Analytical Industries GPR-2900 Series Oxygen Analyzer - Manual (Page 16)

Advanced Instruments Inc.
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Note: For calibration purposes, use of the AUTO SAMPLE mode is recommended. However, the user can select the full scale
MANUAL SAMPLE RANGE for calibration as dictated by the accuracy of the analysis required – for example, a span gas with an
8.0% oxygen concentration with the balance nitrogen would dictate the use of the 0-10% full scale range for calibration and a
0-5% or 0-1% measuring ranges.
Auto Sampling:
1. Access the MAIN MENU by pressing the MENU key.
2. Advance the reverse shade cursor using the ARROW keys to highlight AUTO SAMPLE.
3. Press the ENTER key to select the highlighted menu option.
4. The display returns to the sampling mode:
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATION
CONFIG ALARMS
BYPASS ALARMS
3.3 %
AUTO SAMPLING
5 % RANGE
24.5 C
LO1 1% 10% HI2
The display will shift to the next higher range when the oxygen reading (actually the sensor’s signal output) exceeds 99.9% of
the upper limit of the current range. The display will shift to the next lower range when the oxygen reading drops to 85% of the
upper limit of the next lower range.
For example, if the analyzer is reading 1% on the 0-10% range and an upset occurs, the display will shift to the 0-25% range
when the oxygen reading exceeds 9.9%. Conversely, once the upset condition is corrected, the display will shift back to the 0-
10% range when the oxygen reading drops to 8.5%.
Manual Sampling:
1. Access the MAIN MENU by pressing the MENU key.
2. Advance the reverse shade cursor using the ARROW keys to highlight MANUAL SAMPLE.
3. Press the ENTER key to select the highlighted menu option.
4. The following display appears:
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATION
CONFIG ALARMS
BYPASS ALARMS
>>>
MANUAL RANGE
25%
10%
5%
1%
5. Advance the reverse shade cursor using the ARROW keys to highlight the desired MANUAL RANGE.
6. Press the ENTER key to select the highlighted menu option.
7. The following displays appears with the range selected and oxygen concentration of the sample gas:
MANUAL RANGE
25%
10%
5%
1%
>>>
3.3%
MANUAL SAMPLING
5 % RANGE
24.5 C
LO1 1% 10% HI2
8. The display will not shift automatically. Instead, when the oxygen reading (actually the sensor’s signal output) exceeds
110% of the upper limit of the current range an OVER RANGE warning will be displayed.