Working Principle of Capacitance Continuous Level Transmitter?


 

Working Principle of Capacitance Continuous Level Transmitter?

  • The probe forms a capacitance with the metalic tank-wall.
  • The capacitance is sum of three capacitance:- C(air)=ε(air) x P x (H-L) C(material)=ε(material) x P x L C(residual) is due to device itself.
  • Where ε(air) is the dielectric constant of air ≈1. ε(material) is dielectric constant of material. P is the constant of probe and installation, H is the active length of probe and L is the level of material
  • Capacitance to level translation is performed with the aid of on-site calibration also called “wet-calibration”.

    • The device stores a low level capacitance as level for 4mA and high level capacitance as level for 20mA as defined by the user.

    Applications:

    •  Suitable for top mounting.
      •  Process temperature max. 200 ºC.
      • Process pressure max. 20 bar.
      • Suitable for corrosive liquids.
      • Plastic industry, powder, granular etc

      Features:

      • Compact size.
      • Rigid rod/flexible rope versions.

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