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3 .2 Installation notes
• Drive the system pressure free prior installation resp. deinstallation of the sensor.
• The screw-in of the thread process connection by using the terminal enclosure, the connection plug
resp. the connection cable is not permitted.
• The tightening of the thread process connection may only be done at the hexagon by a suitable
spanner and with the maximum permitted torque strength (see chapter „Technical data").
• The housing can be rotated every time, also at operation, mechanically by 300°.
• The display can be rotated every time electrically by 180°.
3 .2 .1 Pressure / vacuum
Gauge pressure in the vessel does not influence the measuring result. Low pressure or vacuum does,
however, damp the ultrasonic pulses. This influences the measuring result, particularly if the level is
very low (≤ -0,2bar resp. -20kPa).
3 .2 .2 Vapor pressure
The vapor pressure at 20°C (68°F) gives a hint on the accuracy of the ultrasonic level measurement.
If the vapor pressure at 20°C (68°F) is below 50mbar, ultrasonic level measurement is possible with a
very high accuracy.
This is valid for water, aqueous solutions, water-solid-solutions, dilute acids (e.g. hydrochloric acid,
sulfuric acid), dilute bases (e.g. caustic soda), oils, greases, slurries, pastes, etc.
High vapor pressures or outgassing media (e.g. ethanol, acetone, ammoniac) can influence the
accuracy.
3 .2 .3 Range
The sensor range is dependent on the measuring conditions.
The maximum range can be found in the chapter "Technical Data - Input".
3 .2 .4 Blocking distance
If the blocking distance is undershot, it may cause device malfunction.
• Install the device at a height so that the blocking distance BD (see chapter "Technical Data -
Input") is not undershot, even at maximum fill level Hmax.
• If the medium reaches the transducer, buildup can form on it and cause faulty measurements later
on.
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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