Analytical Industries GPR-7500 AIS Trace PPM Hydrogen Sulfide Analyzer - Manual (Page 20)

Advanced Instruments, Inc.
20
This screen shows various options available. You can use the UP and DOWN arrow key to move the cursor
and highlight the desired function. After moving the cursor to the desired function, press ENTER to access
that function.
Range Selection
The GPR-7500 AIS transmitter is equipped with three (3) 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
also select the MANUAL SAMPLE mode for calibration but the span gas must not exceed the full scale of
the manual range selected
– for example, a span gas with15 PPM H2S concentration in nitrogen would
dictate the use of the 0-20 PPM full scale range for calibration.
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.
The display returns to the sampling mode:
4. The display will shift to the next higher range when the H2S reading exceeds 99.9% of the upper limit of
the current range. The display will shift to the next lower range when the H2S reading drops to 85% of
the next lower range. For example, if the transmitter is reading 2 PPM on the 0-20 PPM range and an
upset occurs, the display will shift to the 0-50 PPM range when the H2S reading exceeds 19.99 PPM.
Conversely, once the upset condition is corrected, the display will shift back to the 0-20 PPM range
when the H2S reading drops to 17 PPM (85% of 20 PPM).
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.
The following display appears:
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATION
CONFIG ALARMS
ALARM BYPASS
BYPASS ALARMS
12 PPM
Auto Sampling
0-500 PPM Range
76 F 97 Kpa
LO1 0 PPM HI 40 PPM
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATION
CONFIG ALARMS
BYPASS ALARMS
MANUAL RANGE
2000 PPM
1000 PPM
500 PPM