Circuit for measuring the electrode current of a ceramic gas sen

Details Circuit for measuring the electrode current of a ceramic gas sen Circuit for measuring the electrode current of a ceramic gas sen

1998-06-01

2000-12-12

Metjahic, Safet

Electricity: measuring and testing

Using ionization effects

For analysis of gas, vapor, or particles of matter

422 98, G01N 2762, G01N 2700

Patent

active

061604046

ABSTRACT:
The invention relates to a circuit for measuring the electrode current of a ceramic gas sensor for measuring a gas. The ceramic gas sensor has first and second sensor electrodes arranged in a heatable ceramic and the first sensor electrode functions as a measuring electrode and the second sensor electrode functions as a reference electrode. The circuit is a current measuring circuit connected to the first and second sensor electrodes and the current measuring circuit includes: a current measuring shunt (R2) for conducting a measurement current flowing away from the first sensor electrode thereby causing a first voltage drop across the current measuring shunt (R2); a first circuit part for detecting the measurement current; a current feedback shunt (R1) connected to the second sensor electrode; a second circuit part for generating a current having a magnitude corresponding to the magnitude of the measurement current detected by the first circuit part; the second circuit part being connected to the current feedback shunt (R1) whereby the current generated by the second circuit part flows to the second sensor electrode via the current feedback shunt (R1) causing a second voltage drop across the current feedback shunt (R1); and, a third circuit part for amplifying the difference of the first and second voltage drops and converting the difference into a measurement signal referred to a reference potential.

REFERENCES:
patent: 4147513 (1979-04-01), Bienkowski et al.
patent: 4233033 (1980-11-01), Eifler et al.
patent: 4792433 (1988-12-01), Katsura et al.
patent: 5054452 (1991-10-01), Denz

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