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Theory of Operation M400E Ozone Analyzer Operator’s Manual
The most commonly used version of the Relay PCA installed in the M400E analyzer does not include the AC
relays used in instruments where there are AC powered components requiring control. A plastic insulating
safety shield covers the empty AC Relay sockets.
CAUTION
Electrical Shock Hazard
NEVER REMOVE THIS SAFETY SHIELD 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
AC Relay
Safety Shield
Figure 11-7: Relay PCA P/N 045230100 with Safety Shield In Place
On instruments where the optional Metal Wool Scrubber is installed, the relay PCA includes a solid state AC
relay (see Figure 11-6). A retainer plate is installed over the relay to keep them
securely seated in their sockets.
AC Relay
Retainer Plate
Retainer
Mounting
Screws
Figure 11-8: Relay PCA P/N 045230200 with AC Relay Retainer in Place
202 04315 Rev. C1