Method and circuit arrangement for intermittent application of a

Details Method and circuit arrangement for intermittent application of a Method and circuit arrangement for intermittent application of a

1990-10-09

1993-05-11

Harvey, Jack B.

Electricity: measuring and testing

Electrolyte properties

Using a conductivity determining device

204406, 324444, G01N 2702

Patent

active

052104966

ABSTRACT:
A method and a circuit arrangement for intermittent application of an electrical DC or AC voltage by a switch to an electrode in contact with a material, in particular for cleaning the electrode. The method is suitable in particular for use in electromagnetic flow measuring technology. The objective is to protect the electrode from parasitic capacitances present in the switch and interference voltages occurring therein. This is achieved in that at least in the period in which no voltage is applied to the electrode, the electrical potential of the electrode is coupled to the terminal of the switch which is not allocated to the electrode. Impedance converters are suitable as coupling elements.

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patent: 4950378 (1990-08-01), Nagata
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patent: 5059908 (1991-10-01), Mina
Flowtec AG, "Durchfluss Fibel", pp. 15-28, 1985, Germany.

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