Analytical Industries GPR-2000 ATEX Portable Oxygen Analyzer - Manual (Page 15)

Advanced Instruments Inc.
15
Main Menu
Access the MAIN MENU by pressing the MENU key:
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATION
Range Selection
The analyzer is equipped with four (4) 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 and air as the gas standard 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
3.3 %
AUTO SAMPLING
5 % 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.
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 and the following display appears: