply in any way that they will protect anyone from CO poisoning.
Homeowners and renters must still insure their lives.
CO alarms have a limited life. Although the CO alarm and all of its parts have passed stringent testing and
are designed to be as reliable as possible, any of these parts could fail at any time. Therefore, it is strongly
recommended that you test your CO alarm weekly.
CO alarms are not foolproof. Like all other electronic devices, CO alarms have limitations. They can only
detect CO that reaches the sensor. They may not give an early warning of rising CO levels if the CO is
coming from a remote part of the house or is far away from the CO alarm.
Turn off power to the area where you want to install this unit at the circuit breaker or fuse box before
installation. Failure to turn off power before installation may result in serious electrical shock, injury, or
death.
Do not restore power until all alarms are completely installed. Doing so may result in serious electrical
shock, injury, or death.
Turn off power to the area where the alarm is installed before removing it from the mounting bracket.
Failure to turn off power first may result in serious electrical shock, injury, or death.
If any unit in the series does not alarm, turn off power and re-check all connections. After that, if it does
not alarm yet, replace it immediately.
Attempting to disconnect the power connector from the unit while the power is on may result in
electrical shock, serious injury, or death.
Failure to meet any of the above requirements could damage the units and cause them to malfunction.
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The alarm cannot be operated from power derived from a square wave, modified square wave, or
modified sine wave inverter. These types of inverters are sometimes used to supply power to structures in
off-grid installations, such as solar or wind-derived power sources. These power sources produce high
peak voltages that can damage the alarm.
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This alarm will sound an alarm when the following CO concentrations are detected within the time
periods listed:
The table below shows the effects that different levels of CO can have on the body:
When the CO concentration reaches the alarm level, this alarm will emit four short beeps, and the LED
indicator will flash red every 5.8 seconds.
CO Alarm
CO Alarm Level
CO Concentration and Symptoms
Limitations of CO Alarms
Electrical Shock Hazard