Analytical Industries GPR-1800 AIS ATEX Trace PPM Oxygen Analyzer - Manual (Page 24)

Advanced Instruments Inc.
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7. The following display appears and after 3 seconds the system returns to the SAMPLING mode:
FACTORY
DEFAULTS
SET
3.3
PPM
AUTO SAMPLING
10 PPM RANGE
24.5 C 100 KPA
LO1 2PPM 10PPM HI2
Output Zero
In rare instances the 4-20mA signal output may not agree to the reading displayed by the LCD. This feature enables the user to
adjust the 4mA signal output when the LCD displays 00.00. Note: Adjust the 20mA signal output with the OUTPUT SPAN.
1. Access the MAIN MENU by pressing the MENU key.
2. Advance the reverse shade cursor using the ARROW keys to highlight CALIBRATION.
3. Press the ENTER key to select the highlighted menu option.
4. The following displays appear:
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATION
CONFIG ALARMS
BYPASS ALARMS
>>>
CALIBRATION
SPAN CALIBRATE
ZERO CALIBRATE
DEFAULT SPAN
DEFAULT ZERO
OUTPUT SPAN
OUTPUT ZERO
5. Advance the reverse shade cursor using the ARROW keys to highlight DEFAULT ZERO.
6. Press the ENTER key to select the highlighted menu option.
7. The following display appears:
100.0
OUTPUT ZERO OFFSET
PRESS UP OR DOWN
TO CHANGE VALUE
ENTER TO SAVE
MENU TO RETURN
8. Compute the adjustment value as described in Appendix B or consult the factory. The true adjustment value must be
determined empirically by trial and error. Adjust the initial adjustment value for additional percent errors.
090.0
OUTPUT ZERO OFFSET
PRESS UP OR DOWN
TO CHANGE VALUE
ENTER TO SAVE
MENU TO RETURN
9. 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 of the OUTPUT ZERO OFFSET value.
10. Press the ARROW keys to enter the OUTPUT ZERO OFFSET value.
11. Repeat until the complete OUTPUT ZERO OFFSET value has been entered.
12. Save the adjustment value by pressing the ENTER key or abort by pressing the MENU key.
13. The system returns to the SAMPLING mode.