Vyaire MicroCO Manual De Funcionamiento página 58

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.
CAUTION: opening the control knob more than indicated will
give erroneous reading and could damage the cell.
The unit will then beep 3 times, store the new calibration value, and
display the following:
The gas supply should then be turned off.
If the signal from the CO sensor is too low a new calibration value will
not be stored and the display will show:
The most likely cause for this is an expired cell but may also be caused
by depressing the calibration switch with no gas applied. Ensure that
the concentration of calibration gas is correct (20ppm), that the
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