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4
4 OPERATION
To operate the Oxor II, you simply . . .
• Set its POWER switch to ON,
• Wait for the instrument to warm up (approx. 1 minute),
• Span the display (if necessary),
• Take a gas sample.
Detailed operating procedures are presented below:
4.1 Power ON/OFF
Turn on the instrument by sliding its POWER
switch to ON. Observe that when power is first
applied, all numerical LCD segments and the deci-
mal point are tested for 5-15 seconds; after which, the LCD shows the
detected O
2
level. (A minus sign may appear during power up as the
sensor stabilizes.) Turn off the instrument by sliding the POWER
switch to OFF.
4.2 Adjusting the Instrument
After being turned on and warmed up for at least 1 minute, the
instrument should indicate 20.9% in fresh air. If the instrument needs
to be zadjusted, proceed as follows:
1. Ensure that the instrument is sampling fresh air that is free of any
oxygen displacing gases.
2. Using a 1/8" flat-blade screwdriver, turn the
ADJUST potentiometer until the LCD shows
20.9%. An instrument can be considered prop-
erly adjusted with a display bounce of up to ±0.2%.
4.3 Backlight ON/OFF
The LCD can be read in low-light areas by setting the front panel
LIGHT switch to ON. The backlight stays on until turned off, or until
the POWER switch is set to OFF.