CareFusion MicroCO Meter Manuel D'utilisation page 57

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 counter-clockwise until the ball in the flow
indicator is on the first mark.. This will supply the proper amount of
flow to the cell.. Apply this flow for 25 seconds and if the meter does
not read 20ppm use the calibration tool to push the calibration switch.
Plastic Tubing
Flow
Indicator
Reducing Connector
for Calibration
55