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Liquid Level Control Vibration Tuning Fork Level Switch

1 Compact type and standard type

2 Process connection: Thread /flange/tri clamp

3.Material: stainless steel

4. Hemperature models available



Tuning fork vibration level switch is caused to vibrate by the resonance of the piezoelectric crystal. When effected by the material damping, the amplitude suddenly reduces, then the frequency and phase change significantly. These changes will be detected by the internal electronic circuit, and be transformed into a switching signal output. The product can monitor, control and alarm the high and low bit of tanks. Also it is suitable for a variety of liquid, powder, granular solid. It is practical, simple, reliable, adaptable and maintenance-free. The tuning fork and output have working condition and diode indicator, which can be adjusted as habit. Also it has two power supply input modes(220V AC and 24V DC) and many power supply output modes(DC output type, DC voltage output type, relay contact output type). All types have high and low alarm sets, which can be done sensitivity setting according to the situation.



  • Medium temperature range: -30 ° C to 150 ° C
  • Ambient temperature: -20 ° C to 80 ° C
  • Ambient humidity: ≤ 95% RH
  • Measured medium: liquid, powder or granular solid
  • Measured medium density: solid ≥ 0.1g/cm3, liquid ≥ 0.7g/cm3
  • Measured solid particle size: ≤ 10mm
  • Maximum liquid viscosity: <1000mm2 / s
  • Measured medium repose angle: ≥ 200
  • Pressure range: ≤ 1MPa ※ shell material: die-casting aluminum alloy
  • Fork material: 1Cr18Ni9Ti
  • Shell protection: IP65 ※ connection: 1 “NPT thread / flange (two ways)

Electrical parameters:
1: Supply voltage: 24 V DC; 220V AC 50Hz
2: Output signal: relay output double-pole double-throw (DPDT) contact capacity: 8A 220V AC 4A 24V DC
3: Power consumption: ≤ 2W
Tuning Fork Switch Ordering Information Sheet

Model Name
AFTL Tuning Fork Switch
Code Power Supply
1 220V AC
2 24V DC
Code Temperature Type
H High Temperature Type
S Common Type
Code Fork Sort
A Standard Type
C Shock Rod Type
S Compact Type
Code Fork Type and Insertion Depth Range
G1 Small Fork 45mm~3000mm
G2 Standard Fork 100mm~3000mm
Code Process Connection/Material
N1 1″ NPT thread/316ss
G1 G1″ thread/316ss
D25 DN25 PN4.0MPa/316ss
D40 DN40 PN4.0MPa/316ss
D50 DN50 PN4.0MPa/316ss
TC1 1″ Clamp/316ss
TC2 2″ Clamp/316ss
Code Shell/Cable Interface Size
A1 Die-cast Aluminum Shell Explosion-proof IP67/NPT 3/4″
A2 316ss Shell Explosion-proof IP67/M20X1.5
Customers Supply Insertion Length


Order sheet

Order sheet

Differential pressure transmitter Differential pressure transmitter