APG LPU-2127 user manual - Manual (Page 7)

Rev. A5, 1/14 LPU-2127
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", earlier in this manual. 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.
See the Hazardous Mounting section of this manual before mounting the
LPU sensor in a hazardous area.
DO NOT mount the sensor
where the beam will intersect
objects such as fill streams,
pipes, ladder rungs, wall seams,
or corrugated tank walls.