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Potentiostatic circuits for electrochemical sensors

A sensor voltage and sensor technology, applied in the field of circuits driving electrochemical sensors, can solve problems such as extra consumption of background current anodes

Active Publication Date: 2015-04-29
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Hydrogen evolution on the sensing electrode also leads to background current, additional consumption of the anode and problems related to draining the evolved hydrogen from the sensor

Method used

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  • Potentiostatic circuits for electrochemical sensors
  • Potentiostatic circuits for electrochemical sensors
  • Potentiostatic circuits for electrochemical sensors

Examples

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Embodiment Construction

[0013] While the disclosed embodiments may take many different forms, particular embodiments of which are shown in the drawings and will be described in detail herein, it should be understood that the disclosure is to be considered as exemplary and illustrative of the principles thereof. The best mode for carrying out the same is presented, and the claims are not intended to be limited to the specific embodiments shown.

[0014] In one of these aspects, power consumption associated with detectors including electrochemical sensors, particularly gas sensors, is advantageously reduced. Electrochemical embodiments therein may include two, three, or more electrodes.

[0015] The fact that electrochemical sensors can generate their own power can be exploited. Some of this power can be used to power related circuits. Electronically variable load resistances such as transistors or diodes whose value is actively or passively adjusted can be used to maintain a desired potential betwee...

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Abstract

An electrochemical detector can be powered partly, or entirely by voltages generated by the sensor. Using either active circuits or a passive component which produces a predetermined voltage drop in the respective sensor, two electrode consumable anode oxygen sensors can be provided which do not evolve hydrogen during operation.

Description

technical field [0001] The present application relates to circuits and methods for driving electrochemical sensors. More specifically, the present application relates to circuits powered in part or in whole by power generated by corresponding sensors. Background technique [0002] Power consumption is an issue with electrochemical sensors. Conventional potentiostats must supply current to the sensor, even though the sensor would be able to generate its own current while operating in a simple two-electrode load resistor circuit. [0003] Conventional potentiostats actively force current through a counter / working electrode circuit in order to maintain a desired potential difference between the working and reference electrodes. Consumable anode oxygen sensors based on metals such as zinc or tin suffer from problems due to the sensing electrodes being driven to a potential at which they can evolve hydrogen. The effect becomes worse at elevated temperatures. Hydrogen evolutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G05F1/56
CPCG01N27/404G01N27/49G01N27/28
Inventor K.F.E.普拉特M.韦勒L.肖A.侯赛因马迪
Owner HONEYWELL INT INC
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