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SITRANS Probe LU is a 2-wire loop powered ultrasonic transmitter for level, volume and flow monitoring of liquids in open channels, storage vessels and simple process vessels.

The SITRANS Probe LU is ideal for level monitoring in the water and wastewater industry and chemical storage vessels.

The range of SITRANS Probe LU is 6 or 12 m (20 or 40 ft). Using Auto False-Echo Suppression for fixed obstruction avoidance, as well as an improved signal-to-noise ratio and improved accuracy of 0.15% of range or 6 mm (0.25″), the Probe LU provides unmatched reliability.

SITRANS Probe LU includes Sonic Intelligence® signal processing from the field-proven Probe and incorporates new echo processing features and the latest micro-processor and communications technology. The Probe LU offers two communications options: HART or PROFIBUS PA (Profile version 3.0, Class B).

The transducer on the Probe LU is available as ETFE or PVDF to suit the chemical conditions of your application. As well, for applications with varying material and process temperatures, the Probe LU incorporates an internal temperature sensor to compensate for temperature changes.

Key Applications

chemical storage vessels, filter beds, liquid storage vessels.

Supplementary Components are designed to work with most types of instrumentation to provide enhanced functionality such as remote displays and remote monitoring solutions. Please find more information here.

Don’t forget that the safest engineered level measurement solution includes switches for back-up, overfill, low level and dry run protection.


Range  0.25 to 12 m (0.8 to 39 ft)
 Process temperature  -40 to 85 °C (-40 to 185 °F)
 Output -4 to 20 mA/HART


– Intrinsically Safe (optional)

Continuous level measurement up to 12 m (40 ft) range

Easy installation and simple start-up

Programming using infrared Intrinsically Safe handheld programmer, SIMATIC PDM or HART® Communicator

Communication using HART or PROFIBUS PA

ETFE or PVDF transducers for chemical compatibility

Patented Sonic Intelligence signal processing

Extremely high signal-to-noise ratio

Auto False-Echo Suppression for fixed obstruction avoidance

Level to volume or level to flow conversion