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4 … 20 mA/HART – two-wire
TDR sensor for continuous level and interface measurement of liquids

Application area:

With VEGAFLEX 81 you can measure all kinds of liquids essentially
maintenance free. The sensor delivers precise and reliable measured
values even in applications with steam, buildup, foam generation or
condensation. VEGAFLEX 81 is a truly cost-effective level and interface
sensor for your measuring task.

Your benefit:

  • The guided adjustment enables a simple, time-saving and reliable
  • Comprehensive diagnosis options ensure maintenance-friendly
    operation and thus high plant availability
  • Shortenable probes allow simple standardization and maximum
    flexibility in planning



High frequency microwave pulses are coupled onto a cable or rod and
guided along the probe. The pulse is reflected by the product surface.
The time from emission to reception of the signals is proportional to
the level in the vessel.


Technical data:

Measuring range
-Cable probe up to 75 m (246.1 ft)
-Rod probe up to 6 m (19.69 ft)

Measuring accuracy ± 2 mm

Process fitting Thread from G¾, ¾ NPT; flanges from
DN 25, 1″

Process pressure -1 … +40 bar/-100 … +4000 kPa
(-14.5 … +580 psig)

Process temperature -40 … +200 °C (-40 … +392 °F)

Ambient, storage and transport temperature
-40 … +80 °C (-40 … +176 °F)

Operating voltage 9.6 … 35 V DC