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Working Principle

Electronics of LFV excites the piezo-electric-crystals inside the tuning fork, which makes the fork tines vibrate at their natural resonance frequency in free air.

When fork tines are immersed in liquid, the frequency of fork vibration falls due to the density of liquid.

This change in frequency is detected by the electronic circuit.

Liquid presence is thus detected.


  • For free-flow liquids with liquids viscosity up-to 10,000cP.
  • Suitable for side as well as top mounting.
  • Minimum and maximum fail safe field selectable.
  • Flow/no-flow detection in pipe-lines.
  • PTFE/PFA/ECTFE coatings for corrosive liquids.
  • Process temperature max 200 ÂșC.
  • Process pressure max. 15 bar.


  • Compact size.
  • Universal industrial power supply (15 to 80 VDC & 15 to 260 VAC).
  • Low power consumption.
  • No calibration required.
  • Customized process connections like Threaded/Flanged/Hygienic etc starting form 1/2".
  • Various o/p available like DC PNP/NPN/ Two wire DC 8/16, Two wire AC and NAMUR.
  • External test option using magnet test key.
  • 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

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Contact Us

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

+91-731-4972065, +91-8109062425