700-Bubbler-Man Rev 12 13 Feb 2020
Page 6/51
INSTALLATION
2.1 PRIOR TO PROCEEDING TO THE SITE
2.1.1 EQUIPMENT
Unpack the Bubbler and conduct a visual inspection for any signs of shipping damage. If any
damage is found, contact FTS Service and Support immediately. Retain the shipping container to
transport the Bubbler to the site or to return the unit to FTS should damage have occurred during
shipping.
For mounting the air dryer
• 3/32” flathead screwdriver (for the terminal block
screws)
• 11/16 open-ended wrench
• 5/8 open-ended wrench
• Teflon tape
• Additional tools and hardware for mounting the Bubbler
in accordance with your site characteristics.
• Drill with bits
• 9/16 open-ended wrench
• Flathead screwdriver
• Teflon tape
2.2 SITE SELECTION
The Bubbler should be mounted adjacent to the body of water to be measured, typically in a
hydrology shack or gauging house. The position of the Bubbler should allow for a continuous
downward run of the orifice line to its final termination point. The water should be relatively calm
and where sediment accumulations are not likely to block the orifice.
The orifice line with a terminating orifice should be laid out into the water so that the stream ward
end will remain in a fixed position and at a depth that will not be exposed at low stage. Should the
orifice line need to be installed in an area with high currents, it should be installed in a static tube.
2
2.3 MOUNTING
When mounting the Bubbler these guidelines should be followed:
• The Bubbler should be firmly bolted to a flat/even vertical surface using all four mounting
plates located on the corners of the enclosure.
• Screws for the mounting plates should be tightened until the play is gone but not to the
point that the screw is forming any kind of indentation or depression in the mounting plate.
Overtightening can cause the mounting plates to fail over time. The connectors and outlets
should be pointing down.
• The Bubbler must have a dedicated desiccator and air intake path; do not use one desiccator
for multiple Bubblers (this can cause spikes in the data). Additionally, the entire air intake
path from the desiccator’s air intake line to the Bubbler’s air intake fitting should have no
restrictions (e.g. check valves) as this can cause spikes in the data;
2
Refer to USGS publications TM3-A7 Stage Measurement at Gaging Stations http://pubs.usgs.gov/tm/tm3-
a7/pdf/tm3-a7.pdf and TWRI_8-A2 “Installation and Service Manual for U.S. Geological Survey Meters”
http://pubs.usgs.gov/twri/twri8a2/html/pdf.html
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