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Model 9110T NOx Analyzer Troubleshooting & Service
Teledyne Analytical Instruments 315
25. Leak check the system (see Section 13.3.12).
26. Turn ON the analyzer.
27. Verify the basic operation of the analyzer using the ETEST(12.7.12.2) and OTEST
features (12.7.12.1) or zero and span gases, then carry out a hardware calibration
of the analyzer followed by a zero/span point calibration (See Section 9.4.3.2).
12.8.6. REMOVING / REPLACING THE RELAY PCA FROM THE
INSTRUMENT
This is the most commonly used version of the Relay PCA. It includes a bank of solid state AC relays.
This version is installed in analyzers where components such as AC powered heaters must be turned ON
& OFF.
A retainer plate is installed over the relay to keep them securely seated in their sockets.
AC Relay
Retainer Plate
Retainer
Mounting
Screws
Figure 12-10: Relay PCA with AC Relay Retainer In Place
The Relay retainer plate installed on the relay PCA covers the lower right mounting screw of the relay
PCA. Therefore, when removing the relay PCA, the retainer plate must be removed first.