YOKOGAWA IR400 series, User Manual

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<7. MAINTENANCE>
7-4
IM 11G02N01-01E
7.3.2 Cleaning method for sample cell (block cell)
Top cover
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(1) Turn off the power switch, stop the
sample gas, and allow the zero gas to
flow for several minutes to purge the
cell interior.
Loosen the setscrew (2 pieces) from
the top cover and remove it.
(2) Remove the internal gas inlet tube.
(3) Loosen the 2 detector set bolts.
Note) The distribution cell, block cell and
detector are fastened by the same bolts.
(4) Using the furnished cell mounting tool,
Gas inlet tube set cap nut
Detector set bolt
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turn the window fixture to the left and
remove it from the cell. (See the
structure of sample cell (block cell) in
Fig. 7-2.)
(5) For cleaning the infrared transmission
window and cell inside surface, first
eliminate coarse dust by soft brush or
the like and then wipe them by soft rag.
The window is easy to get scratched.
Pay utmost attention so as not to
damage it.
Infrared transmission window
Inner O ring
Outer O ring
O ring holder
Window fixture
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(6) After the end of sample cell cleaning,
mount the cell in place and proceed to
running.
After cleaning sample cell, be sure to
perform optical zero adjustment (see
Item 7.3.3) and moisture interference
compensation adjustment (see Item
7.3.4).
If the window or the cell interior is very dirty, use a soft cloth moistened with absolute alcohol.
A slightly corroded infrared transmission window or sample cell can be remedied by gently rubbing
with chromium oxide powder on cleaning cloth but an excessively corroded one must be replaced.
When cleaning, do not exert an excessive stress.
Caution