20
5.
Allow the gas to flow at 1 litre per minute.
6.
Allow the gas to flow through the
instrument for the duration of the test,
again monitoring the rate of flow.
7.
If the final displayed value is less than
18ppm or higher than 22ppm, stop the test
and perform a calibration or send back to
Bedfont® for a free of charge calibration,
following the instructions.
A successful calibration will
be indicated by the tick
icon, press the home icon
to return to the home
screen.
