Vibrating Tuning Fork Fluid Level Detection

Vibrating tuning fork switches for opening or closing electrical contacts at a preset fluid level.

Vibrating tuning fork fluid level switches are threshold contact trip devices which typically consist of a tuning fork which extends out from the switch housing.

In operation a piezoelectric oscillator is used to vibrate the tuning fork at its natural frequency for air.

A second piezoelectric device is used to pick-up the frequency of the vibrating tuning fork. When the fluid level rises and covers the tuning fork it will vibrate at a lower frequency.

This change in vibration frequency is used to detect when the required fluid level has been reached.

Glossary of Liquid Level technical terms

• Capacitive Fluid Level Measurement
• cmH2O – Centimetres of Water Column at 4 deg C Pressure Unit
• Conductive Fluid Level Detection
• Float Fluid Level Detection
• ftH2O – Feet of Water Column at 4 deg C Pressure Unit
• mH2O – Metres of Water Gauge at 4 deg C Pressure Unit
• mmH2O – Millimetres of Water Column at 4 deg C Pressure Unit
• Specific Gravity

Help from Liquid Level resources

• Determining the hydrostatic pressure range for a tank level sensor
• Measuring liquid level in a sealed tank with a hydrostatic pressure sensor
• Determining water tank volume using hydrostatic pressure
• Difference between vented and non-vented water level measurement
• Measuring the volume of liquid in a horizontal cylinder tank
• How do you measure the volume of a liquid using pressure
• Measuring liquid level in a tank using a dp sensor

Guidance with Liquid Level requirements

• Hydrostatic Liquid Level Sensors
• Hydrostatic Pressure
• Liquid Level Sensors

Tools for Liquid Level calculations

• Fluid Depth, Density, Gravity, and Pressure Calculator