Teledyne T400, Руководство пользователя, Страница: 134 / 177

132 Teledyne API – Model T400 O
3
Analyzer 083730400A DCN8130
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)
•
If this voltage is incorrect, either the UV lamp power supply PCA is faulty
or the I
2
C bus is not communicating with the UV lamp power supply PCA.
• +5VDC between TP3 and TP4 (grnd)
•
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.
• If the above voltages check out, it is more likely that a problem is due to the UV lamp
than due to the lamp power supply.
• Replace the lamp and if the problem persists, replace the lamp power
supply.
5.7.14 T
ROUBLESHOOTING THE
IZS O
PTION
’
S
O
3
G
ENERATOR
The only significant components of the O
3
generator that might reasonably malfunction is
the power supply assembly for the UV source lamp and the lamp itself. The lamp power
supply for the IZS Option’s O
3
generator is the same assembly used for the photometer’s
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
P
ROCEDURES
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
from the pump.
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
with the colored window (usually red) is facing downstream to the gas flow.
7. Apply new Teflon
®
tape to the male connector threads.
8. Re-assemble in reverse order.
9. After reconnecting the power and pneumatic lines, flow check the instrument as
described in Section 5.6.6.