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General Troubleshooting & Repair of the M400E Analyzer M400E Ozone Analyzer Operator’s Manual
13.8. TROUBLE SHOOTING THE PHOTOMETER
13.8.1. 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 6.2.1).
2. Follow the instruction in Section 9.2.3 for performing a zero point calibration.
Press
ZERO and allow the analyzer to stabilize.
3. Before completing the calibration by pressing the
ENTR key, note of the displayed value.
4. Press the
EXIT key to interrupt the zero point calibration process (DO NOT PRESS the ENTR key).
5. Follow the instruction in Sections Section 9.2.3 for performing a span point calibration of the
photomete
r.
Press
SPAN and allow the analyzer to stabilize.
6. Before completing the calibration by pressing the
ENTR key, 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
scrubber.
7. Press the EXIT key to interrupt the span point calibration process (
DO NOT PRESS the ENTR key).
13.8.2. CHECKING THE PHOTOMETER UV LAMP POWER SUPPLY
NOTE
A schematic and physical diagram of the Lamp Power Supply can be found in Appendix D.
CAUTION
Electrical Shock Hazard
Hazardous voltage present - use caution.
It is not always possible to determine with certainty whether a problem is the result of the UV Lamp or the lamp
power supply, however, the following steps will provide a reasonable confidence test of the lamp power supply.
1. Unplug the cable connector at P1 on the lamp power supply and confirm that +15VDC is present
between Pins 1 and 2 on the cable connector.
2. If this voltage is incorrect, check the DC test points on the relay PCA as described in Section 13.7.2.
254 04315 Rev. C1