SIEMENS SITRANS LR250 Horn Antenna Radar Level Transmitter


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Siemens SITRANS LR250: A cutting-edge 2-wire, 25 GHz pulse radar level transmitter engineered for continuous monitoring of liquids and slurries in storage and process vessels, even under extreme conditions of high temperature and pressure, covering a range of up to 20 meters (66 feet).


Featuring a graphical local user interface (LUI), the LR250 enhances setup and operation with an intuitive Quick Start Wizard and echo profile displays for diagnostic support. Startup is simplified with the Quick Start wizard, requiring only a few parameters for basic operation.

With its 25 GHz frequency, the LR250 generates a narrow, focused beam, allowing for smaller horn antenna options and reducing sensitivity to obstructions. Its unique design enables safe and straightforward programming using the Intrinsically Safe handheld programmer without the need to open the instrument’s lid.

The LR250 excels in measuring low dielectric media and performs exceptionally well in small vessels, as well as tall and narrow vessels, ensuring accurate and reliable level monitoring.

  • Graphical local user interface (LUI) makes operation simple with plug-and-play setup using the intuitive Quick Start Wizard
  • LUI displays echo profiles for diagnostic support
  • 25 GHz high frequency allows for small antennas for easy mounting in nozzles
  • Insensitive to mounting location and obstructions, and less sensitive to nozzle interference
  • Short blanking distance for improved minimum measuring range to 50 mm (2 inch) from the end of the antenna
  • Communication using HART or PROFIBUS PA
  • Process Intelligence signal processing for improved measurement reliability and Auto False-Echo Suppression of fixed obstructions
  • Programming using infrared Intrinsically Safe handheld programmer or over a network using SIMATIC PDM, Emerson AMS, or Field Device Tools such as PACTware or Fieldcare via SITRANS DTM
  • Functional Safety (SIL 2). Device suitable for use in accordance with IEC 61508 and IEC 61511
  • 3 mm (0.118 inch) accuracy in accordance with IEC 60770-1
  • Suitable for API 2350

Product Data Sheet – Siemen SITRANS LR250 Horn Antenna Rada Level Transmitter

Operation Manual – Siemen SITRANS LR250 Horn Antenna Radar Level Transmitter with mA/HART


Application Radar Level Transmitter

(Measuring Range)

Minimum Measuring Range:

50 mm (2 inch) from end of antenna

Maximum Measuring Range:

20 m (65 ft), antenna dependent

Output 4 … 20 mA
Measuring Accuracy 3 mm (0.118 inch)
Operating conditions -40 … +200 °C (-40 … +392 °F) (at process connection with FKM O-ring)

Up to 40 bar g (580 psi g), process connection and temperature dependent.

Degree of Protection Type 4X/NEMA 4X, Type 6/ NEMA 6, IP67, IP68
Weight < 3 kg (6.6 lb) 3.75 mm (1½ inch) threaded connection with 1½” horn antenna
Electrical Connections 2 x M20 x 1.5 or 2 x ½” NPT
Explosion Protection IECEx (Dependent on Configuration)
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SIEMENS SITRANS LR250 Horn Antenna Radar Level Transmitter

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