How does the tuning fork level switch work?
The tuning fork of the level switch vibrates, due to the resonance of piezoelectric crystal. When the tuning fork is immersed into a liquid or bulk solid, there will be a sharp reduction in vibration amplitude; and the phase and frequency changes accordingly. The changes will be detected by internal electronic circuit, and finally converted into a switching signal.

HGYYK series tuning fork level switch offers a great solution for tank level monitoring, control and alarm, and it is compatible with a variety of materials including liquids, powders, and granular solids.

3 input modes: 24V DC, 110V AC or 220V AC
3 output modes: direct current output, relay contact output, current voltage output
All the types are available with high and low limit alarms and optional switch sensitivity.

Main Technical Parameters of the Tuning Fork Level Switch
1. Fork length: 100mm ~ 200mm (extended length available on request)
2. Power supply: 24V DC or 220V AC/60 Hz
3. Operation temperature: -40 to 80 Deg. C (standard), -40 to 130 Deg. C (Medium-temperature)
4. Ambient temperature: -20 to 70 Deg. C
5. Operation pressure: ≤2.5 Mpa
6. Medium density: ≥0.7 g/cm3 (liquid), ＞0.1 g/cm3 (solid)
7. Output method: 220V AC / 20mA, 24V DC / 0.5A
8. Power consumption: 1.5W (220V AC power supply), 0.25W (24V DC power supply)
9. Process connection: thread, flange
10. Electrical connection: M20×1.5
11. Housing protection: IP65
12. Explosion protection: Ex dII CT4
13. Relative humidity: ≤ 95%RH
14. Medium: Liquid, powder, or solid particle
solid particle diameter: ≤ 10mm
15. Liquid viscosity: ＜ 1000mm 2/s
16. Medium rest angle: ≥ 200
17. Pressure range: ≤ 1Mpa
18. Housing material: cast aluminium
19. Fork material: SS 304
20. Relay output: 8A 220V AC
21. DC Voltage output: 0 - 5V
22. DC current output: 0 - 10mA
23. Fork vibratory frequency: 300 ± 50Hz
24. Environmental vibration levels: V.L.4, acceleration is not more than 1g
25. Action time of the switch: 1 - 60S

Typical Applications of the Tuning Fork Level Switch
1. Serve as liquid level switch to measure and control the level of portable water, mineral water, diesel or gasoline
2. Paper pulp, glue, dye, chemical industry
3. Waste water, sludge, acid or alkali solution
4. Liquid which may generate gas
5. Beer, beer yeast, drinks
6. Solid powder or small particle with good mobility