Teledyne SnackO2 - Food package analyzer - Manual (Page 12)

Teledyne Analytical Instruments
12
depletes over time, the number of displayed chevrons will decrease. It is
recommended that the sensor is replaced when two or fewer chevrons are
displayed.
Calibration
Oxygen Sensor (O
2
)
Electrochemical sensors degrade slowly over time. For optimal performance and to
ensure accuracy, it is recommended that the oxygen sensor be span calibrated daily
using normal outside atmosphere air (20.9% O
2
). Use the following steps to
calibrate the oxygen sensor.
1. Turn on the analyzer and allow it to warm up for at least one (1) minute. Ensure
the Sleep Mode Timeout is set greater than one minute.
2. Press the SAMPLE button to turn on the sample pump. Allow the pump to draw
in outside atmosphere air (20.9% O
2
) for thirty (30) seconds or until the oxygen
reading has stabilized.
3. If oxygen reading is greater than +/- 0.3% of the sampled air, then CAL adjust is
recommended. Press the MENU button to enter the Program Mode. The LCD
will display: O
2
CAL?.
4. Press the YES/NO button. The LCD will display: O
2
XX.XX. Press the arrow
buttons to adjust the O2 value to read 20.90.
5. Press the SAVE button to save the calibration value and to exit the Program
Mode.
Maintenance and Adjustments
Opening / Closing The Analyzer Case
From time to time it will be necessary to open the analyzer case to perform
maintenance and/or replace the oxygen sensor. The following procedure is a step
by step guide to opening the analyzer. Read through the entire procedure before
attempting to open the analyzer case.
Keep in mind that the top half of the case is connected to the bottom half by a non-
detachable ribbon cable. Great care should be taken when handling the opened
analyzer.
1. To open the analyzer, place the Power switch to the OFF position and place the
analyzer face-down on a padded, flat surface.
2. Using a phillips screwdriver, completely remove the six (6) screws from the back
of the analyzer.