Analytical Industries GPR-1200 ATEX Portable Trace PPM Oxygen Analyzer - Manual (Page 24)

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8. Remember steps #29-30 and #32-33 do not apply because for air calibration the SAMPLE/BYPASS valve should already be
in the SAMPLE position.
9. Perform step #31.
10. Skip to step #34 and perform the remainder of the procedure.
Output Span
Accuracy due to manufacturer tolerances may result in a slight difference between the LCD display and the 0-1V analog output.
However, the difference is less than 0.25% of range and falls well below the specified accuracy of the analyzer. In rare
instances the 0-1V signal output may not agree to the reading displayed by the LCD. This feature enables the user to adjust the
1V signal output should the LCD display not agree. Note: Adjust the 0V signal output with the OUTPUT ZERO option described
above.
Procedure:
1. Access the MAIN MENU by pressing the MENU key.
2. Advance the reverse shade cursor using the ARROW keys to highlight CALIBRATION.
3. Press the ENTER key to select the highlighted menu option and the following displays appear:
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATION
>>>
CALIBRATION
SPAN CALIBRATE
ZERO CALIBRATE
DEFAULT SPAN
DEFAULT ZERO
OUTPUT SPAN
OUTPUT ZERO
4. Advance the reverse shade cursor using the ARROW keys to highlight DEFAULT SPAN.
5. Press the ENTER key to select the highlighted menu option.
6. The following display appears
100.0
OUTPUT SPAN OFFSET
PRESS UP OR DOWN
TO CHANGE VALUE
ENTER TO SAVE
MENU TO RETURN
7. Compute the adjustment value as described in Appendix B or consult the factory. The true adjustment value must be
determined empirically by trial and error. Adjust the initial adjustment value for additional percent errors.
099.0
OUTPUT SPAN OFFSET
PRESS UP OR DOWN
TO CHANGE VALUE
ENTER TO SAVE
MENU TO RETURN
8. Press the ENTER key to advance the underline cursor right or press the MENU key to advance the underline cursor left to
reach to the desired digit of the OUTPUT SPAN OFFSET value.