Oxygen sensor

Details Oxygen sensor Oxygen sensor

1992-06-04

1993-08-24

Niebling, John

Chemistry: electrical and wave energy

Apparatus

Electrolytic

G01N 2726

Patent

active

052385523

ABSTRACT:
A bottomed, inner cylindrical member 21 is placed around a sensor element 2, and a bottomed, outer cylindrical member 24 is located around this inner cylinder 21. The inner cylinder 21 includes a hole 21a at a location opposite to the electrode of sensor element 2, and the outer cylinder 24 includes holes 24a and 24b at locations that are not opposite to the hole 21a. Between the inner and outer cylinders 21 and 24, there is a gap wide enough to prevent water from staying therebetween due to surface tension. Water entering the sensor assembly through the holes 24a and 24b in the outer cylinder 24 is immediately discharged out of the holes 24a and 24b through the gap between the outer and inner cylinders 24 and 21. Water, even when entering the outer cylinder 24, is unlikely to impinge directly on the sensor element 2 built in the inner cylinder 21.

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patent: 4683049 (1987-07-01), Nakajima et al.
patent: 4689136 (1987-08-01), Nakajima et al.

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