Electrochemical sensing circuit having high dynamic range

Details Electrochemical sensing circuit having high dynamic range Electrochemical sensing circuit having high dynamic range

2007-02-27

2007-02-27

Noguerola, Alex (Department: 1753)

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C204S431000

Reexamination Certificate

active

10966822

ABSTRACT:
An electronic sensing circuit for an electrochemical gas sensor cell providing high dynamic range is described. The electronic circuit utilizes an amplifier with a resistive feedback element to provide high sensitivity linear sensing of low detected gas concentrations. The electronic circuit also provides the ability to source sufficient current to prevent the electrochemical gas sensor cell from becoming biased under very high gas concentration conditions. This operation is enabled by adding a non-linear element in the feedback path of the amplifier, which non-linear element begins to conduct during the high gas concentration conditions.

REFERENCES:
patent: 4642172 (1987-02-01), Fruhwald
patent: 6277255 (2001-08-01), Green et al.

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