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T400 Ozone Analyzer Operator’s Manual Troubleshooting & Service
267
12.8. TROUBLE SHOOTING THE PHOTOMETER
12.8.1. CHECKING MEASURE / REFERENCE VALVE
To check the function of the photometer’s measure / reference valve:
1. Set the analyzer’s front panel display to show the O3 REF test function (see
Section 4.1.1).
2. Follow the in
struction in Section 9.2.3 for performing a zero point calibration.
Press
ZERO and allo
w the analyzer to stabilize.
3. Before completing the calibration by pressing the ENTR button, note the displayed
value.
4. Press the EXIT button to interrupt the zero point calibration process (DO NOT
PRESS the ENTR button).
5. Follow the instruction in Sections Section 9.2.3 for performing a span point
calib
ration of
the photometer.
Press SPAN and allow the analyzer to stabilize.
6. Before completing the calibration by pressing the ENTR button, note of the
displayed value of O3 REF.
If the O
3
REF value has decreased by more than 2 mV from its value with zero
gas, then there is a "cross-port" leak in the M/R valve or a bad O
3
reference
scrubber. Refer to Section 12.10.2 for replacement instructions.
7. Press the EXIT button to interrupt the sp
an point calibration process (DO NOT
PRESS the ENTR button).
06870C DCN6332