APG DCR-1006A user manual - Manual (Page 8)

DCR-1006A Ultrasonic Controller Rev. A1, 2/14
8
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Stand Pipe Mounting
Stand pipes are used to provide headroom at
the top of a tank when the target is expected
to come closer to the sensor than the
minimum blanking distance. It’s very critical
that the stand pipe be installed perpendicular
to the target. This is especially important
on longer range applications. The pipe must
have smooth walls (no joints) and no burs or
obstructions. If possible, cut the end of the
pipe at a 10°-45° angle (see drawing). Use
the largest diameter pipe and shortest length
possible. As a general rule, the diameter of
the pipe should be 1/2 the length. The pipe
ID must remain the same through it’s entire
length.
Stilling Pipe Mounting
Stilling pipes provide access to difficult areas
and help eliminate problems with foam.
The pipe must have smooth walls (no burs
or joints). Because the sound waves will
concentrate and propagate down the inside
walls of the tube, any irregularities on the
tube walls may produce echo returns and
cause false readings. Stilling pipes are limited
to liquid targets that will not leave heavy
deposits on the tube walls. Because the
sound waves are confined inside the pipe,
it is usually necessary to greatly reduce the
sensors sensitivity and pulses settings. A vent
hole must be provided at the top of the pipe.
Be sure to keep the vent hole inside of the
blanking area.
Cut at angle
when possible
Vent Hole