General Troubleshooting & Service Teledyne API T703/T703U Calibrator Operation Manual
178
8.7. REPAIR PROCEDURES
REPAIRING SAMPLE FLOW CONTROL ASSEMBLY 8.7.1.
The critical flow orifice is housed in the flow control assembly (Teledyne API
part number: 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 calibrator.
2. Locate the assembly to be repaired, see Figure 9-1 (T703) or Figure 9-2
(T703U).
3. Disconnect the pneumatic connection from the flow assembly.
4. Remove the fitting and the components as shown in the exploded view in
Figure 8-5.
5. Replace the o-rings (p/n OR000001) and the sintered filter (p/n FL000001).
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. Reassemble in reverse order.
Pneumatic Connector, Male 1/8”
(P/N FT_70
Sintered Filter
(P/N FL_01)
Critical Flow Orifice
(P/N 000941000)
Make sure it is placed with the
jewel down)
Purge Housing
(P/N 000850000)
Figure 8-5: Critical Flow Restrictor Assembly Disassembly
DISK-ON-MODULE REPLACEMENT PROCEDURE 8.7.2.
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