Metek 920, Operator'S Manual With Essential Health And Safety Requirements

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Maintenance and Troubleshooting
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5-47
Replace the (4) lock washers and M6 x 35 screws to secure the Heater
Plate to the Oven wall. Gently push and pull on the Heater Plate
while tightening the screws, to ensure it is properly seated against the
Oven wall.
Tighten the gland nut on the Seal Body.
16. Terminate all wiring to Terminal Strips J1, J2 on the Heater
Termination board, as per your notes (see also Figure 5-10).
Slide the Seal Cover over the Seal Body and secure it with (2) M6 x 16
and (2) M6 x 40 screws. Replace the retaining ring in the groove in the
Thermal Insulating Tube.
Replace the Oven Plug.
17. If the Aspirator/Sample Line Bracket was removed, replace it on the
Heater Plate (2 screws).
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.

NOTE