Analytical Industries GPR-7500 AIS Trace PPM Hydrogen Sulfide Analyzer - Manual (Page 23)

Advanced Instruments, Inc.
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offset does not exceed 50% of the lowest range, this indicates that the integrity of the sensor, the
analyzer/transmitter sample system and the sample line bringing in the sample gas is maintained.
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.
The following displays appear:
4. Advance the reverse shade cursor using the ARROW keys to highlight ZERO CALIBRATE.
5. Press the ENTER key to select the highlighted menu option.
The following displays appear:
6. Press the ENTER key to calibrate or MENU key to abort and return to SAMPLING mode.
7. Allow approximately 60 seconds for the calibration process while the microprocessor determines
whether the signal output or reading has stabilized within 50% of the full scale low range. If the offset is
less than 50% of the lowest range, by pressing ENTER, message PASSED CALIBRATION will appear
and return to the Sample mode. On the other hand, if the offset is above 50%, pressing ENTER,
message FAILED CALIBRATION will appear and the analyzer will return to Sample mode without
completing the Zero calibration.
Both the Zero Calibrate and Span Calibrate functions result in the following displays:
Factory Default Zero Calibration
The feature will eliminate any previous zero calibration adjustment and display the actual signal output of the
sensor at a specified oxygen concentration. For example, assuming a zero gas is introduced, the display
above 0.00% will reflect an actual zero offset. This feature allows the user to ensure that the accumulative
zero offset never exceeds 5-20% of the lowest range limit. To perform Default Zero,
1. Access the MAIN MENU by pressing the MENU key.
MAIN MENU
AUTO SAMPLE
MSNUAL SAMPLE
CALIBRATION
CONFIG ALARMS
BYPASS ALARMS
CALIBRATION
SPAN CALIBRATE
ZERO CALIBRATE
DEFAULT SPAN
DEFAULT ZERO
OUTPUT SPAN
OUTPUT ZERO
ZERO
CALIBRATION
ENTER TO CALIBRATE
MENUE TO ABORT
PASSED CALIBRATION FAILED CALIBRATION