Analytical Industries GPR-1100 ATEX Portable Trace PPM Oxygen Analyzer - Manual (Page 16)

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Main Menu:
Access the MAIN MENU by pressing the MENU key:
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
SPAN CALIBRATE
ZERO CALIBRATE
DEFAULT SPAN
DEFAULT ZERO
Range Selection:
The GPR-1100 analyzer is equipped with five (5) standard measuring ranges (see specification) and provides users
with a choice of sampling modes. By accessing the MAIN MENU, users may select either the AUTO SAMPLING
(ranging) or MANUAL SAMPLING (to lock on a single range) mode.
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 80 ppm oxygen concentration with the balance nitrogen would dictate the use of the
0-100 ppm full scale range for calibration and a 0-10 ppm measuring range.
Procedure - Auto Sampling:
1. Access the MAIN MENU by pressing the MENU key.
2. Advance the reverse shade cursor 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
SPAN CALIBRATE
ZERO CALIBRATE
DEFAULT SPAN
DEFAULT ZERO
>>> 00.00 PPM
AUTO SAMPLING
10 PPM RANGE
24.5 C
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.