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

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5-36 | Model 920 Multi-Gas Analyzer
9. Replace the Optical Bench/Measuring Cell Assembly in the analyzer:
Ensure there is no power being supplied to the analyzer while install-
ing the Optical Bench.
a. 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.
b. Connect Optical Bench wiring:
Ribbon cable from J102 on Micro-Interface board to J100 on Optical
Bench board.
AC power line (connector plug) to TB100 on Optical Bench board.
Connect the yellow/green ground wire using the disconnect
terminals.
c. Optional: If using, connect the purge line (black tube) to the
Optical Bench Purge Fitting.
10. 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.
!
WARNING