Combustible gas sensor

Details Combustible gas sensor Combustible gas sensor

1991-10-25

1993-07-06

Harvey, Jack B.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324693, 422 94, G01R 2722

Patent

active

052257860

ABSTRACT:
A combustible gas sensor includes a housing defining an interior containing a reference bead and a measurement bead which are fully exposed by the removal of the shroud or can therefrom. The beads are electrically connected in series and the reference bead is connected in parallel with a resister to define one side of a Wheatstone bridge. A liner consisting of a disk defining an inner face and an outer face overlies the reference and measurement beads. The inner face of the disk is provided with a slot opening at the inner face which is dimensioned to receive the reference and measurement beads therein. The slot provides a confined space for fluid communication between the fully exposed beads. A through running opening is disposed in the disk on each side of the slot adjacent the end of the slot in which the reference bead is disposed. A channel extends from each of the openings and communicates with the slot. The upper face of the disk is recessed and in combination with a porous closure defines a plenum in which the sample gas is first received prior to entering the through-running openings in the disk.

REFERENCES:
patent: 2901329 (1959-08-01), Kapff
patent: 3771960 (1973-11-01), Kim et al.
patent: 4720421 (1988-01-01), Khilnani

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