Hach 54400-18, Инструкция по эксплуатации инструмента

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Section 1
Page 17
54400_install.fm
Sample Conditioning
1.6.1 Assembling the Sample Conditioning Kit
Refer to the tips below and to the complete system diagram in Figure 6 to
assemble the components.
• Seal all threaded fittings with two wraps of Teflon
®
tape (provided).
• Two stops should be felt when installing tubing into the push-in fitting. The
first is when the tubing clears the gripper ring, and the second is when the
tubing bottoms out in the fitting. Improperly installed tubing will leak; take
care to push the tubing all the way in.
Note: To help grip the tubing, use
rubber gloves or other material that
grips and forcefully push the tubing
into the fitting. Two stops should be
felt; otherwise the tubing will not be
fully inserted and will leak.
• Be sure to cut all tubing used in the push-in fittings with a sharp knife so
the ends are round, cleanly cut and not angled.
• The push-in fittings are designed for use with soft, ¼-inch OD plastic
tubing as included in the kit. Tubing material such as PTFE or HDPE is
recommended. The push-in fitting will not grip hard plastic or metal tubing
and the tubing will slip out.
1.6.2 Using the Sample Conditioning Kit
Assemble the head height regulator (stand-pipe) and filter as shown in
Figure 6 . Make sure the sample pressure to the sample conditioning is
between 1.5 and 75-psig for proper operation.
1. Set flow by adjusting the ball valve (item 18, in Figure 6 ). The valve is fully
closed when the lever is perpendicular to the valve body and fully open
when the lever is parallel with the valve body.
2. Observe the flow in the unfiltered sample bypass (clear tube, item 13 in
Figure 6 ). Make sure the flow is adjusted so there is always bypass flow.
3. Use the ball valve (item 19) to turn off sample flow to the instrument.