Teledyne API T803 CO2/O2 Analyzer Operation Manual Troubleshooting and Service
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11.6.12. CO2 SENSOR STATUS LED’S

There are Two LEDs located on the CO2 sensor PCA.
Figure 11-6: Location of Diagnostic LEDs on CO2 Sensor PCA
Normal Operation: V8 is not lit – V9 is Blinking
Error State: Both LEDs are blinking.
Check to make sure that the cable to the CO2 sensor is properly connected.

11.7. 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.

11.7.1. REPAIRING SAMPLE FLOW CONTROL ASSEMBLY

The critical flow orifice is housed in the flow control assembly (Teledyne API PN
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 3-5.
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 (PN OR0000001) and the sintered filter (PN FL0000001).
6. If replacing the critical flow orifice itself (PN 000940700), make sure that the
side with the colored window (usually red) is facing downstream to the flow
gas flow.
7. Apply new Teflon® tape to the male connector threads
8. Re-assemble in reverse order.
07276B DCN6418