Conductive probe level control

Details Conductive probe level control Conductive probe level control

G - Physics

01

F

340/144

G01F 23/22 (2006.01) G01F 23/24 (2006.01)

Patent

CA 1094194

ABSTRACT OF THE DISCLOSURE: A liquid level control system is disclosed. The system includes at least one level sensing electrode which is fixedly mounted to a vessel and projects therein. The probe is adapted to contact a fluid within the vessel to utilize the electrical conductivity of the fluid to complete a circuit when the fluid contacts the probe. The probe is coupled between a point of reference potential and the control electrode of a single silicon controlled rectifier (SCR). The main electrodes of the SCR are serially coupled with the coil of a low-voltage A.C. relay and the secondary winding of a step-down transformer. Accordingly, the use of a relatively low accondary voltage avoids shock hazards; and, the sensitivity of the system is increased by the effective gain provided by the SCR. The use of an A.C. current in the probe avoids the galvanic corrosion which other- wise follows from D.C. current operation.

265784

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