Emerson Process Management 755R manual 60

Instruction Manual

748213-S April 2002

6-4 DETECTOR CHECK

To isolate the detector as the problem, it is necessary to check the source lamp, photo- cells, and suspension (see Figure Figure

6-1B, page 6-3). These components are connected via J12 on the optical bench assembly.

Pin/leads may be removed from connector J12 by use of an improvised pin removal tool, such as a paper clip (see Figure 6-2 below).

Model 755R

Connect J12 has slots at top and bottom. To remove a connector pin/lead, insert the tool into the upper or lower slot and push down on the end to release the keeper on the pin.

When inserting a pin/lead, its keeper must face toward the slot opening in the connector in order to lock in. If inserted otherwise, the pin/lead will be forced out when the two connectors are joined.

Upper Slot	Keeper
Side View	Connector Pin Removed
of Connector
	Connector Pin/
	Leads in Place
Lower Slot
	Improvised Pin Removal Tool, Such as a Paper Clip

Figure 6-2. Pin/Lead Removal

		WHT	RT1
		WHT
		BLK	HR2
		BLK	Suspension
			Heater
		PUR	Suspension
		GRN
10			Terminals
	18
J12		1

When dual photocell is installed, the gap between the two photocells should be in position indicated by this line.

Hole for Source Lamp

Optical Bench

Figure 6-3. Detector Optical Bench

6-4 Maintenance and Service Rosemount Analytical Inc. A Division of Emerson Process Management