Abstract
A novel Clark-type galvanic oxygen sensor has been fabricated, in which the indicator electrode is made from an industrially produced Ni Cu alloy containing ≃ 30% Ni. The exposed are of the tubular-shaped indicator electrode is about 10 cm 2. The anodeis prepared from cadmium. The sensor is filled with 6 M aqueous KOH solution. The 95% response time of the device is on average 50 s, its residual current at zero oxygen concentration is negligible, its lifetime is one to two years, its output-current variation is less than 5% in a one-year period and an excellent linear calibration curve for oxygen concentrations in the range 0–17 mg l −1 is observed.
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