5-52 | Model 900 ADA / Model 930 Sulfur Pit Analyzers
18. Install the Measuring Cell in the Analyzer Oven:
a. Open the Oven door. Swing the Optical Bench toward the
Electronics Enclosure and then swing the Measuring Cell toward
the Oven (Figure 5-6).
Align the hole in the Heat Transfer Block with the Cell RTD tip on
the Heater Plate and carefully push the Measuring Cell toward the
RTD. Adjust the entire Measuring Cell/Optical Bench Assembly as
required to firmly seat the Measuring Cell against the Heater Plate.
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.
NOTE
NOTE
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