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Model 9110T NOx Analyzer Principles of Operation
Teledyne Analytical Instruments 346
seated in their sockets and prevent accidental contact with those sockets that are not
populated see Figure 13-16).
Never remove this retainer while the instrument is plugged in and turned on. The
contacts of the AC relay sockets beneath the shield carry high AC voltages even
when no relays are present.
A
C Relay
Retainer Plate
Retainer
Mounting
Screws
Figure 13-16: Relay PCA P/N 045230100 with AC Relay Retainer in Place
13.3.4.1. Status LED’s
Eight LED’s are located on the analyzer’s relay PCA to show the current status on the various control
functions performed by the relay PCA (see Figure 13-17). They are: