Analytical Industries GPR-3500 MO Portable Oxygen Analyzer - Manual (Page 20)

Advanced Instruments Inc.
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Caution: To assure an accurate calibration, the temperature and pressure of the span gas must closely approximate the sample
conditions. The GPR-3500MO has a single 0-100% range and should be calibrate as described above.
1. Access the MAIN MENU by pressing the MENU key.
2. Advance the reverse shade cursor using the ARROW keys to highlight CALIBRATE.
3. Press the ENTER key to select the highlighted menu option.
4. Advance the reverse shade cursor using the ARROW keys to highlight DEFAULT SPAN, to remove all previous adjustments.
5. Press the ENTER key to select the highlighted menu option.
6. Repeat to select SPAN CALIBRATE.
7. The following displays appear:
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATE
24.5 C 100 KPA
>>>
CALIBRATION
SPAN CALIBRATE
ZERO CALIBRATE
DEFAULT SPAN
DEFAULT ZERO
OUTPUT SPAN
OUTPUT ZERO
8. Assure there are no restrictions in vent line.
9. Regulate the pressure and control the flow rate as described above at 5-30 psig and a 2 SCFH flow rate.
10. Allow the span gas to flow for 2-3 minutes to purge the air trapped in the span gas line.
11. Disconnect the sample gas line and install the purged span gas line.
12. Caution: Keep the span gas flowing and wait until the reading is stable before proceeding with calibration.
13. Press the ENTER key to select the SPAN CALIBRATE option.
14. Note: A span gas concentration above 1000 ppm dictates the selection of the PERCENT option.
15. Advance the reverse shade cursor using the ARROW keys to highlight the desired GAS CONCENTRATION.
16. Press the ENTER key to select the highlighted menu option.
GAS CONCENTRATION
PERCENT
PPM
17. The user must ascertain that the oxygen reading (actually the sensor’s signal output) has reached a stable value within the limits
entered below before entering the span adjustment. Failure to do so will result in an error.
18. The following display appears:
000.00 %
PRESS UP OR DOWN
TO CHANGE VALUE
SELECT TO SAVE
ESC TO RETURN
18. Press the UP/ DOWN ARROWS to enter the first digit of the span value.
19. Press the ENTER key to advance the underline cursor right to the second digit of the span value.
20. Press the MENU key to advance the underline cursor left to the previous digit.
21. Press the UP/ DOWN ARROWS to enter the second digit of the span value.
22. Repeat until the complete span value has been entered.