SITRANS Probe LR is a 2-wire, 6 GHz pulse radar level transmitter for continuous monitoring of liquids and slurries in storage vessels with nominal pressure and temperature, to a range of 20 m (66 ft).

The Probe LR is ideal for applications with chemical vapours, temperature gradients, vacuum or pressure, such as tank farms, chemical storage, digesters and long-range applications. SITRANS Probe LR has a range of 0.3 to 20 m (1 to 65 ft).

Probe LR is designed for safe and simple programming using the Intrinsically Safe handheld programmer without having to open the instrument’s lid. It has a standard Uni-Construction polypropylene rod antenna that offers excellent chemical resistance and is hermetically sealed. The Uni-Construction antenna includes an internal, integrated shield that eliminates vessel nozzle interference. SITRANS Probe LR incorporates Process Intelligence ® signal processing. The Probe LR also has a high signal- to-noise ratio leading to improved reliability.

Key Applications: tank farms, chemical storage, wastewater wet well

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.




Pulse radar

Measurement Range

20m (66 ft)

Process Temperature

-40 to 80 °C (-40 to 176 °F)

Process Pressure

Up to 3 bar g (43.5 psi g)


  • Uni-Construction polypropylene rod antenna standard

  • Easy installation and simple startup

  • Programming using infrared intrinsically safe handheld programmer, SIMATIC PDM or HART® handheld communicator

  • Communication using HART®

  • Patented Sonic Intelligence® signal processing

  • Extremely high signal-to-noise ratio

  • Auto False-Echo Suppression of false echoes