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VEGAFLEX 81 TDR sensor

The VEGAFLEX 81 level sensor measures various types of liquids without the need for maintenance. The sensor provides accurate and dependable measured values even in situations with vapour, accumulation, foam production, and condensation. The cost-effective option for various level and interface measurements is the VEGAFLEX 81.

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  • Benefits
  • Function
  • Technical Data
  • Materials
  • Housing versions
  • Electronics versions
  • Approvals
  • Operation
  • Electrical connection
  • Dimensions
  • The guided adjustment enables a simple, time-saving and reliable setup
  • Comprehensive diagnosis options ensure maintenance-friendly operation and thus high plant availability
  • Shortenable probes allow simple standardization and maximum flex- ibility 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.

Measuring range


Ʋ Cable probe

up to 75 m (246.1 ft)

Ʋ 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

The wetted parts of the instrument are made of stainless steel. The
instrument seal is made either of FKM, FFKM or EPDM.

The housings are available as single chamber or double chamber version in plastic, stainless steel or aluminium. They are available with protection ratings up to IP 68 (1 bar).

The instruments are available in different electronics versions. Apart
from the two-wire electronics with 4 … 20 mA/HART, a four-wire version and two purely digital versions with Profibus PA and Foundation Fieldbus are available.

The instruments are suitable for use in hazardous areas and are approved e.g. according to ATEX and IEC. The instruments also have various ship approvals such as e.g. GL, LRS or ABS

The adjustment of the instrument is carried out via the optional display
and adjustment module PLICSCOM or via a PC with the adjustment
software PACTware and corresponding DTM. Further adjustment options are available via HART communicator as well as manufacturerspecific programs such as AMS™ or PDM.

Electronics and terminal compartment, single chamber housing

  • Voltage supply/Signal output
  • For display and adjustment module or interface adapter
  • For external display and adjustment unit
  • Ground terminal for connection of the cable screen


  • Cable version
  • Rod version
  • Flange version

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