GB2213596A
Expired / Lapsed
GB
⏱️ 0.0 years remaining
Disposable humidity sensor
Assignee: GE Protimeter Ltd
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Filing: 1988-12-30
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Granted: —
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Expires: 2008-12-30
Abstract
Abstract A disposable humidity sensor, for sensing the dampness or humidity of a wall or floor in a building, comprises a patch of flexible impervious film (A) having, on one side thereof a piece of moisture absorbent material (C) having a known moisture content/electrical conductivity relation, the patch having, around a border region thereof of said one side, an adhesive to secure it to the body of which the dampness is to be measured. After the patch has remained in place for a period sufficient to allow said piece of moisture absorbent material to reach humidity equilibrium with said body, the electrical conductance of said piece of moisture-absorbent materal is measured so that the dampness or humidity of the body under test determined. The electrical conductance of the material (C) may be measured by inserting through the impervious film (A), and into the piece of material (C), a pair of electrodes (H), at a predetermined spacing from one another, and measuring the electrical resistance between said electrodes. Alternatively the patch may itself provide an electrode assembly (B) connected with terminals (D) engageable by probes of an appropriately calibrated electrical measuring instrument. <IMAGE>
Inventors
- 👤 Fali Minocher Dadachanji
Bibliographic Details
Application Number
—
Jurisdiction
GB
Data Source
google_patents
Last Synchronized
2026-10-23 06:30
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/121
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
140 words
A humidity sensor comprising a patch of flexible impervious film having, on one side thereof, in a central area of the patch, a piece of moisture absorbent material having a known moisture content/electrical conductivity relation, the patch having, around a border region thereof, surrounding said central area, on said one side, an adhesive whereby the patch may be applied to a surface of the body of which the dampness is to be measured, and whereby, after the patch has remained in place on said body for a period sufficient to allow said piece of moisture absorbent material to reach humidity equilibrium with said body, the electrical conductance of said piece of moisture-absorbent material can be measured and hence the humidity of the piece of moisture absorbent material determined and thence the dampness or humidity of the body under test determined.
Claim 2
Dependent Claim
140 words
A humidity sensor comprising a patch of flexible impervious film having, on one side thereof, in a central area of the patch, a piece of moisture absorbent material having a known moisture content/electrical conductivity relation, the patch having, around a border region thereof, surrounding said central area, on said one side, an adhesive whereby the patch may be applied to a surface of the body of which the dampness is to be measured, and whereby, after the patch has remained in place on said body for a period sufficient to allow said piece of moisture absorbent material to reach humidity equilibrium with said body, the electrical conductance of said piece of moisture-absorbent material can be measured and hence the humidity of the piece of moisture absorbent material determined and thence the dampness or humidity of the body under test determined.
Claim 3
Dependent Claim
69 words
A humidity sensor according to claim 1 wherein a semi-permeable membrane which will allow the passage of water vapour to said piece of moisture absorbent material, but which will exclude liquid water and other contaminants, is extended across said central area over the piece of moisture absorbent material, said semi-permeable membrane being sealed at its periphery to said one side of said patch, leaving said adhesive border region exposed.
Claim 4
Dependent Claim
95 words
A humidity sensor according to claim 1 wherein said patch of flexible impervious film has, on said one side thereof, in a central area of the patch, a pair of electrically conductive flexible members or tracks applied thereto and forming spaced-apart electrodes, said piece of moisture absorbent material being applied to said one side of the patch so as to bridge said electrodes, said electrodes being connected with respective conductors accessible to an electrical measuring instrument when the patch is applied to the surface of the body of which the dampness is to be measured.
Claim 5
Dependent Claim
75 words
A humidity sensor according to claim 3 wherein a semipermeable membrane which will allow the passage of water vapour to said humidity sensitive membrane, but which will exclude liquid water and other contaminants, is extended across said central area over the humidity sensitive membrane, and said electrodes, on said one side of the patch, said semi-permeable membrane being sealed at its periphery to said one side of said patch, leaving said adhesive border region exposed.
Claim 6
Dependent Claim
119 words
A method of measuring the dampness or humidity of a body or structure comprising applying a humidity sensor according to claim 1 or claim 2 to the surface of said body or structure to be fixed thereto by said adhesive, leaving the humidity sensor in place for long enough for said piece of moisture absorbing material to reach humidity equilibrium with said body or structure, inserting through said impervious film of said sensor, and into said piece of moisture-absorbing material, a pair of electrodes, at a predetermined spacing from one another, and measuring the electrical resistance between said electrodes as a measure of the dampness or humidity of said piece of material, and hence of said body or structure.
Claim 7
Dependent Claim
71 words
A method of measuring the dampness or humidity of a body or structure comprising applying a humidity sensor according to claim 3 or claim 4 to the surface of said body or structure to be fixed thereto by said adhesive, leaving the humidity sensor in place for long enough for said humidity sensing membrane to reach humidity equilibrium with said body or structure, and measuring the electrical resistance between said electrodes.
Claim 8
Dependent Claim
22 words
A humidity sensor substantially as hereinbefore described with reference to, and as shown in Figures 1 and 2 of the accompanying drawings.
Claim 9
Dependent Claim
22 words
A humidity sensor substantially as hereinbefore described with reference to, and as shown in Figures 1 and 2 of the accompanying drawings.
Claim 10
Dependent Claim
22 words
A humidity sensor substantially as hereinbefore described with reference to, and as shown in Figures 3 and 4 of the accompanying drawings.
Claim 11
Dependent Claim
22 words
A humidity sensor substantially as hereinbefore described with reference to, and as shown in Figures 3 and 4 of the accompanying drawings.
Claim 12
Independent Claim
28 words
A method of measuring the dampness or humidity of a body or structure, substantially as hereinbefore described with reference to Figures 1 and 2 of the accompanying drawings.
Claim 13
Independent Claim
28 words
A method of measuring the dampness or humidity of a body or structure, substantially as hereinbefore described with reference to Figures 1 and 2 of the accompanying drawings.
Claim 14
Independent Claim
28 words
A method of measuring the dampness or humidity of a body or structure, substantially as hereinbefore described with reference to Figures 3 and 4 of the accompanying drawings.
Claim 15
Independent Claim
28 words
A method of measuring the dampness or humidity of a body or structure, substantially as hereinbefore described with reference to Figures 3 and 4 of the accompanying drawings.
Claim 16
Dependent Claim
9 words
Any novel feature or combination of features described herein.
Claim 17
Dependent Claim
9 words
Any novel feature or combination of features described herein.
References Cited (Backward Citations)
GB971584A
Cited
GB2112947A
Cited
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