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3. Remove the cover of the photometer and check for the presence of the following
voltages on the UV lamp power supply PCA (see Figure 6-16):
• +4500 mVDC ± 10 mVDC between TP1 and TP4 (grnd)
• +5VDC between TP3 and TP4 (grnd)
• If the above voltages check out, it is more likely that a problem is due to the UV lamp
5.7.14 T
ROUBLESHOOTING THE
The only significant components of the O
the power supply assembly for the UV source lamp and the lamp itself. The lamp power
supply for the IZS Option's O
lamp power supply. The method for checking it out is identical to that listed in Section
5.7.13 above.
5.7.15 S
ERVICE
This contains procedures that might need to be performed on rare occasions when a major
component of the analyzer requires repair or replacement.
5.7.15.1
REPAIRING SAMPLE FLOW CONTROL ASSEMBLY
The critical flow orifice is housed in the flow control assembly (Teledyne API P/N
001760400) located on the top of the optical bench. A sintered filter protects the jewel
orifice so it is unusual for the orifice to need replacing, but if it does, or the filter needs
replacement please use the following procedure (see the Spare Parts list in Appendix B
for part numbers and kits):
1. Turn off power to the analyzer.
2. Locate the assembly attached to the sample pump.
3. Disconnect the pneumatic connection from the flow assembly and the assembly
4. Remove the fitting and the components as shown in the exploded view below.
5. Replace the o-rings (P/N OR0000001) and the sintered filter (P/N FL0000001).
6. If replacing the critical flow orifice itself (P/N 000941000), make sure that the side
7. Apply new Teflon
8. Re-assemble in reverse order.
9. After reconnecting the power and pneumatic lines, flow check the instrument as
132
If this voltage is incorrect, either the UV lamp power supply PCA is faulty
•
or the I
C bus is not communicating with the UV lamp power supply PCA.
2
If this voltages is less than 4.8 or greater than 5.25 either the 5 VDC
•
power supply or the UV lamp power supply PCA are faulty.
than due to the lamp power supply.
Replace the lamp and if the problem persists, replace the lamp power
•
supply.
IZS O
generator is the same assembly used for the photometer's
3
P
ROCEDURES
from the pump.
with the colored window (usually red) is facing downstream to the gas flow.
tape to the male connector threads.
®
described in Section 5.6.6.
Teledyne API – Model T400 O
'
O
G
PTION
S
ENERATOR
3
generator that might reasonably malfunction is
3
Analyzer
3
083730400A DCN8130
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Table of Contents
Troubleshooting
