Campbell Scientific EC155 CO2 and H2O Closed-Path Gas Analyzer and EC100 Electronics with Optional CSAT3A 3D Sonic Anemometer - Manual (Page 61)

Appendix C. EC155 Sample Cell and
Intake Maintenance
The following steps can be undertaken when the sample cell and intake tube
becomes dirty, or as part of routine maintenance of the EC155. Refer to
Section 9.3, Cleaning Analyzer Windows, for figures and instructions for
accessing and removing the analyzer from the sample cell.
C.1 Cleaning Sample Cell
1. Turn off the pump.
2. Power down the analyzer.
3. Remove the analyzer from the sample cell.
4. Use water or alcohol on a soft cotton swab to clean the inside of the
sample cell.
Take care not to let the water or alcohol drip down into the holes
at ends of the sample cell. Each end has a small passage that
connects to the pressure sensor. These passages can become
plugged by residue carried by the water or alcohol. This problem
can be avoided by using cotton swabs that are slightly moist, not
saturated. However, if more aggressive cleaning is needed, invert
the sample-cell assembly during cleaning so any liquid drains
away from these passages.
C.2 Cleaning Intake Tube
The EC155 intake tube is not designed to be removed by the user. If it
becomes dirty, it may be cleaned while attached to the sample cell assembly.
The appropriate cleaning procedure depends on whether the contamination is
particulate matter that has collected during dry, dusty conditions, or if it is an
accumulation of soluble material such as salt deposits. Guidance for cleaning
either type of contamination is found in the following sections.
C.2.1 Dust Blowout
If the intake tube is dusty, the procedure can easily be performed in the field.
Campbell Scientific recommends that the procedure is performed any time the
windows are cleaned.
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 75kPa
(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.
NOTE
CAUTION
C-1