MJK Automation Shuttle Ultrasonic Level Transmitter and Sensor - Manual (Page 44)

44 GB Shuttle Manual 100316 SW 838023
Appendix
Measurements
Along a wall / other surface
The values in table 1 assume the ultrasonic
signal is sent along a smooth surface like
a wall or plane without any projections,
joints, butts etc.
If the surface is not smooth or has projec-
tions (i.e. joints on prefab elements), the
ultrasonic signal will be impedeaded too
much, and for that reason
the values for minimum distance to wall in
table 1 should be increased with
50 - 100 % !
Through a concrete deck
When the ultrasonic sensor is measuring
through a concrete deck, the dimension
of the opening should be made as shown
below: (See table 1 for the sensor spread.) In a tank / container
If the ultrasonic sensor is mounted for
measurement of the level in a closed tank or
container, it should measure through a pipe
with a cutoff as shown below:
Through pipe for foam protection
When measuring on liquids prone to building
up foam on the surface, it is often necessary
to measure through a pipe, since the build
up of foam rarely will occur inside the pipe.
Measurement through a concrete deck with
45 - 60 ° edge cutoff.
Measurement through a concrete deck with
sharp edge.
30 - 45 °
Min. diameter (D) =
sensor spread + 100 %
Measurement through a pipe for foam protection.
Min. diameter (D)
= sensor spread +
100 %
Min. diameter (D) =
sensor spread
+ 50 %
Measurement in a closed container or tank.
Min. 14 in
Min. diameter (D) =
sensor spread + 100 %