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download articleVibronic level switch
Piezoelectric effect
| Function description The Liquiphant vibration probe analyses the change in frequency which is produced by a liquid on the sensor. The symmetrical fork paddles start vibrating piezoelectrically at their resonance frequency. The application of a voltage makes the piezo expand and the metal membrane is bent due to the rigidity of the ceramic disc. The main characteristic of the bimorph drive is its mechanical insensitivity. |
| Bimorph drive |
| Evaluation electronics Detection of frequency shift |
| Transmitter |
| Common electrode |
| Receiver |
| Resonant circuit |
| Force |
| Force |
| Ceramic disc |
| Piezoelectric effect |
Vibronic level switch
| Application limits and utitlization conditions |
| Viscosity change |
| Outside vibrations |
| Suspension |
| Density change |
| Electric property |
| Liquiphant vibration limit switch |
| Medium temperature: |
| Operating pressure: |
| Solids proportions: |
| Density: |
| Viscosity: |
| -58 to +300F (-50 to +150°C) |
| -15 to +900 psi (-1 to +63 bar) |
| min. 0.5 g/cm3 |
| 1 mm2/s up to 10,000 mm2/s |
| max. diameter of 0.2" (5mm) |
| Scale formation |
| Foam |
| Pressure and temperature change |
| Turbulences |
| Air bubbles |
| Changing media |
For more information: Endress+Hauser GmbH
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