Analytical Industries GPR-1200 MS ATEX Portable PPB Oxygen Analyzer - Manual (Page 20)

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example, a span gas with an 80 ppm oxygen concentration with the balance nitrogen would dictate the use of
the 0-100 ppm full scale range for calibration and a 0-1 ppm measuring range. Select as described above.
3. Refer to Span Gas Preparation section above.
4. Access the MAIN MENU by pressing the MENU key.
5. Advance the reverse shade cursor to highlight AUTO SAMPLE with the ARROW keys.
6. Press the ENTER key to select the highlighted menu option.
7. The following displays appear:
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATION
>>>
00.00 PPM
AUTO SAMPLING
1 PPM RANGE
24.5 C
8. Assure there are no restrictions in the span gas line.
9. Regulate the pressure and the flow rate of the span gas to 5-30 psig and 2 SCFH flow rate, as above.
10. Place the 3-way valve in the BYPASS position.
11. Disconnect the sample gas line and install the purged span gas line.
12. Adjust the analyzer’s FLOW control valve until the FLOW INDICATOR reads 2 SCFH, as above.
13. Allow the span gas to flow for 1-2 minutes to purge the air trapped in the span gas line.
14. Place the 3-way valve in the SAMPLE position.
15. Caution: Allow the span gas to flow and wait until the reading is stable before proceeding with
calibration. The wait time will vary depending on the amount oxygen introduced to the sensor when the gas
lines were switched.
16. Access the MAIN MENU by pressing the MENU key.
17. Advance the reverse shade cursor to highlight CALIBRATION with the ARROW keys.
18. Press the ENTER key to select the highlighted menu option.
19. Note: A span gas concentration above 1000 ppm dictates the selection of the PERCENT option.
20. Advance the reverse shade cursor to highlight SPAN CALIBRATE with the ARROW keys.
21. Press the ENTER key to select the highlighted menu option.
22. Advance the reverse shade cursor to highlight desired GAS CONCENTRATION with the ARROW keys.
23. Press the ENTER key to select the highlighted menu option.
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
SPAN CALIBRATE
ZERO CALIBRATE
DEFAULT SPAN
DEFAULT ZERO
>>>
GAS CONCENTRATION
PERCENT
PPM
The following displays appear: