CareFusion MicroCO Operating Manual page 63

Dispose of the waste battery in accordance with EU
Waste Battery Regulations.
The MicroCO meter has an internal battery with a life of approximately
10 years. This battery supplies the sensor signal conditioning circuit
continuously to ensure instant start up.
When the battery has expired, the following warning message will be
displayed:
and the alarm will sound when the unit is first turned on.
When this occurs, the CO meter must be returned to CareFusion, or an
authorized agent, for battery replacement.
Sensor life is greater than 2 years. The sensor life depends upon both
the amount of exposure to CO and other gases and solvents such as
alcohol and cleaning fluids.
When the sensor has expired it will become impossible to obtain a
correct calibration. When this occurs, the Micro CO must be returned
to CareFusion or an authorised agent, for sensor replacement.
The Micro CO meter is designed for a product lifetime of 7 years.
61