Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 272)

Model 9110TH NOx Analyzer Troubleshooting & Repair
Teledyne Analytical Instruments 252
7.7. 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 7-20: 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.
AC Relay Retain Occludes
Mounting Screw on
P/N 045230200
Mounting
Screws
Figure 7-21: Relay PCA Mounting Screw Locations