Measuring and testing – Moisture content or absorption characteristic of material
Patent
1995-02-16
1998-03-24
Cuchlinski, Jr., William A.
Measuring and testing
Moisture content or absorption characteristic of material
324694, G01N 2712, G01N 3338
Patent
active
057300240
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a test probe which primarily is intended for being applied in structural materials during production and/or building activity or when water damage has occured in a building and by which test probe moisture measurement can be performed undisturbed from outer factors in following of the drying up process of built in moisture or other not suitable, supplied moisture which can cause inconveniences in the form of mould and/or damage caused by putrefactions, as well as damage of floor coverings and other structural elements.
At present the problem of building moisture within the building sector is a scourge which besides the fact that it causes many practical problems, e.g. origin of mould and other "sick house" problems, is the source of very wide and in itself unnecessary increases in prices. Today the idea of the used technique to reveal the departure of building moisture is that you drill a hole in the building element in question to a desired depth, where you want to determine the moisture level. A transmitter is then inserted into the hole, by aid of which you can read on an after-connected instrument the temperature and the relative humidity of the material (RF %). Several types of transmitters are used and for all concern the unexactness proportionately is as large as about .+-.3-5% RF. The technique of this measuring method is relatively complicated and requires good knowledge in technics of measurement, which only in exceptional cases exsists within the building sector.
The object of the present invention is to provide a test probe, by which the problems exsisting in the transmitter which now are present on the market have been eliminated. The distinguishing features of the invention are set forth in the claims mentioned below.
Thanks to the invention, one has now achieved a test probe which in an excellent way fulfils its purpose, and at the same time, is both cheap and easy to produce. By aid of the test probe according to the invention it is possible to already from the beginning, i.e. from the stage of production of a structural work, to follow the development of the drying up of built in moisture, commonly called as building moisture, in most of the building elements, that a structural work consists of. Further the invention decreases the necessary knowledge of techniques of measurement, which are required up to a minimum and minimizes sources of errors which otherwise can occur principally in that its active part is able to be applied in the building element itself during the production stage on the building site. This fact makes it possible to measure the moisture state undisturbed by outer factors, where you really want to do it and whenever you want. Both the actual test probe as well as the indicating instrument are in fact much cheaper than the set of apparatus which today are present on the building market intended for similar applications. The test probe according to the present invention has an application range of a high quality in determination of actual moisture stage at a low price.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be further described below by aid of a preferred embodiment with reference to the drawings enclosed, in which
FIG. 1 schematically illustrates a test probe according to the invention which is cast into a structural work and
FIG. 2 schematically illustrates another embodiment of a test probe according to the invention in a condition cast into its position.
DESCRIPTION OF THE INVENTION
As illustrated in FIG. 1 a preferred, first embodiment of a test probe 1 according to the present invention consists of such a formation which is fixable in a structural material 2 during the production stage. It is, in other words, possible to be cast into e.g. concrete directly which is unique within the moisture measurement range. The test probe 1, which has such a quality that it can absorb and emit moisture in steam phase but not in liquid phase, includes an active part 3 consisting of a hygroscopic
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Studies on Concrete Technology, Dedicated to Sven G. Bergstrom, Swedish Cement and Concrete Research Institute, Stockholm, pp. 217-225, Dec. 1979.
Cuchlinski Jr. William A.
Hirshfeld Andrew
Sahlens Fuktkontroll
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