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Plumbing
Install the bubbler line tubing
Note: The bubbler line tubing and the air dryer cartridges on the right side of the instrument are only used for depth
measurement unless the optional bubbler area/velocity sensor is connected to the Velocity port on the instrument.
1. Push 3.17 mm (1/8-in.) ID vinyl tubing over the Bubbler line port on the instrument. No clamps are
necessary.
2. Put the other end of the bubbler line tubing at the correct head measurement point for that
primary device. All weirs and flumes come with or can be retrofitted with a connection for the
bubbler line tubing.
If a bubbler area/velocity sensor is not connected to the Velocity port on the instrument, put the
other end of the tubing in the flow stream instead.
Note: Stainless steel bubbler tubing line extensions are available. Optional mounting bands with built-in bubbler
line tube connections for use in round channels are available.
• Make sure that the bubbler line tubing is lower than the instrument so that condensation in the
tubing drains out. Moisture in the bubbler line tubing slow the flow of air and cause incorrect
readings.
• Use the shortest length of bubbler line tubing possible to decrease moisture problems and
kinks.
• Use a single continuous length of tubing for the bubbler line tubing with no connections so
there are no air leaks.
• Put the end of the bubbler line tubing perpendicular (at a right angle) to the flow stream.
• Make sure that the open end of the bubbler line tubing is 2.5–5 cm (1–2 in.) below the lowest
expected level in the channel. Push LEVEL ADJUST to calibrate the reading shown to the
actual level in the channel.
• In a weir or flume, use a stilling well. Silt and sediment collection in a stilling well is not typical.
• In round pipes, use the mounting bands from the manufacturer or put the bubbler line tubing
along the wall in a slot or groove and cover it so it does not stick out into the flow stream and
collect unwanted material.
3. If the instrument is in a location where it can be temporary under water:
a. Attach a length of ¼-in. ID tubing to both the Reference port and the Intake port barbed
fittings.
b. Put the ends of the reference port tubing and intake port tubing in a location that is always
above water.
c. Attach both air dryer cartridges to the tubing. Make sure that the air dryer cartridge openings
(end caps) are down so that moisture, condensation and/or precipitation does not collect in
the vent openings of the air dryer cartridge. If the air dryer cartridge openings are up, damage
to the air pump and internal plumbing systems can occur.
Optional: Enable the auto-purge feature to remove unwanted material from the bubbler tube. When
enabled, a 1-second high pressure air purge occurs at the end of the selected time interval. From the
Main Menu, select OPTIONS>ADVANCED OPTIONS>CALIBRATION>BUBBLER>AUTO PURGE.
User interface
Refer to
Figure 7
for the front panel features. Refer to
18 English
Table 14
for display and key descriptions.
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