Technical information

Ultrasonic Level Sensor LUC-M**
Output
DOCT-0805F 01/2010 185414
6
Example (for LUC-M30)
For typical solid applications, a certain amount of dust coverage is normally present. Therefore, the
following range results from the table and the diagram.
These measuring conditions have been taken into account during the calculation of the maximum
measuring range in solid applications.
Operating frequency
Output
Output signal according to the instrument version ordered:
• 4 mA … 20 mA with HART protocol
• PROFIBUS PA
Signal on alarm Error information can be accessed via the following interfaces:
• on-site display (error symbol, error code and plain text description)
• current output (configurable)
• digital interface
Load HART Minimum load for HART communication: 250
Ω
Output damping freely selectable, 0 s ... 255 s
Linearisation The linearisation function of the LUC-M** allows conversion of the measured value into any unit of
length or volume. In open channels or measuring weirs, also a flow linearisation is possible
(calculation of the flow from the measured level). The linearisation table for calculating the volume
in an horizontal cylindrical tank is preprogrammed. You can also enter any number of other tables
containing up to 32 value pairs either manually or semi-automatically (by filling the vessel under
controlled conditions).
• Dust-covered rubble approx. 50 dB
• No dust development 0 dB
• No filling curtain in
detection range
0 dB
• Temperature difference < 20 K 0 dB
approx. 50 dB  range approx. 7 m (23 ft)
Sensor Operating frequency
LUC-M10 approx. 70 kHz
LUC-M20 approx. 50 kHz
LUC-M30 approx. 35 kHz
LUC-M40 approx. 42 kHz