APG LPU-2428 user manual - Manual (Page 7)

Rev. A3, 11/08 LPU-2428
7
Automation Products Group, Inc.
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Installation
The LPU sensor should be mounted so that it has a clear sound path to the
level monitored. Mount the sensor away from tank walls and inlets. The path
should be free from obstructions and as open as possible for the 9° off axis
beam pattern. Follow the guidelines mentioned in "Understanding Ultrasonics".
When using a stand pipe to mount the sensor above the tank, the stand pipe
should be seamless and no longer than 4 inches to provide a smooth path for
the sound waves to propagate into the tank. Seams from couplers, nipples or
gaskets can cause erroneous echoes and degrade the sensors performance.
The LPU can be mounted in a coupler, or flange using the 2” NPT threaded case.
Caution: Do not over tighten! The sensor should be threaded in only hand
tight.
The minimum detection range of the LPU is approximately 1 ft. The sensor
should be mounted to ensure the target does not come closer than the
minimum range or erroneous readings may result.
DO NOT mount the sensor
where the beam will intersect
objects such as fill streams,
pipes, ladder rungs, wall seams,
or corrugated tank walls.