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

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Maintenance and Troubleshooting
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5-13
a. Install (1) new o-ring (P/N 100-1911) in the groove on the flat sur-
face of the Reflector Block.
Hold the Measuring Cell vertically with the Reflector Block end
up and install (1) new o-ring (P/N 100-1911) and Window (P/N
300-0281).
Orient the Reflector Block with its “peak line” at 90° to a line
through the fittings and place it on the Measuring Cell. Ensure the
Window does not slide out of position when the Reflector Block is
placed against the Measuring Cell.
It is critical to reassemble the Reflector Block in the exact orientation
as it was assembled at the factory.
Secure the Reflector Block to the Measuring Cell with (3) M4 x 20
screws. Tighten the screws evenly.
b. Install (1) new o-ring (P/N 100-1911) in the Heat Transfer Block.
Hold the Measuring Cell vertically with the Heat Transfer Block
end up and install (1) new o-ring (P/N 100-1911) and Window (P/N
300-0281).
Orient the Heat Transfer Block with the Heat Transfer Block Plug
access hole at 90° to a line through the fittings (the two larger-
diameter holes in the Measuring Cell must align with the two
larger-diameter holes in the Heat Transfer Block). Connect it to the
Measuring Cell with (3) M4 x 12 screws. Tighten the screws evenly.
8. Reconnect the Measuring Cell to the Optical Bench and secure it to
the Cell RTD on the Oven Heater Plate:
a. Orient the Measuring Cell with the Reflector Block to the left, the
sample tube fittings vertical, and the Heat Transfer Block Plug ac-
cess hole facing away from the analyzer. Reconnect the Measuring
Cell to the Cell Extension (on the Optical Bench) using (3) M4 x 12
screws. Tighten the screws evenly.
b. Swing the Optical Bench/Measuring Cell toward the Oven.
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.
!
CAUTION