107
Maintenance
•
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.
The proper length of silicone tubing must be used in the pump body. An improper length
can reduce the life of the tubing and pump rollers. For the correct length, refer to
9.4.2 Replacing pump tubing
1.
To replace the pump tube, remove the four screws on the pump cover.
2.
Remove the front cover of the pump housing.
3.
Remove the existing tubing. Locate the black dot on the new tubing. The end of the
tube that extends farthest beyond the black dot is routed through the strain relief and
attaches to the stainless steel tubing connector.
4.
Install the pump tube in the pump housing until the black dots are visible just outside
the pump body.
5.
After inserting the new pump tube, reinstall the front cover and secure it with the four
screws until finger tight.
Figure 35 Pump tube loading
1
To S-shaped strain relief
4
146.1 mm (5 ¾ in.)
2
Alignment dots
5
To sample fitting
3
295.3 (11
5
/
8
in.) tubing in pump
Goodnal STP ST041 Pre Treatment (Sigma 900 MAX All Weather Refrigerated Sampler) Vendor Manual
Q-Pulse Id VM373
Active 29/10/2013
Page 107 of 122
