3
WHAT THE DIGITAL DISPLAY CAN SHOW YOU
The Digital Display is designed to indicate estimated carbon monoxide levels in a residential
environment. It is not intended for use as an industrial or commercial grade meter. The Digital Display
shows the amount of carbon monoxide (measured in parts per million) the unit is sensing. An average,
healthy adult should not feel symptoms when the unit first alarms. However, infants, the unborn, and
people with cardiac or respiratory diseases may be more sensitive to CO exposure. See “What To Do
If Your CO Alarm Alarms” for complete details on how to respond to an alarm.
Display Shows...
What It Means...
888
“888” is displayed briefly at power up, or when testing the CO Alarm.
30
(or higher)
Until the CO alarm detects at least 30 ppm of CO, it will not display a reading.
It will only display levels of carbon monoxide 30 ppm or higher.
70
(or higher)
The unit is calibrated to sound an alarm before 240 minutes have passed when
exposed to this level.
150
(or higher)
The unit is calibrated to sound an alarm before 50 minutes have passed when
exposed to this level. At this level, an average healthy adult may feel headache
within 90 minutes.
400
(or higher)
The unit is calibrated to sound an alarm before 15 minutes have passed when
exposed to this level. This level may be life threatening to a normal healthy adult
within three hours.
A number
higher than 450
Over 450 ppm of CO has been detected. Evacuate immediately!
When Checking Peak CO Level
Display Shows...
What It Means...
Highest level of CO
detected since the last
time Peak was cleared
The peak reading lets you check if there was CO detected while you were away
from home. In case of a CO alarm, it shows the emergency responder
or technician how high CO levels were before they arrived.
