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Working Principle

Electronics of LFV11 excites the piezo-electric-crystals inside the tuning fork, which makes the fork tines vibrate at their natural resonance frequency in free air.

When the 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.


  • All liquids from free-flowing to 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.
  • Process temperature max 150 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.
  • Various customized process connections like Threaded/Flanged/TC etc starting form 1/2".
  • External test option using magnet test key.

Typical Mounting Positions

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

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