CareFusion MicroCO Operating Manual page 25

If the above message is repeated, the CO meter must be returned to
CareFusion, or an authorised agent, for sensor replacement. Sensor
life is greater than 2 years. The sensor life depends upon both the
amount of exposure to CO and other gases, particularly solvents such
as alcohol and cleaning fluids.
If the signal from the CO sensor is too high, a new calibration value
will not be stored and the following will displayed when calibration is
attempted:
The most likely cause for this is using an incorrect concentration of
calibration gas. Ensure that the concentration of calibration gas is
correct (20ppm) that the connections to the gas cylinder are secure,
and then repeat the calibration procedure.
In order to stop any gas leak from the can after calibration, ensure
that the control knob is tightened firmly.
Only certified calibration gas from a reputable source should
•
be used.
Ensure that no CO is present on the sensor for 3 minutes
•
before starting the calibration procedure.
Ensure that the instrument and gas cylinder have stabilised at
•
room temperature before calibrating.
In order to stop any gas leak from the can after calibration,
•
ensure that the control knob is tightened firmly.
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