3-8 | Model 900 ADA / Model 930 Sulfur Pit Analyzers
Installing the Optical Bench Assembly
The Optical Bench Assembly – shipped in a separate box – must be in-
stalled in the analyzer’s Electronics Enclosure after the analyzer has been
installed.
All electrical connections to the Optical Bench are made via pre-wired
connector plugs. No hard wiring is required.
To install the Optical Bench (Figures 3-2, 3-3, and 3-4):
Ensure there is no power being supplied to the analyzer while install-
ing the Optical Bench.
1. The Measuring Cell comes installed in the Analyzer Oven. Before
installing the Optical Bench, first remove the Measuring Cell from the
Oven and connect it to the Optical Bench. To do this:
a. Open the Oven and disconnect the Sample and Vent Line tubes
from their fittings on the Measuring Cell.
b. Remove the Heat Transfer Block Plug from the counter bore hole
in the Heat Transfer Block (Figure 3-4). Grasp the Measuring Cell
and remove the M4 x 25 screw inside the Heat Transfer Block
using only a flat hex key. Do not use a ball driver – the head can
break off inside the screw.
Remove the Measuring Cell and set it aside.
c. Remove the Optical Bench from its shipping box and then from its
ESD-safe packaging.
Remove the (3) M4 x 12 screws from the Beam Splitter (part of the
Optical Bench) – Figure 3-4.
Remove the dust cover and the Installation Tag from the
Measuring Cell. Use the (3) M4 x 12 screws to secure the Cell
Extension to the Beam Splitter on the Optical Bench.
2. Open the Electronics Enclosure and locate the blue Support Arm Yoke,
in the top-left corner of the Electronics Enclosure. Loosen the set screw
securing the outermost pivot pin in the Support Arm Yoke and remove
the pin.
With the blue Support Arm Yoke fully extended, lift the Optical Bench/
Measuring Cell Assembly by its upper portion and carefully move it
toward the analyzer. Align its Optical Bench Support Plate with the
Support Arm Yoke and replace the pivot pin. Tighten the set screw.
The Optical Bench should swing freely.
!
WARNING
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