Section 10
Model 601/601P/602/602P/603 NDIR Analyzer
California Analytical Model 600_NDIR_Series_v10.0 CE
Operators Manual
Page 66 of 86
10.6.
Disassembly of Combination Pipe & Block Type Cells
(Figure 10-3)
1)
Discontinue the sample gas flow. When it contains harmful gas, purge the
measuring cell sufficiently with zero gas.
2)
Turn OFF the power switch.
3)
After loosening the retaining screws on the sides of the top cover, lift off top cover
and locate the block cell.
4)
Disconnect the inlet and outlet tube from both measuring cells.
5)
Disconnect the wires from the two terminal screws of the infrared source unit and
unplug the 2-pin connector (No. 8 in figure 10-3) from the chopper motor.
6)
Disconnect the block cell’s detector output-cable-connector from the main circuit
board.
7)
Remove the two screws (No. 1 in figure 10-3) that secure the infrared source unit
to the base.
8)
Remove the sub-assembly consisting of the source unit, block cell, and detector.
9)
Remove the two screws (No. 19 in figure 10-3) that secure the detector to the
infrared source then separate the detector and block cell from the infrared source
unit.
10) While holding the detector in the palm of your hand, remove the two flat-head
screws (No. 18 in figure 10-3) which fix the cell to the detector.
Note: the cell window (No. 10 in figure 10-3) is loose and is only retained by the
clamping action between the detector and the block ample cell Take care not to drop the
window when separating the block cell from the detector.
11) Clean the cell interior and CaF
2
windows using a soft cloth or tissue (see Note on
previous page). Inspect the O-Ring for flatness or deterioration and replace if
necessary.
12) The block cell can be re-assembled by following the reverse of the disassembly
procedures. Note the orientation of the loose window and 0-ring during
disassembly.
Note: Before re-installing the infrared source unit, block cell and detector sub-assembly
you should first remove and clean the pipe cell.
13) Remove the pipe cell retaining screws (No. 7 in figure 10-3)
14) Remove the retaining clamps (No. 11 in figure 10-3).
15) Lift the pipe cell out of its two supports (No. 10. in figure 10-3) and remove both
windows (right-hand threaded) (No. 14 in figure 10-3).
16) At this time, inspect the O-Ring (No. 13 in Figure 10-3) for signs of deterioration.
Replace if necessary.
17) The
CaF
2
window is bonded to the window holder. Inspect and clean the
windows as necessary using cotton swabs and a suitable cleaning solution.
Summary of Contents for 600-NDIR
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