Analytical Industries GPR-1600 MS Series PPB Oxygen Analyzer - Manual (Page 30)

Advanced Instruments Inc.
30
recommended only when performing a ZERO CALIBRATION and during troubleshooting and should not be repeated before
routine subsequent SPAN CALIBRATION.
¾ If a ZERO CALIBRATION adjustment has NOT been made as described above, perform the DEFAULT ZERO and DEFAULT
SPAN functions when troubleshooting an analyzer and before SPAN CALIBRATION.
¾ ZERO CALIBRATION is not practical and not recommended for portable analyzers or measurements on higher ranges.
However, satisfying these users that the zero offset is acceptable for their application without the 24 hour wait can be
accomplished by introducing a zero gas (or sample gas with a low ppm oxygen concentration) to the analyzer. Unless the
zero gas is contaminated or there is a significant leak in the sample connections, the analyzer should read less than 100
ppm oxygen within 10 minutes after being placed on zero gas thereby indicating it is operating normally.
Procedure:
After allowing the analyzer reading to stabilize on good quality zero gas as described above, perform the ZERO CALIBRATION
function as follows:
1. Assembly the required components as described under Installing Span (applies to zero) Gas section above.
2. Access the MAIN MENU by pressing the MENU key.
3. The following display appears:
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATION
CONFIG ALARMS
BYPASS ALARMS
4. Advance the reverse shade cursor using the ARROW keys to highlight CALIBRATION
5. Press the ENTER key to select the highlighted menu option.
6. The following display appears:
CALIBRATION
SPAN CALIBRATE
ZERO CALIBRATE
DEFAULT SPAN
DEFAULT ZERO
OUTPUT SPAN
OUTPUT ZERO
7. Advance the reverse shade cursor using the ARROW keys to highlight DEFAULT ZERO.
8. Press the ENTER key to select the highlighted menu option.
9. The following display (below left) 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
LO1 2 PPM 10 PPM HI2
10. Repeat steps 1 through 4 above.