A auto-calibrated microhole cathode array dissolved oxygen and ionic conductivity sensor

Author

Chen Yuquan ; Li Guang ; Lu Weixue

Author_Institution

Dept. of Sci. Instrum., Zhejiang Univ., China

fYear

1991

Firstpage

921

Lastpage

923

Abstract

A novel miniature auto-calibrated dissolved oxygen and ionic conductivity sensor has been developed. This sensor consists of two gold working electrodes, a Ag/AgCl reference electrode, a gold counter-electrode, and a Pt thermal resistant. It operates in a three-electrode potentiostatic mode. The two working electrodes have a multiple-cathode array separately. One is used for the measurement of oxygen and the other is used for calibration. The two working electrodes can also be used to measure the conductance of a solution by switching the sensor to the conductance measurement circuit. Evaluation of the sensor characteristics was undertaken and the results are promising. Calibration of the sensor was performed over the oxygen concentration range of 3-16 p.p.m. in a 0.1 N-1 N KCl solution in the 12-25 degrees C temperature range and at 760 torr pressure. A linear relationship is observed.<>

Keywords

chemical variables measurement; electric sensing devices; electrical conductivity measurement; electrical conductivity of electrolytic liquids; electrochemical analysis; oxygen; 12 to 25 degC; 760 torr; Ag-AgCl; Au; KCl solution; O/sub 2/; Pt thermal resistant; calibration; conductance measurement; dissolved O/sub 2/ sensor; electrocatalytic reduction; ionic conductivity sensor; linear dependence; microhole cathode array; miniature autocalibrated sensor; multiple-cathode array; three-electrode potentiostatic mode; Calibration; Cathodes; Conductivity; Electrodes; Gold; Sensor phenomena and characterization; Switching circuits; Temperature sensors; Thermal resistance; Thermal sensors;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Sensors and Actuators, 1991. Digest of Technical Papers, TRANSDUCERS '91., 1991 International Conference on

Conference_Location

San Francisco, CA, USA

Print_ISBN

0-87942-585-7

Type

conf

DOI

10.1109/SENSOR.1991.149038

Filename

149038