Flowline EchoBeam LR81 80 GHz Liquid & Solid Level Transmitter, 1 1/2 in. NPT, 4-20 mA w/HART Output, Vertical Cable

1 1/2 in. NPT
Product Type:
Liquid & Level Sensor
4-20 mA w/Hart
Max. Temperature:
176°F (80°C)
Liquid 98.4 ft./Solids 49.2 ft.
Medium Silo
10.00 LBS
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The EchoBeam LR81 general purpose 80Ghz radar liquid and solids level sensor transmitter technology is unaffected by most media, industrial or environmental factors and the Flowline intuitive Level Tap App makes configuration simple. The LR81 is a general purpose 80GHz radar level sensor transmitter that provides continuous level measurement up to 98.4 ft. (30m) for liquids or 49.2 ft. (15m) for solids with a 4-20 mA signal output. The level sensor transmitter is wirelessly configured over Bluetooth via the Flowline LevelTap® App and enables a worker to see the level, verify the status and manage the setting of connected level sensors transmitters from the safety of the ground or nearby catwalk. The level sensor transmitter measures liquid and solids media with a dielectric constant value of 1.6.

The LR81 measures such media as water, chemical or petroleum based liquids, and pellet, grain, powder or aggregate solids. The EchoBeam is for use in tank, sumo, lift station, weir, canal, reservoir, bin, conveyor or transfer station applications.


  • 80Ghz technology provides reliable, maintenance free operation
  • Zero dead band maximizes the potential fill capacity of small tanks
  • Bluetooth wireless configuration via the Flowline LevelTap­® mobile App
  • Measures level height, air gap, tank volume or open channel flow
  • Can optionally measures through top wall of plastic or fiberglass tanks
  • Has a rugged PVDF antenna and enclosure for corrosive liquids or solids
  • IP68 rated sensor for harsh outdoor or below grade installations


  • Medium silo transmitter
  • Application: Challenging
  • Process mount: 1 1/2 in. NPT
  • Mount gasket: Viton GLT for G thread only
  • Termination: Vertical cable
  • Signal output: 4-20 mA, two wire
  • Max signal distance: 1,000 ft. (304m)
  • Signal fail-safe: Selectable high, low or hold last value
  • Maximum range: Liquid 98.4 ft. (30m) with media dielectric ? 20 and no agitation or Solids 49.2 ft. (15m) with media dielectric ?6 and no dust
  • Minimum dielectric 1.6
  • Frequency: 80 GHz, W-band, FMCW
  • Accuracy: 0.4m to 30m, ±2mm, 0.00m to 0.39m, ±10mm
  • Beam angle: 8-degrees
  • Supply voltage: 12-30V DC
  • Max Consumption: 22.5 mA
  • Bluetooth version: Bluetooth 5.0
  • Bluetooth range: 26.2 ft. (8m)
  • Configuration: LevelTap® App (iOS & Android)
  • Memory: Non-volatile
  • Max temperature: 176° F (80°C)
  • Process temp.: -40° to 176° F ( -40° C to 80°C)
  • Temp comp: Automatic
  • Storage temp: -40° to 176° F (-40° to 80°C)
  • Pressure: -41.5 to 43.5 PSI (-1 to 3 bar)
  • Enclosure rating: Type 6P (IP68)
  • Enclosure and antenna material: PVDF
  • Cable jacket material: PVC
  • Cable seal material: Viton GLT (fluor-elastomer)
  • 2-Conductor shielded cable
  • Cable length: 32.8 ft. (10m)
  • Conduit connection: 1 in. NPT
  • Classification: General purpose (CSAus)
  • Approvals: C22.2 No. 61010-1-12
  • Compliance: FCC: Part 15.256, 15.209, 15C; ISED IC: RSS-102, RSS-211, RSS-247; UKCA RER 2017: 6(1)(a), 6(1)(b), 6(2); CE/RED 2014/53/EU: EN 302 372, EN 302 729, EN 301 489-1, -33, EN 300 328; SRRC: (No. [2002] 353); RoHS, REACH, CRN, conflict minerals


Data Sheet (PDF Download)

Quick Start (PDF Download)

Brochure (PDF Download)