Maintenance and Troubleshooting | 5-37
Using a flat hex key, replace the M4 x 25 screw in the counter
bore hole in the Heat Transfer Block and thread it onto the Cell
RTD (until it is snug). Do not use a ball driver. Do not tighten the
screw at this time.
IMPORTANT
Positioning of the Heat Transfer Block in the Oven is critical.
Improper positioning of the Heat Transfer Block can result in:
• Poor contact between the Cell RTD tip and the Heat Transfer
Block.
• Poor alignment of the Cell Extension seal in the Oven and
Electronics Enclosure cabinets.
b. Adjust the Measuring Cell/Optical Bench Assembly so that the sili-
con seal on the Cell Extension fits firmly into the molded depres-
sions in the Oven and Electronics Enclosure walls.
Temporarily close the Electronics Enclosure door and tighten its
screws to secure the Optical Bench in place.
While closing the Electronics Enclosure door, verify that proper verti-
cal alignment of the Optical Bench is maintained.
If necessary, vertically align the Optical Bench by loosening the
Optical Bench support bracket from the backpan and moving the
Optical Bench up or down as required. After aligning the Optical
Bench, retighten the support bracket.
c. Verify there is no clearance between the Heat Transfer Block and
the Cell RTD. The Measuring Cell must feel secure against the
Heater Plate. Gently push and pull on the Measuring Cell to verify
it is not loose.
If there is any movement, tighten the M4 x 25 screw again until the
Measuring Cell does not move, being careful not to over tighten it.
Over-tightening this screw will damage the threads on the RTD.
d. Replace the Heat Transfer Block Plug in the Heat Transfer Block.
e. Connect the sample tubing to the Measuring Cell.
NOTE
NOTE
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