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3
Installation
The correct function of the device within the specific technical data can only be guaranteed, if
the permitted process and environmental temperatures (see chapter „Technical data") will not be
exceeded.
3 .1 Installation place
3 .1 .1 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, which 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: rx = tan (α / 2) * Lx
Example values for Lx and rx can be found in the chapter "Technical Data - Input".
ACS-CONTROL-SYSTEM GmbH l Lauterbachstr. 57 l D-84307 Eggenfelden l www.acs-controlsystem.de l info@acs-controlsystem.de
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