Hach SIGMA 900, Руководство пользователя

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Page 28
Pump Tubing Maintenance
8837mnt.fm
Section 4
4.2.1 Tubing Life Estimates
Pump tubing life depends on several factors:
• Distance from sample source. Locate the sampler as close to the sample
source as possible.
• Vertical lift. Minimize the vertical lift (ideally, 15 feet or less).
• Intake Rinses. Minimize the number of intake rinses prior to sample
collection.
• Pump roller assembly condition. Remove (clean) the silicone residue in
the interior of the pump housing and on the rollers before installing a
new tube.
• Constituents in the sample liquid. Grit and other abrasive solids
cause greater wear on the tubing as they are squeezed through the
pump rollers.
Note: To extend the life of the
tubing, rotate the pump tube 90
degrees in the pump housing after
approximately
2
/3 of the life has
been realized (once the tube life has
been determined through use).
Experience at a particular site will be your best indicator of tubing life. Visually
inspect the tubing and rollers on a regular basis after initial installation to get a
feel for what maintenance your site will require. Be sure to replace the pump
tubing before it splits to prolong the life of the sampler and keep the work area
free of contamination from the sample liquid.
Always use the proper length of silicone tubing in the pump body. An improper
length can reduce the life of the tubing and pump rollers. Total tube length is
33 inches (84 cm). Refer to
Figure 9 for the correct length.
Figure 9 Pump Tube Loading