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SITRANS LR140
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SITRANS LR140 is a 2-wire W-band FMCW radar sensor for level measurement of liquids and slurries up to 8 m. It features a compact, corrosion-resistant housing with Bluetooth setup, ideal for durable and flexible installations.
Key Features
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Bluetooth connectivity for quick configuration and monitoring via the SITRANS mobile IQ smartphone app
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PVDF radar sensor provides excellent chemical resistance, ideal for corrosive environments
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W-band FMCW radar technology with a narrow beam and small antenna—perfect for short-range level measurement in tight spaces
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Non-contact operation, approved for outdoor installations even without closed or pressurized tanks
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Penetrates plastic tank lids for measurement without direct contact with the medium
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Compact design, easily installed in constrained or hard-to-reach mounting locations
Typical Applications
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Liquid or sludge tanks, both indoors and outdoors
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Water, wastewater, or chemical systems with non-metallic tank covers
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Level measurement in tight installation spaces
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Secondary tanks, receiving pits, or utility shafts where large or intrusive sensors are unsuitable
| Category | Specification |
| Mode of operation | |
| Measuring principle | W band FMCW radar |
| Measuring range | 0 … 8 m (0 … 26 ft) |
| Frequency | 80 GHz nominal |
| Beam angle | 8° |
| Power Supply | |
| Voltage | 12 … 35 V DC |
| Current | 4 … 20 mA |
| Accuracy | ± 5 mm |
| Rated operating conditions | |
| Vessel pressure | -1 … +3 bar (14.50 … 43.51 psi g) |
| Ambient temperature | -40 … +60 °C (-40 … +140 °F) |
| Process temperature | -40 … +60 °C (-40 … +140 °F) |
| Storage temperature | -40 … +80 °C (-40 … +176 °F) |
| Design | |
| Weight | 0.5 kg (1.1 lb) |
| Material (sensor) | PVDF |
| Material (enclosure) | PBT |
| Process connection | 1-½” NPT, 1-½” BSPT, or 1-½” BSPP |
| Degree of protection | IP66/IP67 |
| Certificates and approvals | |
| General | CE, CFMUS, CCSAUS, RCM, EAC |
| Radio | CE, FCC, IC, Anatel, ICASA, NCC, KC, CITC, RCM, WPC, Telec, NBTC, MCMC |
| Canadian Registration Number (CRN) | • British Columbia 0F22218.51
• Alberta 0F20596.2 • Saskatchewan 0F2002.3 • Manitoba 0F7032.4 • Ontario 0F22218.5 • Quebec 0F05183.6 • New Brunswick 0F1490.07 • Nova Scotia 0F1490.08 • Prince Edward Island 0F1490.09 • Newfoundland and Labrador 0F1490.0 • Yukon 0F1490.0Y • Northwest Territories 0F1490.0T • Nunavut 0F1490.0N |
| Programming | |
| SITRANS mobile IQ app | SITRANS mobile IQ is a Bluetooth app that provides an intuitive interface to quickly configure, set up and monitor SITRANS LR100 series. More info: siemens.com/mobileIQ |
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