5-10 | Model 900 ADA / Model 930 Sulfur Pit Analyzers
4. GP Analyzers Only:
Turn off the Instrument Air supply to the analyzer and then close the
Aspirator Air valve.
Purged Analyzers:
The Instrument Air supply must always remain on for the Purge
Bypass Switch to operate properly.
5. After the Oven has cooled down enough to work on, disconnect the
Measuring Cell from the Heater Plate and remove it from the Oven:
The analyzer sample system will be under positive pressure; take
precautions to avoid injury.
a. Disconnect the Measuring Cell tubing.
b. Remove the Heat Transfer Block Plug from the Heat Transfer Block
and then remove the M4 x 25 screw using only a flat hex key. Do
not use a ball driver – the head can break off inside the screw.
c. Wearing insulated gloves, grasp the Measuring Cell and carefully
pull it straight out from the Heater Plate and Cell RTD (Figure
5-9). Once the Measuring Cell has cleared the Cell RTD, swing the
Optical Bench Assembly outward, away from the analyzer.
d. Remove the (3) M4 x 12 screws that secure the Heat Transfer Block
to the Cell Extension and remove the Measuring Cell.
To help maintain the temperature inside the Oven, close the Oven
door while working on the Measuring Cell.
6. Disassemble and clean the Measuring Cell:
When disassembling the Cell, note the orientation of the Cell parts. It
is critical to reassemble the Cell parts later in the exact orientation as
they were assembled at the factory. After removing the Cell parts, set
them on a clean, lint-free cloth.
If the Measuring Cell has a Mirror or Window/Mirror combina-
tion, be careful not to touch the Mirror/Reflective surface with
your fingers, scratch or rub the Mirror, or use water on the Mirror.
a. Hold the Measuring Cell vertically with the Heat Transfer Block up-
ward and remove the (3) M4 x 12 screws that secure the Heat Transfer
Block to the Measuring Cell. Remove the Heat Transfer Block.
Grasp the edge of the Cell Window and carefully remove it, then
set it aside on a soft, non-abrasive cloth. Remove the (2) o-rings.
!
WARNING
!
CAUTION
The Purge Bypass
Switch must be in the
“BYPASS” position.
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