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An electronic circuit continuously excites the tuning fork, causing it to mechanically vibrate. When the prongs of the fork contact anything with substantial mass, the resonant frequency of the fork decreases.
The circuit detects this frequency change and indicates the presence of mass contacting the fork. The forks’ vibrating motion tends to shake off any accumulated material, such that this style of level switch tends to be resistant to fouling.
It should be noted that the previous photograph of the tuning-fork style level switch is complete: the fork “paddles” are only a couple of inches long and require no physical extensions in order to properly detect liquid or solid material at that point.
Name
Tuning Fork
Model
(1) SD-YCo1SA-LM-200
(2) SD-YC71 (Explosion Proof Type)
Power Supply
24VAC/DC(Standard) 220 VAC, 110 VAC, (Optional)
Contact Capacity
220VAC 5A, DPDT
Medium Temperature
-10 °C~80°C (High Temperature Type: Max 150° C)
Working Pressure
Less Than 2MP a
Density of Medium
Min.05g/cm3
Electric Connection
M20 x 1.5
Wetted Material
SS304, SS316L Coated with PTFE
Connection
1″ NPT (M)
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