Analytical Industries GPR-3500 MO Portable Oxygen Analyzer - Manual (Page 21)

Advanced Instruments Inc.
21
100.00 %
SPAN
CALIBRATION
ENTER TO CALIBRATE
MENU TO ABORT
23. Press ENTER to initiate the span calibration procedure
24. Allow approximately 60 seconds for the calibration process while the processor determines whether the signal output or reading
has stabilized within 60% of the full scale low range.
25. Both the ZERO CALIBRATE and SPAN CALIBRATE functions result in the following displays:
PASSED
CALIBRATION
OR
FAILED
CALIBRATION
26. If the calibration is successful, the analyzer returns to the SAMPLING mode after 30 seconds.
93.3
%
AUTO SAMPLING
100% RANGE
24.5 C 100 KPA
18. If the calibration is unsuccessful, return to the SAMPLING mode with span gas flowing through the portable oxygen purity
analyzer, make sure the reading stabilizes and repeat the SPAN CALIBRATE procedure before concluding the equipment is
defective.
19. Before disconnecting the span gas line and connecting the sample gas line, restart if necessary the flow of sample gas and allow it
to flow for 1-2 minutes to purge the air inside the line.
20. Disconnect the span gas line and replace it with the purged sample gas line.
21. Wait 10-15 minutes to ensure the reading is stable and proceed to sampling.
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.
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.
4. The following displays appear: