Teledyne GFC-7001E - Trace CO Analyzer - Manual (Page 299)

Troubleshooting & Repair Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 299
13.6. REPAIR PROCEDURES
This contains procedures that might need to be performed on rare occasions when a major component of the
analyzer requires repair or replacement.
13.6.1. REPAIRING SAMPLE FLOW CONTROL ASSEMBLY
The critical flow orifice is housed in the flow control assembly (Teledyne 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. See Figure 3-4.
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 upstream to the flow 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
12.3.4.
Pneumatic Connector, Male 1/8”
(P/N FT_70
Spring
(P/N HW_20)
Sintered Filter
(P/N FL_01)
Critical Flow Orifice
(P/N 00094100)
Make sure it is placed with the
jewel down)
O-Ring
(P/N OR_01)
Purge Housing
(P/N 000850000)
Figure 13-14: Critical Flow Restrictor Assembly Disassembly