Ionization vacuum gauge circuit

Details Ionization vacuum gauge circuit Ionization vacuum gauge circuit

1979-12-11

1981-10-20

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With signal, indicator, or alarm

Discharge device and/or rectifier in the signal circuit

315107, 315136, 324405, G08B 2100, H05B 3703

Patent

active

042963567

ABSTRACT:
In a circuit for an ionization vacuum gauge having a thermionic filament, a control circuit receptive of a control current for controlling the filament and a switch for applying the control current to the control circuit, a circuit is provided for indicating a filament interruption independent of the state of the switch. The circuit includes at least one resistor by-passing the switch to provide a continuous sensing current to the filament and a detector for detecting the interruption in the sensing current and for indicating such an interruption.

REFERENCES:
patent: 3141994 (1964-07-01), Hornfeck et al.
patent: 3466534 (1969-09-01), Wallace
patent: 3576465 (1971-04-01), Harvey
patent: 3643247 (1972-02-01), Ratcliffe

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