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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
level. (A minus sign may appear during power up as the
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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.
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