Appendix C. EC155 Sample Cell and Intake Maintenance
C-3
After servicing the intake, it should be reattached following the steps above in
reverse order.
When reattaching the intake, insert the stainless steel tube back through the
small black nut and into the sample cell by pushing directly on the black
Santoprene end piece. Push until the end of the stainless steel tubing hits
against the sample cell and about 8 mm (0.31 in) of the stainless steel tubing is
exposed between the black nut and the black grommet inside the white intake
tube. Once fully seated, the end of the large white tube should be within 2 mm
of being flush with the edge of the mounting plate. As a final check to ensure
the tube has been inserted and sealed properly, the user may direct his or her
breath through and small tube directed as the tube insertion point while the
analyzer is making measurements. If no CO
2
peak is observed, there is no leak.
When reattaching the intake, if the stainless steel tubing is
not fully seated against the sample cell, a leak could be
introduced.
C.2.2 Dust Blowout
For a vortex intake tube that remains dusty even after performing the air blast
procedure described in step 5 of Section
(p. 37)
, it is recommended to detach the intake as described
in the section above and then use compressed air to blow out the intake sample
tubing.
For older sample cells (serial numbers less than 2000), if the intake tube is
dusty, the cleaning procedure is similar to the air blast procedure for the vortex
intake and is described in detail in the steps below.
For the older design sample cell, do not blow the dust out of
the intake assembly using compressed gas as this may
damage the differential pressure sensor in the sample cell
assembly. The maximum pressure allowed on the pressure
sensor is 75 kPa (differential).
1.
Run the system normally, with the analyzer in place and the pump on.
2.
Remove the filter at the inlet of the intake.
3.
Plug the hole in the inlet with your finger. The pump will pull a vacuum
on its internal filter/buffer volume, the pump tube, analyzer, and intake
tube.
4.
After approximately one minute, unplug the hole.
During these steps, ambient air will rush in and blow dust from
the inner walls of the intake tube, which is likely be deposited on
the analyzer windows. For this reason, Campbell Scientific
recommends performing the dust blowout prior to cleaning
windows.
CAUTION
CAUTION
NOTE
Содержание EC155
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