Amperometric measuring device having an electrochemical sensor

Details Amperometric measuring device having an electrochemical sensor Amperometric measuring device having an electrochemical sensor

1993-09-07

1995-02-28

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

20415317, 204409, 204415, G01N 2726, G01N 27404

Patent

active

053933990

ABSTRACT:
An amperometric sensor device comprises in combination a sensor (21) having a planar structure obtained by photolithographic techniques and a circuit (22) for measuring the intensity of the electrochemical current generated by the sensor (21). The planar structure has an insulating substrate (23 to 25) and a set of electrodes composed of a working electrode (29), a counter electrode (30) and a reference electrode (31). A diffusion membrane (32) is deposited on the working electrode (29). Connection means (26) are provided to connect the electrodes (29,30,31) to the measuring circuit (22). According to the invention, the active conducting part of the working electrode (29), situated at the surface of the substrate (23) is entirely covered by the diffusion membrane (32) which overlaps this electrode (29) over its entire peripheral zone, whereas this membrane is entirely exposed so that, during the operation of the device (20) it is in contact with the fluid to be analysed over its entire surface.
The invention has applications in measuring the content of an oxygen reducible substance in a fluid, notably of chlorine in drinking water.

REFERENCES:
patent: 3791953 (1974-02-01), Minushkin et al.
patent: 4571292 (1986-02-01), Liu et al.
patent: 4694834 (1987-09-01), Meyerhoff et al.
patent: 4851088 (1989-07-01), Chandrasekhar et al.
patent: 4948490 (1990-08-01), Venkatasetty
patent: 5120420 (1992-06-01), Nankai et al.
patent: 5126034 (1992-06-01), Carter et al.

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