Arc control circuit

Details Arc control circuit Arc control circuit

1975-04-14

1977-04-19

Truhe, J. V.

Electric heating

Metal heating

By arc

361 52, H02H 900

Patent

active

040190170

ABSTRACT:
An arc control circuit supplies voltage to an electrode of a portable analyzer for striking an arc against a specimen to provide an aerosol of the specimen material for analysis. The circuit includes a source of voltage and voltage dividing means for selectively applying different proportions of the source voltage to the electrode. Sensing means are coupled to the electrode for actuating bypass switching means coupled to the voltage dividing means when the electrode has made contact with the specimen to apply the full voltage of the power supply to the electrode to start the arc. As the electrode tip is withdrawn from the sample a predetermined distance, the desired arc is maintained. Means are provided for quenching the arc by opening the bypass switch to lower the electrode voltage once the arc has been maintained for a desired amount of time.

REFERENCES:
patent: 2433678 (1947-12-01), Tyrner
patent: 2617913 (1952-11-01), Oestreicher
patent: 3141085 (1964-07-01), Manz
patent: 3627977 (1971-12-01), Aldenhoff
patent: 3714512 (1973-01-01), Grabowski
patent: 3791743 (1974-02-01), Cody et al.

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