Siemens SITRANS Probe LU Loop-Powered Long Range Ultrasonic Level Transmitter

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Loop-powered ultrasonic transmitter for liquid level measurements in open channels, storage vessels and simple process vessels up to 40 feet (12 meters).

This product has been discontinued by the manufacturer. Please see Siemens SITRANS Probe LU240 for a suitable replacement.

Territory Restriction: Due to our territory agreement with Siemens, Lesman is the authorized Siemens sales representative in Illinois, Indiana, Wisconsin, Eastern Missouri, Michigan's Upper Peninsula, Paducah KY area, Oregon, Washington, Northern Idaho, Western Montana, Alaska, and Hawaii. If you are outside that area, you can find your local sales office or get technical assistance by calling 800-365-8766 or 972-522-4500, or sending an email to

Siemens SITRANS Probe LU is a two-wire, loop-powered integrated ultrasonic level transmitter that includes automatic false-echo suppression, Milltronics' patented Sonic Intelligence echo processing, with digital communications and programming options in a single unit. The Probe LU is ideal for level monitoring in the water and wastewater industry and chemical storage vessels, and can reliably monitor level, volume, and flow of liquids in open channels, storage vessels, and process vessels.

The transducer on the Probe LU is available as ETFE or PVDF to suit the chemical conditions of your application. To compensate for temperature changes in applications with varying material and process temperatures, the Probe LU incorporates an internal temperature sensor. It comes with two communications options: HART® with 4-20 mA output or PROFIBUS PA (Profile v3.0, Class B).

  • Continuous Liquid Level Measurement at 20- or 40-Foot (6 or 12 Meter) Range
  • ETFE or PVDF Wetted Parts for Chemical Compatibility
  • Patented Self-Learning Algorithm Ignores False Echoes from Fixed Obstructions
  • Programming using Intrinsically Safe Infrared Handheld Programmer, SIMATIC PDM, or HART communicator
  • Short 10-Inch (0.25m) Blanking Distance, Even at Long Ranges
  • Performs Level-to-Volume or Level-to-Flow Conversions
  • CSA, FM, CE Approvals Standard; ATEX, CSA, FM Intrinsically Safe, Non-Incendive Approvals Optional

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Siemens Advantage Plus


Need technical help?
Visit the Siemens USA Support center.

More Information
Point or Continuous Level Continuous
Level Media Liquid
Level Technology Ultrasonic
Measuring Range 10 Inches to 40 Feet (0.25 to 12 Meters)
Wetted Materials ETFE or PVDF copolymer transducer, Buna-N seal
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