Bacharach 19-7037, 19-7044 Operation, Power ON/OFF, Adjusting the Instrument, Backlight ON/OFF

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:

4.1Power 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 O2 level. (A minus sign may appear during power up as the sensor stabilizes.) Turn off the instrument by sliding the POWER switch to OFF.

4.2Adjusting 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%.

4.3Backlight 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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