6-54 | Model 933S UV Analyzer
e. Replace the new Drive Belt (o-ring, P/N 300-1528) by first placing
it in the Chopper Wheel groove and then rolling it over the Pulley
and into the groove. Use care to avoid stretching the Drive Belt.
Rotate the Chopper Wheel to ensure the Belt is properly seated
in the Chopper Wheel and Pulley grooves, and to make sure the
Bearings and other parts are properly aligned.
f. Align the two halves of the Chopper Assembly and secure them
using (4) M3 x 8 screws.
7. Replace the Optical Bench in the Upper Enclosure:
Ensure there is no power being supplied to the analyzer while install-
ing the Optical Bench.
While installing the Optical Bench in the Upper Enclosure, take care
not to damage the enclosure’s joining areas (flamepath).
a. With the Lower/Upper Cam Pins in the “LOOSE” position, care-
fully replace the Optical Bench in the Upper Enclosure and install
the assembly’s Optical Bench Mount over the Cell Window Hous-
ing mount.
While holding the Optical Bench by its upper portion with one
hand, rotate the Lower Cam Pin counter-clockwise and the Upper
Cam Pin clockwise until they are tight (“CLAMPED” position).
The Cam Pins must stay aligned while the Optical Bench is being
installed in the enclosure. The lined groove on the head of each Cam
Pin must be parallel to the Measuring Cell until the Optical Bench is
in place.
b. Connect the terminals of the green/yellow ground wire.
c. Connect the following wiring connectors to the Micro-Interface
board:
• Measuring Cell RTD line to J300.
• RS-422 communication line to J104.
• Micro-Interface AC power line to J200.
• DC power line to J103.
!
CAUTION
!
WARNING
NOTE
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