Analytical Industries GPR-1200 ATEX Portable Trace PPM Oxygen Analyzer - Manual (Page 16)

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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 to highlight MANUAL SAMPLE.
3. Press the ENTER key to select the highlighted menu option and the following displays appear:
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATION
>>>
MANUAL RANGE
25%
1%
1000 PPM
100 PPM
10 PPM
4. Advance the reverse shade cursor to highlight the desired RANGE.
5. Press the ENTER key to select the highlighted menu option.
6. The following display(s) appear depending on the range selected and oxygen concentration of the sample gas:
3.3
PPM
MANUAL SAMPLING
10 PPM RANGE
24.5 C
OR
00.00 PPM
OVERRANGE
AUTO SAMPLING
10 PPM RANGE
24.5 C
7. 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.
8. Once the OVER RANGE warning appears the user must advance the analyzer to the next higher range via the menu and
keypad Press MENU, select MANUAL SAMPLING, press ENTER, select the appropriate MANUAL RANGE and press ENTER
again.
Start-Up is complete . . .