Appendix C. EC155 Sample Cell and Intake Maintenance
C-4
5.
Repeat this procedure as needed.
When the windows no longer become dirty (CO
2
and H
2
O signal levels do not
change) this indicates no more dust is being removed from the intake tube.
C.2.3 Solvent Flush
If the intake tube has other contamination, such as salt deposits, it may be
flushed with water or alcohol. For the newer design vortex intake, once it is
detached, a syringe filled with solvent can flush solvent through the intake
sample tubing. Once it has been adequately flushed, fill the syringe with air to
push any remaining solvent droplets out of the intake.
This procedure is likely to leave some of the solvent in the system.
Make sure it is completely dry before attempting a zero/span.
For sample cells of the older design (serial numbers less than 2000), since the
intake cannot be detached, care must be exercised to keep the solvent out of the
pressure sensor passages (see earlier note on cleaning the sample cell).
Following the next steps will help keep the pressure sensor passages clear.
1.
Power the system down.
2.
Remove the sensor head from the sample cell.
3.
Close the lid of the sample cell assembly.
4.
Position sample cell assembly upside down. This allows the solvent to
flow away from the pressure sensor passage.
5.
Tilt slightly so that the intake is higher than the sample cell.
6.
Remove the intake filter.
7.
Fill a syringe with solvent (generally, tap water will be sufficient) and
press it against the hole in the end of the intake tube.
8.
Depress the plunger to let the solvent flow through the intake tube. The
waste solvent will collect in the lid of the sample cell assembly.
9.
Fill the syringe with air and push the air through the intake tube to force
most of the solvent out of the tube.
10.
Dump the solvent out of the sample cell assembly and wipe the assembly
dry.
11.
Clean the analyzer windows and the sample cell as described in Section
, and
, in the section above.
This procedure is likely to leave some of the solvent in the system.
Make sure it is completely dry before attempting a zero/span.
NOTE
NOTE
Содержание EC155
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