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

Prices starting at:
Call for Availability

Loop-powered ultrasonic transmitter for liquid level measurements in open channels, storage vessels and simple process vessels up to 40 feet (12 meters). 10° beam angle. ETFE or PVDF copolymer transducer for chemical resistance in a variety of applications. Good for process temperatures to 185°F (85°C). Available in general purpose or intrinsically safe models.

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, and the Paducah, KY area. 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

Supported by

Siemens Advantage Plus

Model Selection Guide

Use this table to find the right model for your application. Don't see the option you need? Call a Lesman sales specialist at 800-953-7626.

Make one choice from each table section. A complete catalog number will look like this: 7ML5221-_ _ _ _ _

Description Catalog
SITRANS Probe LU: Ultrasonic Level Transmitter 7ML5221-
Range 20 Ft (6 M) ETFE Wetted Parts
20 Ft (6 M) PVDF Copolymer Wetted Parts
40 Ft (12 M) ETFE Wetted Parts
40 Ft (12 M) PVDF Copolymer Wetted Parts
2A_ _ _
2B_ _ _
2C_ _ _
2D_ _ _
HART® and 4-20 mA Output
Profibus PA
_ _A1_
_ _A2_
Approvals General Purpose FM, CSA, CE
FM Class I, Div 2
Intrinsically Safe (HART®) FM/CSA
Intrinsically Safe (Profibus) FM/CSA
_ _ _ _1
_ _ _ _4
_ _ _ _8
_ _ _ _5
Accessories Intrinsically Safe Handheld Programmer 7MK5830-2AH
2" NPT Universal Mounting Adapter for 3" Flange 7ML1830-1BT
SITRANS Probe LU Instruction Manual A5E32337695
SITRANS Probe LU Quick Start Guide A5E32168031
USB HART® Modem for PC and SIMATIC PDM 7MF4997-1DB
SIMATIC PDM v8.1 Software for Configuring, Commissioning and Diagnostics; (Profibus, HART®, 4 Tags) TGX:PDM-3AB28-0YA5
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

To build your complete part number, make a selection from each table section below. Your completed model and its price will appear in the Results section. If you don't see the options you need, call us.


          Please complete your model selections.
          Write Your Own Review
          You're reviewing:Siemens SITRANS Probe LU Loop-Powered Long Range Ultrasonic Level Transmitter
          Your Rating
          Copyright 1995-2021 © Lesman Instrument Company