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5.3.3 Installing a New Pump
Tube
To install a new pump tube, follow the steps listed below:
1. The pump tube is marked with two black bands. These
bands are used to correctly locate the tubing in the detector
and pump. Correct placement is critical to prolonging the
life of the pump tube and to assuring efficient operation
and accurate sample volumes.
Facing the liquid detector, place 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 detec-
tor. Figure 5-3 above shows the correct placement of the
tubing at the liquid detector.
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 thumb-
screws.
4. Recheck the position of the marker bands and adjust the
tubing if the position of the tubing has slipped.
5. Replace the outer case of the liquid detector and tighten
the two thumbscrews.
Note
For proper operation of the liquid detector, it is important that
its lid is tightly attached to its base. Be sure to tighten the two
captive thumbscrews tightly.
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 coil spring.
8. Pull the tube through the coil spring, and carefully insert
the tube into the body of the distributor arm.
9. Feed the end of the tube into the outlet of the distributor
arm so that the end of the tube is flush to
the end of the arm.
10. Reinstall the suction line, as described in Attaching the
Suction Line in Section 2.
11. Reinstall the distributor arm on the distributor shaft and
screw in the distributor arm retaining nut. Be sure that
the retaining nut is tight.
12. Inspect the length of exposed tube under the center sec-
tion. 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 distribu-
tor arm. This prevents low spots in the tube which might
not completely drain of sample liquid. If there is excessive
slack, adjust the length of the tubing under the center sec-
tion by pulling tube out of the pump tube port.
13. Reset the pump tube count to zero. Refer to the discussion
of the Tubing Life configure option in Section 3.
3700 Portable Samplers
Section 5 Routine Maintenance
1
/
inch below
16
5-7
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