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Working Principle

The probe forms a capacitance with the metallic tank-wall.
The capacitance is sum of three capacitance :

C(air)=ε(air) × P × (H - L)
C(material)=ε(material) × P × 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 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.

Using these values and following equation.
L(high) L(low) = C(high) C(low) / P × {ε(material) ε(air)}

device creates a chart of level to 4-20mA translation.


  • Free flowing homogeneous liquids Like oil, raw water, WFI, DM/DI water etc.
  • Suitable for top mounting.
  • Process temperature max. 200 ºC.
  • Process pressure max. 20 bar.
  • Suitable for corrosive liquids.


  • Compact size.
  • Rigid rod/flexible rope versions.
  • Wide range industrial dc power supply (15 to 60 VDC).
  • Loop powered device (true-two wire).
  • No potentiometers - hassle free calibration.
  • Various customized process connections like Threaded/Flanged/Hygienic etc.
  • Water bed sensing for oil/fuel/fatty-acid applications.
  • 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

Product Video

Coming soon...

Contact Us

39, Mangal Nagar, Behind Sai Ram Plaza, Near Rajiv Gandhi Circle, AB. Road,, Indore, Madhya Pradesh 452001, India

+91-731-656 2425, +91-731-243 5106,