FR2840068A1

FR2840068A1 - Water or moisture detector for closed chamber wall comprises sensory element of a material that loses its mechanical resistance in presence of moisture

Info

Publication number: FR2840068A1
Application number: FR0206430A
Authority: FR
Inventors: Vincent Letocart
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-05-27
Filing date: 2002-05-27
Publication date: 2003-11-28

Abstract

The detector incorporates a sensory element (2) that reacts to water or moisture received through a porous material (1) by losing its mechanical properties, releasing a spring (5) to deploy a visual indicator and at the same time changing the color of an inner component (4). The visual indicator has a transparent central member (10) and a two-color mobile element (11) that is pressed against a transmission assembly (6, 7) by a spring (12). The detector is held against the chamber wall by magnets, adhesive or a mechanical fastening.

Description

Rs2) vent toutes utilisees pour former un pont de Wheatstone.Rs2) are all used to form a Wheatstone bridge.

La presente invention concerne un dispositif de detection de presence d'eau eVou d'humdite sur la paroi des cuves enfermees dans une double enveloppe et le signalement definitif et permanent, a distance, qu'il y a ou qu'il y a The present invention relates to a device for detecting the presence of water and humidity on the wall of the tanks enclosed in a double envelope and the permanent and permanent signaling, at a distance, that there is or that there is

eu detection.had detection.

s Cette detection est traditionnellement effectuee, sur les cuves contenant des 3az sous pression ou des matieres inflammalies ou detonantes, par un systeme electronique, alimente par des piles electriques, qui doit etre suff'samment elabore et protege pour etre utilisable en zone dangereuse ou explosive. e Ceci entrane un prix eleve de l'appareil sans supprimer totalement les risques d'explosion en cas de sa destruction accidentelle au sein de la zone s This detection is traditionally carried out, on tanks containing pressurized 3az or inflammed or detonating materials, by an electronic system, powered by electric batteries, which must be sufficiently developed and protected to be usable in dangerous or explosive zones . e This results in a high price for the device without completely eliminating the risk of explosion in the event of its accidental destruction within the area

da nge re u se.da nge re u se.

Le dispositif selon ['invention permet de remedier a ces inconvenients. II est totalement depourvu de source d'energie electrique et de construction tres s simple. II comporte un capteur contenant une matiere sensible qui perd sa resistance mecanique en presence d'humidite, une transmission souple coulissant dans une gaine et un indicateur visuel dont le mobile est arme par un ressort. [)ans l'etat normal de l'appareil, le ressort appuie sur le mobile du voyant o qui s'appuie sur l'extremite de la transmission qui s'appuie, a son tour, sur un poussoir retenu par la piece sensible qui resiste a la poussee qu ressort. Le systeme peut rester indefiniment bloque dans cette position. Une zone du mobile du voyant, de couleur definie' est visible au travers de la partie transparente de The device according to the invention makes it possible to remedy these drawbacks. It is totally devoid of electrical energy source and very simple construction. It comprises a sensor containing a sensitive material which loses its mechanical resistance in the presence of moisture, a flexible transmission sliding in a sheath and a visual indicator whose mobile is armed by a spring. [) In the normal state of the device, the spring presses on the moving part of the indicator light o which is supported on the end of the transmission which is supported, in turn, on a pushbutton retained by the sensitive part which resists the thrust that comes out. The system can remain locked indefinitely in this position. An area of the indicator mobile, of defined color, is visible through the transparent part of

l'indicateur visuel.the visual indicator.

s Par la presence d'humidite, I'element sensible perd ses caracteristiques mecaniques et stecroule en permettant a la transmission et au mobile du voyant s By the presence of humidity, the sensitive element loses its mechanical characteristics and becomes stagnant by allowing the transmission and the mobile of the indicator

de se depiaGer sous la poussee du ressort. to trap itself under the thrust of the spring.

Une zone de couleur differente, du mobile du voyant, prend place dans la A different colored area, from the indicator's mobile, takes place in the

zone transparente de l'indicateur visuel. transparent area of the visual indicator.

En ference au dessin n 1: À Le capteur d'humidite est constitue d'un boftier (1), ouvert sur ses faces inferieure et superieure, dans lequel vent installes trots aimants (2), In ference to drawing n 1: À The humidity sensor is made up of a cabinet (1), open on its lower and upper faces, in which wind trots magnets (2) are installed,

destines a maintenir le capteur contre la cuve et le corps de detecteur (3). intended to hold the sensor against the tank and the detector body (3).

Ces pieces vent fixees par d u platre colore (4) cou le di rectement da ns le bo^tier. Apres sechage nature!, cette matiere est poreuse pour capter These pieces are fixed by colored plaster (4) directly in the housing. After natural drying !, this material is porous to capture

l'humidite et la transmettre a i'eiement sensible. humidity and transmit it to sensitive areas.

À lielernent sensible utilis () qst mnstitue de quatre lamelles de To the most sensitive user () which consists of four strips of

carton ondule placees debout pour offrir la resistance voulue a ltecrasement. corrugated cardboard placed upright to offer the desired resistance to crushing.

s À Le poussoir (13) transmet la poussee du tube (6) sur ['element sensib O s At The pusher (13) transmits the thrust of the tube (6) on the sensing element O

À La douille (8) est fixee au corps (3) par embo^tement ou par collage. À The bush (8) is fixed to the body (3) by fitting or gluing.

À La transmission est constituee d'un tube semi-rigide en polyamide (6) coulissant dans un autre tube en polyamide (7) de diametre superieur. La o longueur de la transmission est adaptee a la distance entre la zone a controler et la zone de Yisualisation À La gaine (7) est fixee au capteur et a l'indicateur par embo^'tement The transmission consists of a semi-rigid polyamide tube (6) sliding in another polyamide tube (7) with a larger diameter. The length of the transmission is adapted to the distance between the area to be checked and the viewing area. The sheath (7) is fixed to the sensor and to the indicator by socket.

sur une douilie (8) et une bague de maintient (9). on a bush (8) and a retaining ring (9).

À L'indicateur est constitue d'un corps en trots parties dont la piece centrale (10) est transparente. II est etanche pour eviter toute infiltration de À The indicator consists of a body in three parts, the central part (10) of which is transparent. It is waterproof to avoid any infiltration of

l'eau exterieure a la zone a controler. water outside the area to be controlled.

À Le mobile (1 t), de deux couleurs, est maintenu entre ie ressort (t2) et la transmission (6). Dans cette position, la couleur indiquant ltetat d'origine de l'appareil est visible sous la zone transparente. Apres une detection, le o mobile s'est deplace est laisse appara'^tre, sous la zone transparente, la À The mobile (1 t), in two colors, is held between the spring (t2) and the transmission (6). In this position, the color indicating the original state of the device is visible under the transparent area. After a detection, the mobile o has moved is left to appear, under the transparent area, the

couieur indiquant qu'il a fonctionne. color indicating that it has worked.

Selon des modes particuliers de realisation À Le bo'^tier (1), le corps de detecteur (3) peuvent etre en matiere According to particular embodiments of the housing (1), the detector body (3) can be made of material.

plastique ou en metal moule ou usine. plastic or metal mold or factory.

À Les aimants (2t vent decales pour permettre la recuperation d'un Magnets (2t wind decals to allow the recovery of a

eYentuel ruissellement d'eau sur la paroi. eYentual water runoff on the wall.

À Les aimants (2) peuvent etre remplaces par une matiere adhesive Magnets (2) can be replaced by an adhesive material

ou une fixation mecanique.or a mechanical fixing.

À La matiere (4) peut etre remplacee par une mousse synthetique À La matiere (4) can be replaced by a synthetic foam

o dont la rigidite et la porosite repondent aux besoins. o whose rigidity and porosity meet the needs.

À La douille (8) peut etre hxee au corps (3) par un hletage pour The socket (8) can be fixed to the body (3) by a fitting for

demonter le capteur et remplacer ['element sensible. remove the sensor and replace the sensitive element.

-3 L'6lAment sensible (5) pout Atm nstitud d'une suture moire, Costive d'autms pdui que l'eau, pour Mends l'applItlon de l'invention -3 The sensitive element (5) for Atm nstitud of a moire suture, Costive of autms pdui that water, for Mends the application of the invention

la demon d'ams produce guides.the demon of ams produce guides.

Les tugs (8) et (7) de la tmnsmslon Peugeot m mmscAs par The tugs (8) and (7) of the tmnsmslon Peugeot m mmscAs by

One tine et une gains mAtalliques.One tine and one metallic gains.

Lea gas _ I'in-f at Os -Lea gas _ I'in-f at Os -

em par conagg ou umbrage.em by conagg or umbrage.

4 28400684 2840068

Claims

claims

1) Device for detecting that there is or that there has been the presence of water or humidity on a pami, "characterized in that it operates by means of

mechanical properties of an element (2) sensitive to the product to be detected.

s 2) Device according to claim 1 characterized in that the moisture is transmitted to the sensitive element (2) by a porous material (1) serving as a binder

to the different pieces.

3) Device according to claims 1 and 2 characterized in that the

[The indication of the operation is obtained by a change of color of the

o visible part of the internal part (4).

4) Device according to claims 1 to 3 characterizes in that the

displacement of the internal parts (4), (6) and (7) is caused by a spring (5.

) Device according to claims 1 to 4 characterized in that all

of the energy necessary for the operation is contained in a spring

prestressed (5.

6) Device according to claims 1 to 5 characterized in that

[the indication is given locally or remotely as needed, by ia

length given to the transmission (3).

7) Device according to mvendicalfons 1 to 6 characterized in that the attachment o of the sensor () on the wall maintains an angle between the sensor and the wall for