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5.7.13 T
ROUBLESHOOTING THE
This section involves checking the measure/reference valve and the photometer UV lamp
power supply.
5.7.13.1
CHECKING THE MEASURE/REFERENCE VALVE
To check the function of the photometer's measure / reference valve:
1. View the O3 REF function in the Dashboard (Setup>Dashboard to configure).
2. Follow the instruction in Section 4.2.1.1 for performing a zero point calibration check.
• Press ZERO and allow the analyzer to stabilize.
3. Note the displayed value.
4. Follow the instruction in Section 4.2.1.2 for performing a span point calibration check.
• Press SPAN and allow the analyzer to stabilize.
5. Note the displayed value for O3 REF.
• If the O3 REF value has decreased by more than 2 mV from its value with zero gas,
• Press the EXIT button to interrupt the span point calibration process (DO NOT
5.7.13.2
CHECKING THE PHOTOMETER UV LAMP POWER SUPPLY
Although it is not always possible to determine with certainty whether a UV lamp
problem lies with the lamp or with its power supply, 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 5.7.9.2
083730400A DCN8130
P
HOTOMETER
then there is a "cross-port" leak in the M/R valve or a bad O
Refer to Section 5.7.15.2 for replacement instructions.
PRESS the ENTR button).
WARNING – ELECTRICAL SHOCK HAZARD
Hazardous voltage present - use caution.
CAUTION – UV RADIATION RISK
Do not look at the UV lamp while the unit is operating. UV light can
cause eye damage. Always use safety glasses made from UV
blocking material when working with the UV Lamp Assembly.
(Generic plastic glasses are not adequate).
Teledyne API – Model T400 O
reference scrubber.
3
Analyzer
3
131
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Table of Contents
Troubleshooting
