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Working Principle

RF Admittance is a static level sensor with no moving parts. Its sensing parts are:-

Earth Extension (body)

Compensation Shield

Sensing Rod

These parts form three capacitances:-

Shield Earth Capacitance

Shield Sense Capacitance

Sense Earth Capacitance

A Sine wave of high frequency is fed into both Sensing Rod as well as Compensation Shield. Voltage at shield is equal to voltage at sense, no effective current flows between sense and shield.

This removes shield-sense capacitance from the measurement. Shield-earth capacitance is ignored by circuit.

This removes the effect of material coating on probe.

Bulk is considered as fill-level and "wet" signal is issued

Coating is ignored as insignificant capacitance and "dry" signal is issued


  • Suitable for all sticky/non-sticky bulk solids & liquids.
  • Suitable for side as well as top mounting.
  • Process temperature max 600 ÂșC (ceramic insulation).
  • Process pressure max. 15 bar.
  • Minimum and maximum fail safe field selectable.


  • Compact size.
  • Universal industrial power supply (15 to 80 VDC & 15 to 260 VAC).
  • Low power consumption.
  • Easy calibration.
  • Active shield compensation against material build-up.
  • Static charge safe for fly-ash, acids, plastic & other applications susceptible to static charge/electricity.
  • Customized process connection like Threaded/Flanged etc.
  • Remote electronics version available on request.
  • Exd version available-suitable for gas group IIC, T6 as per IEC 60079-1-2007 & IEC 600529-2001.

Typical Mounting Positions

Product Video

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