Analytical Industries GPR-7500 AIS Trace PPM Hydrogen Sulfide Analyzer - Manual (Page 26)

Advanced Instruments, Inc.
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8. After selecting the SPAN CALIBRATION, the following displays appear:
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 alarm value.
10. Repeat until the complete span value has been entered and press ENTER. The following display will
appear.
11. Press the ENTER key to accept SPAN CALIBRATION. After successful calibration, the analyzer will
display a message “PASSED CALIBRATION” and return to the Sample mode.
NOTE: The analyzer is allowed to accept calibration only when O2 reading is within 50% of the span gas
value. If the O2 reading is outside of this limit, by pressing ENTER to ac
cept calibration will result in “FAILED
CALIBRATION ” and the analyzer will return to the Sample mode without completing Span calibration.
If the calibration is unsuccessful, return to the SAMPLING mode with span gas flowing through the
transmitter, make sure the reading stabilizes, reaches within 30-50% (see below) of the span gas value
(after factory default span setting) and repeat the calibration before concluding the equipment is defective.
Before disconnecting the span gas line and connecting the sample gas line (if the analyzer is not equipped
with a SPAN/SAMPLE vale option), flow the sample gas for 1-2 minutes to purge the air inside the sample
line. Disconnect the span gas line and replace it with the sample gas line.
Factory Default Span
With factory default span, previous calibration data stored in the memory is removed and the sensitivity of
the analyzer is reset to the value based on the average output of the oxygen sensor at a specific oxygen
concentration. For example, with factory default settings, when a span gas is introduced, the micro-
processor will display oxygen reading within 30-50% of the span gas value, indicating that the sensor output
is within the specified limits. This feature allows the user to check
the sensor’s signal output without
removing it from the sensor housing.
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 display appears:
0000 PPM
PRESS UP OR DOWN
TO CHANGE VALUE
ENTER TO SAVE
MENUE TO ABORT
625 PPM
SPAN
CLAIBRATION
ENTER TO CALIBRATE
MENU TO ABORT
PASSED CALIBRATION PASSED CALIBRATION