The intrinsically safe 26 GHz. pulse radar transmitter provides continuous level measurement up to 65.6’ (20m) with a 4-20 mA analog and HART digital signal output, and is configured via its integral push button display module or WebCal software. The non-contact liquid level sensor is intended for chemical storage or process applications in above or below grade tanks of any material. Select this sensor for challenging process conditions with corrosive media, light surface foam or agitation, higher temperature or pressure, condensation or vapor, and installation in a flange fitting. Typical applications include bulk storage and process tanks.


  • 316L antenna with PTFE inner shield for corrosive media
  • Configuration via push button display or WebCal software
  • 26 GHz. pulse radar is unaffected by vapor or condensation
  • 12” (30cm) dead band enables utilization of the entire tank
  • LCD displays level in feet or meters with percent of span bar
  • Optional display mode indicates the echo signal return curve
  • HART communication in point to point and multi-drop modes
  • Auto-temperature compensation for accurate measurement
  • Fail-safe diagnostics with selectable signal fail-safe outputs
  • Recognition, storage and rejection of false echo signal returns
  • IP67 stainless enclosure with polycarbonate display window


P/N Description From
LR21-5321-30-00 3″ ANSI flange, 316L w/PTFE shield, w/o Fob $3,450.00
LR21-5321-30-01 3″ ANSI flange, 316L w/PTFE shield, w/Fob $3,530.00
LR21-5321-40-00 4″ ANSI flange, 316L w/PTFE shield, w/o Fob $3,495.00
LR21-5321-40-01 4″ ANSI flange, 316L w/PTFE shield, w/Fob $3,575.00
LB11-1001 Intrinsic safety barrier $850.00


WebCal software is a PC utility program that enables users to easily configure and test compatible Flowline level sensors to their measurement and control requirements. Download your free copy.


Range: 12” to 65.6’ (30cm to 20m)

Frequency: 26 GHz.

Accuracy: ± 3mm

Dead band: 12” (30cm)

Beam angle: – 30: 12º, – 40: 8º

Configuration: Push button; WebCal® PC Windows® USB® 2.0; HART 7

Memory: Non-volatile

Display type: LCD, dot matrix

Display units: Feet and meters

Display bar: Percent of span

Display graph: Echo signal curve

Supply voltage: 21.6 to 26.4 VDC

Max. consumption: 22.5 mA

Signal output: 4-20 mA, two-wire, HART 7

Signal invert: 4-20 mA, 20-4 mA

Signal fail-safe: 3.9 mA, 20.5 mA, 22 mA

Process temp.: F: -40º to 302º, C: -40º to 150º

Temp. comp.: Automatic

Storage temp.: F: -40º to 176º, C: -40º to 80º

Pressure: -14.5 to 72 psi (-1 to 5 bar)

Enclosure rating: IP67

Encl. material: 316L stainless steel w/silicone gasket

Encl. window mat.: Polycarbonate

Conduit entrance: (1) 1/2” NPT connector

Antenna material: 316L w/PTFE inner shield

Process mount: – 30: 3” flange (ANSI), – 40: 4” flange (ANSI)

Classification: Intrinsically safe

Approvals (pending): ATEX IIG Ex ia II C T6…T3 Ga; IEC Exia IIC T6…T3 Ga; CSA Class I, Div 1, Groups A, B, C & D; Class II, Groups E, F & G; Class I Zone 0 IIC & Zone 20 Group IIC

Entity parameters: See control drawing #301901

Certification: FCC

Compliance: CE, CRN, RoHS


If you want help in selecting a sensor for your application, please submit a Level Questionnaire. An engineer will review your requirements and suggest a product solution via email.