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Working Principle

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

Amplitudes of vibration are above threshold when tines are free to vibrate.

When material touches fork tines, vibration stops as resonance gets disturbed.

Amplitudes of vibration, as seen by electronics falls below the threshold strength, material presence is thus detected.


  • Free flowing powders and granules (size max. 10mm).
  • Suitable for side as well as top mounting.
  • PTFE/PFA/ECTFE coatings for corrosive solids
  • Minimum and maximum fail safe field selectable.
  • Process temperature max 250 ÂșC.
  • Process pressure max. 15 bar.
  • Exd version available-suitable for Gas Group IIC, T6 as per IEC 60079-1-2007 & IEC 600529-2001


  • Compact size.
  • Universal industrial power supply. 15 to 80 VDC & 15 to 260 VAC).
  • Low power consumption.
  • No calibration required.
  • Various customized process connections. Starting from 1" threaded size.
  • Settable switching delay as a standard feature.
  • Remote electronic version available on request.

Typical Mounting

Product Video

Coming soon...

Contact Us

Trumen Technologies Pvt. Ltd.
86, Tilak Path, Rambagh Indore
PIN: 452 007 MP. India

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