Analytical Industries GPR-7500 AIS Trace PPM Hydrogen Sulfide Analyzer - Manual (Page 25)

Advanced Instruments, Inc.
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6. The default setting of 100 illustrates no adjustment to the 4 mA signal. Adjust the initial value to above
100 to increase the analog signal value or decrease it below 100 to decrease the analog signal.
7. Press the ENTER key to advance the underline cursor right or press the MENU key to advance the
underline cursor left to reach to the desired digit.
8. Press the ARROW keys to change the value.
9. Press ENTER to accept 4 mA offset.
10. If 4 mA is still off, repeat steps 7 through 9 until the output is 4 mA .
After adjustment, the system automatically returns to the SAMPLING mode.
Span Calibration Procedure
This procedure assumes a span gas under positive pressure.
To assure an accurate calibration, the temperature and pressure of the span gas must closely match with
the sample gas.
For calibration purposes, use of the AUTO SAMPLE mode is recommended.
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 following displays appear:
4. Return to the MAIN MENU by pressing the MENU key.
5. Advance the reverse shade cursor using the ARROW keys to highlight CALIBRATION.
6. Press the ENTER key to select the highlighted menu option.
7. Repeat to select SPAN CALIBRATE
The following displays appear:
1 0 0
OUTPUT ZERO OFFSET
PRESS UP OR DOWN
TO CHANGE VALUE
ENTER TO SAVE
MENU TO RETUE
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATION
CONFIG ALARMS
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
CALIBRATION
SPAN CALIBRATE
ZERO CALIBRATE
DEFAULT SPAN
DEFAULT ZERO
OUTPUT SPAN
OUTPUT ZERO