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18
MN300610 Rev C3
Installation
Step Seven
Stand Pipe:
A standpipe maybe used to dampen turbulence or when foam is present in the application.
a. Pipe can be made of any material.
b. Minimum ID for the stand pipe is listed below.
i. A 2” pipe (min. pipe ID) is usable with the LU27
series.
ii. A 3” pipe (min. pipe ID) is usable with the LU23,
LU28 & LU29 series.
iii. Pipes larger than 3” can also be used.
c. Use a coupling and reducer bushing to attach the
EchoSonic
®
to the pipe.
i. With the LU27 series, be sure to use a plastic
reducing bushing such as LM52-1400 2” T x 1” T
fitting or the LM52-1410 2” S x 1” T fitting.
ii. For the LU27 series, be sure to use a plastic
reducing bushing such as LM52-1400 (2”T x 1”T)
fitting or the LM52-1410 (2”S x 1”T) fitting.
iii. For the LU23, LU28 & LU29 series, use a reducer
bushing such as LM52-2400 (3”T x 2”T) fitting or
the LM52-2410 (3”S x 2”T) fitting.
d. The pipe length should run the measurement span and
the bottom of the pipe should remain submerged at all
times to prevent foam from entering the pipe.
e. Cut a 45°notch at the bottom of the pipe and drill a
1/4”pressure equalization hole in the dead band.
f. The pumps should not drive liquid past the open end of
the stand pipe which causes the liquid in the pipe to
oscillate.
EchoSonic
®
LU27
2” x 1”
Reducer Bushing
(TxT)
2” Coupling
(S x T)
Vent Hole (1/4”)
2” PVC Pipe
LU27 attached to a LM52-1400
(2”x1” reducer bushing) to a S x T
2” coupling.
Avoid the use of a tee within the
stand pipe. A tee can create false
signals which will interfere with the
sensor’s performance.
