Campbell Scientific CS470/CS471 Compact Bubbler System - Manual (Page 21)

CS470/CS471 Compact Bubbler System
FIGURE 7-3. Connection of the Bubble Tube
7. Install the NPT adapter on the end of the elbow or tee joint.
8. Activate the CS470/CS471 while immersing the bubble chamber. The
CS470/CS471 needs to be activated, so that the piston pump is operating
during this procedure.
9. Insert the tubing as far as possible into the bubble chamber’s tube fitting
10. Rotate the nut until finger tight.
11. While holding the bubble chamber steady, tighten the nut with a wrench
about one and one-quarter turns.
12. Install the bubble chamber on the NPT adapter.
For optimal measurement results, the bubble chamber must be
adjusted to be horizontal and aligned in the direction of flow
(maximum tolerance ±5°). The 25502 bubble chamber has a ball-
and-socket joint which allows for adjustments by 15° in any
direction.
7.6 Purging Function
On the front of the CS470/CS471, there is a pump membrane button (see
FIGURE 7-4). Pressing the button activates the purge function for as long as it
is pressed. The Status LED lights for approximately 2 seconds. With an
activated purge function, the sensor pumps a large amount of air through the
NOTE
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