Vibration Fork Level Switch

vibration fork level switch (also called a tuning fork level switch) is a point level sensor used to detect the presence or absence of liquids, powders, or granular materials in tanks, silos, or pipelines.

 Working principle

It operates on the vibration damping principle:

A fork-shaped probe vibrates at its natural resonance using a piezoelectric element

When the fork is in air → it vibrates freely

When it is covered by material (liquid/solid) → vibration is damped

This change in frequency/amplitude is detected and converted into an ON/OFF output signal �

ZINACA Instruments +1

Essentially, it detects whether material is touching the fork or not.

⚙️ Key features

No moving mechanical parts → long life & low maintenance

Works with liquids, powders, and granules

Not affected by:

Density

Conductivity

Foam or bubbles

Temperature & pressure variations �

VEGA +1

Fast response (≈1 second)

Can handle harsh environments (up to ~150°C, high pressure) �

ZINACA Instruments

 Applications

Storage tanks (high/low level alarms)

Silos (cement, grains, powders)

Chemical and pharmaceutical industries

Food & beverage processing

Water & wastewater treatment

Pump protection (dry-run prevention) 

ZINACA Instruments