Download 3710 Portable Samplers

3710 Portable Samplers
Section 5 Routine Maintenance
5.4.3 Installing a New Pump
Tube
The steps below outline the procedure needed to install a new
pump tube.
WARNING
Pump may actuate without warning. To avoid injury,
sampler must be off when pump housing cover is removed
for inspection or tubing replacement.
1. The pump tube is marked with two black bands which
locate the tubing correctly in the detector and pump. To
prolong the tubing life, insure efficient pump operation,
and accurate samples, place the tubing in the pump correctly.
Facing the liquid detector, position the inner edge of the
end band against the upper left inlet of the liquid detector.
Place the inner band at the lower outlet of the liquid detector. Figure 5-3 shows the correct placement of the tubing.
2. Slip the pump tubing under the rollers so that the pump
tubing does not interfere with the installation of the outer
pump lid.
3. Replace the outer pump lid and tighten the four thumbscrews.
4. Re-check the position of the marker bands and adjust the
tubing if the position of the bands indicate the tubing has
slipped.
5. Replace the outer case of the liquid detector. For proper
operation of the liquid detector, tighten the thumbscrews
securely.
6. Feed the free end of the tube down through the pump tube
port in the center section.
7. Turn the center section over again, and feed the end of the
tube into the pump tube guide in the float cage as shown in
Figure 5-1. The discharge end of the tube should be flush to
1
/16-inch below the end of the guide.
8. Re-install the suction line, as described in Section 5.5.
9. Inspect the length of exposed tube under the center section. There should be no excessive slack in this tube; it
should continuously slope downward from the bottom of
the center section to the point where it enters the float
cage. This prevents low spots in the tube which might not
completely drain. If there is excessive slack, adjust the
tube under the center section by pulling it from the
pump-tube port.
10. Reset the Pump Tube count to zero. Refer to the discussion
of Section 3.9.17, on page 3-36.
5-7