Inspection method of multilayer gas sensing device

Details Inspection method of multilayer gas sensing device Inspection method of multilayer gas sensing device

2006-03-21

2006-03-21

Raevis, Robert (Department: 2856)

Measuring and testing

Instrument proving or calibrating

Gas or liquid analyzer

C324S551000

Reexamination Certificate

active

07013701

ABSTRACT:
Provided is an inspection method for a multilayer gas sensing device, capable of certainly and easily detecting a defective product originating from faults such as gaps or cracks. For the inspection of the gas sensing device including a sensor cell in which a measured gas side electrode is coated with a porous diffusion resistance layer in a stacked condition and the diffusion resistance layer is further coated with a dense protective layer in a stacked condition, in a state where the gas sensing device is immersed in a conductive inspection solution and a reference electrode of the sensor cell is placed into a non-contact with the solution, a voltage is applied between the solution and the reference electrode to measure a current flowing therebetween. On the basis of the measured current value, a decision is made as to whether or not the insulation is kept between the solution and the reference electrode.

REFERENCES:
patent: 5419828 (1995-05-01), Nakano et al.
patent: 5969532 (1999-10-01), Usui et al.
patent: 6566887 (2003-05-01), Smith et al.
patent: 7-120429 (1995-05-01), None

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