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Ultrasonic Level Controller

The Siemens SITRANS LUT400 series controllers are compact, single-point, long-range ultrasonic controllers for a continuous level or volume measurement of liquids, slurries and solids, and high-accuracy monitoring of open channel flow.

The SITRANS LUT400 ultrasonic level controller comes in three different models, depending on the application, level of performance and functionality:  SITRANS LUT420 Level Controller, SITRANS LUT430 Level, SITRANS LUT440 High Accuracy OCM.


  • Small 1/2 DIN enclosure [144 h x 144 d x 146 w mm (5.7 x 5.7 x 5.75 inch)] with standard universal mounting bracket for wall, pipe, and DIN rail, plus an optional panel mount
  • Easy to use LUI display with local four-button programming, menu-driven parameters, and Wizard support for key applications
  • Level, Volume, OCM Flow monitoring
  • Three relays combined with a suite of pump, alarm, and relay control features
  • HART Communications
  • EDDs for SIMATIC PDM, AMS Device Manager, and Field Communicator 375/475, plus DTMs for FDTs (Field Device Tools)
  • Web browser for local programming from an intuitive web-based interface
  • Two discrete inputs for backup level override and pump interlock functions
  • Echo profile and trend views from the local display
  • Patented digital receiver for improved performance in electrically noisy applications (close proximity to VSDs)
  • Real time clock with daylight savings time, supporting an integrated datalogger and energy saving algorithms for minimizing pump operation during high cost energy periods
  • Removable terminal blocks for ease of wiring

Additional Info


0.3 … 60 m (1 … 196 ft), transducer dependent
Compatible transducers
All EchoMax and ST-H series transducers
– Standard operation: ± 1 mm (0.04 inch) plus 0.17 % of measured distance
– High accuracy OCM: ± 1 mm (0.04 inch), within 3 m (9.84 ft) range

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