YK-TFA

Tuning Fork Level Switch

YK-TFA series tuning fork level switch is a new type of level switch designed based on the principle of vibrating tuning forks. A piezoelectric crystal at the base drives the fork tines, while another piezoelectric crystal senses the vibration signal, forming a feedback loop that keeps the fork in resonance. When material comes into contact with the fork, the vibration amplitude gradually decreases until resonance stops, at which point the control circuit outputs a switching signal. Due to the natural attenuation of sensitivity from the fork tip toward the base, material buildup or discharge around the vessel does not cause false signals. In simple terms, the tuning fork is excited by a piezoelectric crystal to produce mechanical vibration at a specific frequency and amplitude. When immersed in liquid or solid material, the vibration characteristics change. This frequency shift is detected by the electronic circuit and converted into a switching output.

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technology parameter

Structure Type	Integrated Type, Split Type	Connection Method	Threaded Type, Flanged Type
Housing Material	SUS304, SUS316, Aluminum Alloy	Power Consumption	1.5W
Probe Material	304, 316L	Ambient Temperature	-25 ～ 60℃
Process Temperature	-25 ～ 180℃	Operating Pressure	<4.0 MPa (customizable)
Accuracy	±0.5mm	Electrical Connection	M20×1.5 (customizable)
Output Type	Digital Output	Ingress Protection Rating	IP65, IP66
Certifications	Intrinsic Safety, Explosion-proof	Power Supply	220VAC, 24VDC

Selection

Measurement Task
Operating Temperature

A:≤80℃; B:≤120℃; C:≤200℃; D:≤300℃; E:≤400℃;
Pressure Rating

A:0–1.6MPa; B:0–2.5MPa; C:0–4.0MPa; D:0–6.3MPa; E:0–10MPa;
Output Signal

A:4–20mA; B:Discrete signal; C:No Output;
Power Supply

A:24VDC; B:220VAC; C:Non-powered;
Process Connection Size

A:DN20; B:DN25; C:DN32; D:DN40; E:DN50; F:DN65; G:DN80; H:DN100; J:DN125; K:DN150; L:DN200; M:G1/2 thread; S:1/2 NPT thread; T:G1 thread; Y:G1½ thread; Z:G1¼ thread; X:Other;
Insertion Length

A:0-100mm; B:0-200mm; C:0-300mm; D:0-400mm; E:0-500mm; F:0-600mm; G:0-700mm; H:0-800mm; I:0-900mm; J:0-1000mm; K:0-1200mm; L:0-1500mm; M:0-2000mm; N:0-3000mm; O:0-4000mm; P:0-5000mm;
Explosion-Proof Rating

A:Standard; B:EX Explosion-proof; C:EX Intrinsically Safe;
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