ACS-CONTROL-SYSTEM GmbH
l Lauterbachstr. 57 l D-84307 Eggenfelden l www.acs-controlsystem.de l [email protected]
8
Installation place
Level measurement
•
Do not install the sensor in the middle of the tank (C). We recommend leaving a distance
between the sensor and the tank wall (A) measuring 1/6 of the tank diameter. In vessels with
conical bottom it can be advantageous to mount the sensor in the center of the vessel, as
measurement is then possible down to the lowest point of the vessel bottom.
•
Use a protective cover, in order to protect the device from direct sun or rain (B).
•
Avoid measurements through the filling curtain (D). Through the action of filling, stirring and
other processes in the vessel, dense foams which considerably damp the emitted signals may
form on the product surface. If foams are causing measurement errors, the sensor should be
used in a standpipe.
•
If there are strong air currents in the vessel, e.g. due to strong winds in outdoor installations
or air turbulence, e.g. by cyclone extraction, the device should be mount in a standpipe.
•
Make sure that equipment (E) such as limit switches, temperature sensors, etc. are not
located within the emitting angle
α
. In particular, symmetrical equipment (F) such as heating
coils, baffles etc. can influence measurement. If large vessel installations such as struts or
supports cause false echoes, these can be attenuated through supplementary measures.
Small, inclined sheet metal or plastic baffles above the installations scatter the ultrasonic
signals and avoid direct false echoes.
•
Align the sensor so that it is vertical to the product surface (G).
•
Never install two ultrasonic measuring devices in a tank, as the two signals may affect each
other.
•
To estimate the detection range, use the 3 dB emitting angle
α
, that can be found in the
chapter „Technical Data - Input“. This radius of the detection range at an arbitrary distance Lx
can be calculated by the following term: r
x
= tan (
α
/ 2) * L
x
Example values for L
x
and r
x
can be found in the chapter “Technical Data - Input”.
Summary of Contents for Sonicont USN020
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