Device for measuring the relative moisture of a gaseous medium or the equilibrium moisture of a material

Claim 1

A device for measuring the relative moisture of a gaseous medium or the equilibrium moisture of a material, including a holder having means for ingress and egress of moisture, a hygrometer sensing element having a moisture-dependent electric resistance and arranged in said holder in communication with said ingress and egress means, comprising the improvement wherein the holder is at least partly formed of a non-hygroscopic heat insulating body with hollow spaces closed in themselves, and including a plate-shaped bearer located in the holder, the hygrometer sensing element being housed in a hole in said plateshaped bearer, and a filter layer adjacent to the bearer and covering said hole, wherein the hole in the plate-shaped bearer is larger than the hygrometer sensing element, the bearer having flat sides lying opposite each other and each covered with said filter layer.

Claim 2

A device for measuring the relative moisture of a gaseous medium or the equilibrium moisture of a material, including a holder having means for ingress and egress of moisture, a hygrometer sensing element having a moisture-dependent electric resistance and arranged in said holder in communication with said ingress and egress means, comprising the improvement wherein the holder is at least partly formed of a non-hygroscopic heat insulating body with hollow spaces closed in themselves, and including a plate-shaped bearer located in the holder, the hygrometer sensing element being housed in a hole in said plateshaped bearer, and a filter layer adjacent to the bearer and covering said hole, wherein the hole in the plate-shaped bearer is larger than the hygrometer sensing element, the bearer having flat sides lying opposite each other and each covered with said filter layer.

Claim 3

A device for measuring the relative moisture of a gaseous medium or the equilibrium moisture of a material, comprising: a holder comprising a non-hygroscopic heat insulating body with distributed hollow spaces closed in themselves, the material of which is foamed plastic of low thermal conductivity and thermal capacity, said body including means for ingress and egress of moisture and defining at least one inlet opening; a plate-shaped bearer disposed internally of said holder within said opening; a hygrometer sensing element having a moisture-dependent electric resistance and which is carried by said plate-shaped bearer and exposed to moisture entering the atmosphere in said opening for measuring same, the plate-shaped bearer including at least one recess loosely housing therein said hygrometer sensing element, said bearer carrying a filter layer loosely covering said hygrometer sensing element, wherein one electric reference resistance independent of the ambient moisture with at least approximately the same temperature dependence of the resistance value as the moisture-dependent resistance of the hygrometer sensing element is also housed in a recess of the plate-shaped bearer, the plate-shaped bearer being made of electrically insulating material and having conductor tracks for connection both of the electric resistance of the hygrometer sensing element and of the reference resistance with a contact device; whereby moisture from outside the holder can readily contact the hygrometer sensing element, adverse effects by the relatively voluminous holder on quick adaptation to environmental temperature and moisture by the hygrometer sensing element are minimized and positive mechanical protection of the sensing element by the holder is obtained.

Claim 4

A device for measuring the relative moisture of a gaseous medium or the equilibrium moisture of a material, comprising: a holder comprising a non-hygroscopic heat insulating body with distributed hollow spaces closed in themselves, the material of which is foamed plastic of low thermal conductivity and thermal capacity, said body including means for ingress and egress of moisture and defining at least one inlet opening; a plate-shaped bearer disposed internally of said holder within said opening; a hygrometer sensing element having a moisture-dependent electric resistance and which is carried by said plate-shaped bearer and exposed to moisture entering the atmosphere in said opening for measuring same, the plate-shaped bearer including at least one recess loosely housing therein said hygrometer sensing element, said bearer carrying a filter layer loosely covering said hygrometer sensing element, wherein one electric reference resistance independent of the ambient moisture with at least approximately the same temperature dependence of the resistance value as the moisture-dependent resistance of the hygrometer sensing element is also housed in a recess of the plate-shaped bearer, the plate-shaped bearer being made of electrically insulating material and having conductor tracks for connection both of the electric resistance of the hygrometer sensing element and of the reference resistance with a contact device; whereby moisture from outside the holder can readily contact the hygrometer sensing element, adverse effects by the relatively voluminous holder on quick adaptation to environmental temperature and moisture by the hygrometer sensing element are minimized and positive mechanical protection of the sensing element by the holder is obtained.

Claim 5

A device for measuring the relative moisture of a gaseous medium or the equilibrium moisture of a material, including a holder having means for ingress and egress of moisture, a hygrometer sensing element having a moisture-dependent electric resistance and arranged in said holder in communication with said ingress and egress means, comprising the improvement wherein the holder is at least partly formed of a nonhygroscopic heat insulating body with hollow spaces closed in themselves, and including a plate-shaped bearer located In the holder, the hygrometer sensing element being housed in a hole in said plate-shaped bearer, and a filter layer adjacent to the bearer and covering said hole, an electric reference resistance independent of the ambient moisture and having at least approximately the same temperature dependence of resistance value as the moisture-dependent resistance of said hygrometer sensing element, said electric reference resistance also being housed in a hole in said plate-shaped bearer, wherein the holes in said plate-shaped bearer are two elongate slits running parallel alongside each other and housing therein the hygrometer sensing element and reference resistance, the bearer having oppositely placed flat sides, said filter layer covering each of said two flat sides and said two slits.

Claim 6

A device for measuring the relative moisture of a gaseous medium or the equilibrium moisture of a material, including a holder having means for ingress and egress of moisture, a hygrometer sensing element having a moisture-dependent electric resistance and arranged in said holder in communication with said ingress and egress means, comprising the improvement wherein the holder is at least partly formed of a nonhygroscopic heat insulating body with hollow spaces closed in themselves, and including a plate-shaped bearer located In the holder, the hygrometer sensing element being housed in a hole in said plate-shaped bearer, and a filter layer adjacent to the bearer and covering said hole, an electric reference resistance independent of the ambient moisture and having at least approximately the same temperature dependence of resistance value as the moisture-dependent resistance of said hygrometer sensing element, said electric reference resistance also being housed in a hole in said plate-shaped bearer, wherein the holes in said plate-shaped bearer are two elongate slits running parallel alongside each other and housing therein the hygrometer sensing element and reference resistance, the bearer having oppositely placed flat sides, said filter layer covering each of said two flat sides and said two slits.

Claim 7

A device for measuring the relative moisture of a gaseous medium or the equilibrium moisture of a material, comprising: a holder comprising a non-hygroscopic heat insulating body with distributed hollow spaces closed in themselves, the material of which is foamed plastic of low thermal conductivity and thermal capacity, said body including means for ingress and egress of moisture and defining at least one inlet opening; a plate-shaped bearer disposed internally of said holder within said opening; a hygrometer sensing element having a moisture-dependent electric resistance and which is carried by said plate-shaped bearer and exposed to moisture entering the atmosphere in said opening for measuring same, said holder body comprising a single piece of closed pore plastic, said holder opening being a blind recess opening through the underside of said holder and longitudinally extending substantially diametrally of said holder, wherein said holder is adapted for measurement of moisture in a material therebeneath, said bearer extending substantially diametrally of said holder in said blind recess with said one side edge facing out of said recess and the opposite side edge having at least portions engaging the closed end wall of said recess, and including conductors extending from said engaging edge portions through the body of said holder to its face opposite said recess for electrical connection; whereby moisture from outside the holder can readily contact the hygrometer sensing element adverse effects by the relatively voluminous holder on quick adaptation to environmental temperature and moisture by the hygrometer sensing element are minimized and positive mechanical protection of the sensing element by the holder is obtained.

Claim 8

A device for measuring the relative moisture of a gaseous medium or the equilibrium moisture of a material, comprising: a holder comprising a non-hygroscopic heat insulating body with distributed hollow spaces closed in themselves, the material of which is foamed plastic of low thermal conductivity and thermal capacity, said body including means for ingress and egress of moisture and defining at least one inlet opening; a plate-shaped bearer disposed internally of said holder within said opening; a hygrometer sensing element having a moisture-dependent electric resistance and which is carried by said plate-shaped bearer and exposed to moisture entering the atmosphere in said opening for measuring same, said holder body comprising a single piece of closed pore plastic, said holder opening being a blind recess opening through the underside of said holder and longitudinally extending substantially diametrally of said holder, wherein said holder is adapted for measurement of moisture in a material therebeneath, said bearer extending substantially diametrally of said holder in said blind recess with said one side edge facing out of said recess and the opposite side edge having at least portions engaging the closed end wall of said recess, and including conductors extending from said engaging edge portions through the body of said holder to its face opposite said recess for electrical connection; whereby moisture from outside the holder can readily contact the hygrometer sensing element adverse effects by the relatively voluminous holder on quick adaptation to environmental temperature and moisture by the hygrometer sensing element are minimized and positive mechanical protection of the sensing element by the holder is obtained.

Claim 9

A device for measuring the relative moisture of a gaseous medium or the equilibrium moisture of a material, comprising: a holder comprising a non-hygroscopic heat insulating body with distributed hollow spaced closed in themselves, the material of which is foamed plastic of low thermal conductivity and thermal capacity, said body including means for ingress and egress of moisture and defining at least one inlet opening; a plate-shaped bearer disposed internally of said holder within said opening; a hygrometer sensing element having a moisture-dependent electric resistance and which is carried by said plate-shaped bearer and exposed to moisture entering the atmosphere in said opening for measuring same, the plate-shaped bearer including at least one recess loosely housing therein said hygrometer sensing element, said bearer carrying a filter layer loosely covering said hygrometer sensing element, the sensing element comprising two cylindrical rods of unhygroscopic electrically insulating material, and arranged side-by-side with joined ends and forming a longitudinal groove therebetween, and an electrolyte solution held by capillary forces in said groove for defining a moisture dependent electrical resistance; whereby moisture from outside the holder can readily contact the hygrometer sensing element, adverse effects by the relatively voluminous holder on quick adaptation to environmental temperature and moisture by the hygrometer Sensing element are minimized and positive mechanical protection of the sensing element by the holder is obtained.

Claim 10

A device for measuring the relative moisture of a gaseous medium or the equilibrium moisture of a material, comprising: a holder comprising a non-hygroscopic heat insulating body with distributed hollow spaced closed in themselves, the material of which is foamed plastic of low thermal conductivity and thermal capacity, said body including means for ingress and egress of moisture and defining at least one inlet opening; a plate-shaped bearer disposed internally of said holder within said opening; a hygrometer sensing element having a moisture-dependent electric resistance and which is carried by said plate-shaped bearer and exposed to moisture entering the atmosphere in said opening for measuring same, the plate-shaped bearer including at least one recess loosely housing therein said hygrometer sensing element, said bearer carrying a filter layer loosely covering said hygrometer sensing element, the sensing element comprising two cylindrical rods of unhygroscopic electrically insulating material, and arranged side-by-side with joined ends and forming a longitudinal groove therebetween, and an electrolyte solution held by capillary forces in said groove for defining a moisture dependent electrical resistance; whereby moisture from outside the holder can readily contact the hygrometer sensing element, adverse effects by the relatively voluminous holder on quick adaptation to environmental temperature and moisture by the hygrometer Sensing element are minimized and positive mechanical protection of the sensing element by the holder is obtained.