Dry Sample Delivery Connections; Figure 2-3 Typical Fluid Connections, Sdc Pictured - Microtrac S3500 Operation And Maintenance Manual

Refer to the appropriate recirculator manual for tubing connection details. The fluid path through the
S3500 sample cell is from bottom to top. The inlet fitting is on the bottom, the exit fitting on top. Large-
radius tubing elbows are provided to simplify the connections and ensure a smooth fluid path. Note that
the knurled nuts attaching the tubing elbows to the wet sample cell holder should be tightened hand-tight
only. See Figure 2-3 as an example of a typical installation.
Most installations use Teflon tubing. It is frequently helpful to bend the tubing to shape to fit in confined
areas. This can be achieved by simply heating the Teflon tubing with a heat gun while holding the tubing
in its desired shape until it cools sufficiently. Make sure the connecting tubes are long enough to prevent
kinking at the fittings. Always ensure that tube ends are cut straight and perpendicular to the tube, and that
they are fully inserted into their fittings. Improper connections at the fittings can cause crevices where
sample can accumulate. Refer to the recirculator manual for details.

2.4.2 Dry Sample Delivery Connections

Vacuum
All dry sample delivery systems use vacuum to remove sample. With the dry sample cell installed in the
analyzer, connect the vacuum tube elbow to the sample cell using the push-on fitting. The fitting swivels
full circle to allow the vacuum hose to approach from different directions as needed. Install the vacuum
hose from the Microtrac-supplied vacuum system or a user-provided system by pushing it onto the vacuum
tube elbow. See Figure 2-4.
The vacuum hose typically attaches to a canister-type industrial vacuum. Control of the vacuum is
achieved by inserting the plug into the dry sample delivery controller included with your system.
Alternatively, a centralized vacuum source may be used if it meets the requirements listed in section 1.4.
Control of the vacuum would then be through an electric valve plugged into the controller in place of the
canister vacuum.
12 Microtrac S3500 Particle Size Analyzer Operation and Maintenance
Figure 2-3
Typical Fluid Connections,
SDC Pictured
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