Analytical Industries GPR-2000 ATEX Portable Oxygen Analyzer - Manual (Page 22)

Advanced Instruments Inc.
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19. Press the ENTER key to select the highlighted menu option.
GAS CONCENTRATION
PERCENT
PPM
20. The following displays appear:
000.00 PERCENT
PRESS UP OR DOWN
TO CHANGE VALUE
ENTER TO SAVE
MENU TO RETURN
>>> 080.00 PERCENT
SPAN
CALIBRATION
ENTER TO CALIBRATE
MENU TO ABORT
21. 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 alarm value.
22. Press the ARROW keys to enter the alarm value.
23. Repeat until the complete SPAN value has been entered.
24. Save the adjustment value by pressing the ENTER key or abort by pressing the MENU key.
25. 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. 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.
27. If the calibration is unsuccessful, return to the SAMPLING mode with span gas flowing through the analyzer, make sure the
reading stabilizes and repeat the calibration before concluding the equipment is defective.
28. 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.
29. Disconnect the span gas line and replace it with the purged sample gas line.
30. Wait 10-15 minutes to ensure the reading is stable and proceed to sampling.