Preventive Maintenance
80
5 Adjust the minimum range calibration
a Place the oxygen sensor into room air (21%)
b Turn O
2
OFFS potentiometer (P5, AVM 3-2) until the values on the screen show 20
c Select MIN on the touch screen.
6 Adjust the maximum range calibration.
a Place the oxygen sensor into 100% O
2
by reinstalling it into its mount.
b Apply oxygen flow for one minute. Allow O
2
cell to stabilize.
c Turn O
2
GAIN potentiometer (P6, AVM 3-2) counter clockwise until the values shows close to
or 80
d Select MAX on the touch screen.
e Remove the source of 100% O
2
and vent the O2 cell to room air (21%)
f Verify that the MIN setting has not changed more than ±2 digits.
7 Select SAVE twice on the touch screen to store the minimum and maximum values into memory.
Readjust if necessary.
8 Select QUIT to return to the main menu.
Caution: Pressing QUIT at any time during the procedure will cancel the session’s
settings and reload the previously stored calibration coefficients.
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