The Standard Vibrating Fork Level Switch is designed to reliably detect the presence or absence of solid materials in various industrial applications. It features a fork-shaped sensor that vibrates at a specific frequency; when immersed in solid material, the frequency changes, triggering an electronic signal.
Applications:
- Free-flowing powders and granules (size max. 10mm).
Features:
- 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 ºC.
- Process pressure max. 20 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, starting from 1″ threaded size.
- Settable switching delay as a standard feature.
- Remote electronics version available on request.
- Exd version available—suitable for Gas Group IIC, T6 as per IEC 60079-1-2007 & IEC 600529-2001.
Working Principle:
The electronics of the switch excite the piezo-electric crystals inside the tuning fork, causing the fork tines to vibrate at their natural resonance frequency in free air. When material touches the fork tines, the vibration stops as resonance gets disturbed. The amplitudes of vibration are above the threshold when tines are free to vibrate. When the amplitudes of vibration, as sensed by the electronics, fall below the threshold strength, material presence is detected.