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7.2 Periodical inspection
7.2.1 How to clean sample cell (pipe cell)
This instrument has been carefully adjusted before shipment from the factory. If it should require
readjustment, then please contact Fuji.
(1) Turn off the power switch, stop the flow of
sample gas and flow zero gas for a few
minutes.
Loosen the knurled knobs on the front
panel and pull out the analyzer interior by
means of the grips.
(2) Loosen the cap nuts fixing the gas inlet
pipe, and detach the internal gas inlet pipe.
(3) Remove the screws from the left and right
cell retaining places.
• In the case of the sample switching type,
remove both the sample and reference
cells.
• With the standard type, remove only the
sample cell.
(4) Turn the retaining ring (with transparent
window) to the left and remove it from the
cell. Refer to Fig. 7-1.
(5) For cleaning the infrared-ray transmitted
window and cell interior, first remove
heavy contamination with a soft brush or
the like, then wipe lightly with a soft cloth.
Be especially careful when cleaning the
window since it is easily scratched.
(6) When cleaning of the sample cell is finished, then reassemble the cell in its original position.
If the zero point has deviated considerably when operating again, select a low range and carry
out optical zero adjustment (refer to item 7.2.3).
Also, the drift integrated value should be cleared (see Item 6
⑤
).
If the infrared-ray transmitting window is only lightly contaminated, it can be cleaned by wiping
lightly with the soft cloth to which chrome oxide powder is added. But if heavily contaminated,
the window must be replaced.
Be careful not to apply unreasonable force when cleaning.
Knurled
knob
Power switch
Knurled knob
Sample cell
Reference
cell
Cap nut
fixing gas
inlet pipe
Cap nut
fixing gas
inlet pipe
Cell
retaining
plate
Cell
retaining
plate
Screw
Screw
Retaining ring
O ring
CAUTIONS
