CareFusion MicroCO Meter Manuel D'utilisation page 23

Control
Valve
20 ppm
carbon monoxide
in air
The plastic tubing supplied with the gas should be pushed firmly over
the reducing connector.
Slowly turn the control knob anti-clockwise until the ball in the flow
indicator is between the two marks. This will then supply a gas flow of
approximately 0.25 l/min. Apply this flow for 25 seconds and if the
Plastic Tubing
Flow
Indicator
Reducing Connector
for Calibration
21