Sensor device
First Claim
1. A sensor device for determining the concentration of a substrate in a sample medium, said device comprising a plurality of electrodes and a membrane, only one of said plurality of electrodes being covered by said membrane, said one electrode being an amperometric, enzyme anode, and another of said plurality of electrodes being a reference electrode positioned outside the membrane cover of said enzyme anode, both said anode and reference electrodes being in contact with a flow measuring cell, said cell being a hollow channel located in a housing which comprises two housing parts, said channel defined by opposite faces of the two housing parts, wherein the maximum extension of said flow measuring cell normal to the flow direction of said sample medium is essentially the same as the diameter of a sensitive layer of said amperometric enzyme anode, and wherein one of said faces contains said sensitive layer of said amperometric enzyme anode and the other of said faces contains said reference electrode.
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Accused Products
Abstract
In order to produce a small-volume flow measuring cell with good flow characteristics in a sensor device for determining the concentration of a substrate in a sample medium, comprising an enzyme electrode which is covered by a membrane and a reference electrode, both of which are in contact with the measuring cell, the proposal is put forward that the reference electrode be located outside of the membrane cover of the enzyme electrode and that the maximum extension of the flow measuring cell normal to the flow direction of the sample medium essentially be the same as the diameter of the sensitive layer of the enzyme electrode.
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Citations
9 Claims
- 1. A sensor device for determining the concentration of a substrate in a sample medium, said device comprising a plurality of electrodes and a membrane, only one of said plurality of electrodes being covered by said membrane, said one electrode being an amperometric, enzyme anode, and another of said plurality of electrodes being a reference electrode positioned outside the membrane cover of said enzyme anode, both said anode and reference electrodes being in contact with a flow measuring cell, said cell being a hollow channel located in a housing which comprises two housing parts, said channel defined by opposite faces of the two housing parts, wherein the maximum extension of said flow measuring cell normal to the flow direction of said sample medium is essentially the same as the diameter of a sensitive layer of said amperometric enzyme anode, and wherein one of said faces contains said sensitive layer of said amperometric enzyme anode and the other of said faces contains said reference electrode.
Specification