Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition
Patent
1997-02-28
1998-12-01
Pyon, Harold Y.
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
422 61, 422 681, 422 69, 422 99, 422112, 422104, 210 90, 210137, 436179, 436180, B01L 1100, G01N 110
Patent
active
058433791
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/DK95/00354 filed on Sep. 4, 1995.
BACKGROUND OF THE INVENTION
This invention refers to a sampling device for a chemical analysis apparatus, which device comprises a diaphragm attached to a diaphragm carrier, which has an inlet channel to the side of the diaphragm facing the carrier and a discharge channel going therefrom, which channels conduct the medium to be measured. The medium absorbs ions, molecules or particles, which penetrate the diaphragm.
AT 355 546 discloses a known dialysis system of the kind mentioned in the introduction. For this purpose, the dialysis diaphragm is attached to the outside of a curved diaphragm carrier. A number of grooves forming channels are provided in the upper side of the diaphragm carrier. FR A 1 573 147 shows a similar device, however with a plane diaphragm carrier. A medium to be measured flows through the channels and ions from the surrounding medium penetrate the dialysis diaphragm into the medium to be measured, which is then sent to a chemical analysis apparatus. Through JP A 59 170 742 it is known to mount a plate in which the channels are arranged.
SUMMARY OF THE INVENTION
The object of the invention according to this application is to provide a sampling device, which has a short reaction time and makes use of small amounts of medium to be measured.
The sampling device according to the invention forms a small sample volume under the diaphragm where the sample volume has a large exposable upper surface facing the diaphragm. Thus, according to the invention, the depth of the groove or the channel is determined in a special way and this means that this parameter is easy to determine. Also the width of the groove can be determined exactly during the production.
The adhesive required to attach the diaphragm to the diaphragm carrier is at the same time used for forming the groove, which conducts the medium to be measured. The adhesive may be applied to the diaphragm carrier or to the diaphragm in such a way that areas are formed, which are kept free from adhesive and these areas are in connection with each other so that an open path is formed. The surface made as a layer of adhesive can alternatively be arranged between two layers of tape. This makes it possible to work the surface layer by water jet cutting or by punching in the same way as it is possible to form a groove in an adhesive double layer of tape.
In an embodiment the groove is formed in a surface layer e.g. a metal sheet and the groove is thus formed by punching, laser cutting, water jet cutting or etching of the metal layer.
The metal sheet or a sheet of a different material can be applied to the diaphragm carrier by means of an adhesive or the diaphragm can be clamped on the metal sheet and retained by the outside of the diaphragm carrier. This means that the sampling device can be made simply and cheaply. If the sheet is made of plastic the groove or grooves can be formed by punching or by water jet cutting. Laser cutting may also be possible. By using plastic for the sheet it is avoided that the metal emits ions to the medium to be measured, which a metal might do and if so the measurement would be deteriorated or destroyed in certain applications.
It is further suggested that the sheet is made from double-sided adhesive tape. A simple attachment to the diaphragm carrier and a correspondingly simple attachment of the diaphragm to the upper side of the sheet is hereby achieved. The double-sided adhesive tape may have a protecting tape over the layer of adhesive during production and a groove can then advantageously be formed by water jet cutting, which gives a high degree of freedom in forming the groove.
When the groove is formed in the sheet by etching there is also a large freedom concerning the shape of the groove.
Different types of diaphragms are used for different purposes. Thus, it is possible to use the diaphragm as a filter or different pressures can be used on the sides of the diaphragm for a reversed osmosis. The diaphragms may as well be used without a
REFERENCES:
patent: 4366051 (1982-12-01), Fischel
patent: 4432806 (1984-02-01), Madsen et al.
patent: 4503333 (1985-03-01), Kulin et al.
patent: 4552552 (1985-11-01), Polaschegg et al.
patent: 4828543 (1989-05-01), Weiss et al.
patent: 5372709 (1994-12-01), Hood
Danfoss A/S
Pyon Harold Y.
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