DE696060C - Device for measuring diffusion rates - Google Patents

Description

Apparatus for measuring diffusion rates The present The invention relates to a device for measuring diffusion velocities, especially of liquids or gases in viscous or solid, optionally fusible substances such as bitumen, paints no. like., in the electric way, whereby the substance to be measured is brought between the electrodes of a capacitor.

In the known devices of this type, one is the electrodes provided with passage openings through which the liquids or gases to To be measured.

It has now been found that reliable measurement results can be obtained in a simple manner obtained when the device is designed according to the invention so that the spaces between the electrodes on the one facing the entry of the liquid or the gas Pages with consisting of porous, preferably ceramic material, expediently too a hollow body for receiving substance, liquid or gas supplemented strips O the like. Are tightly covered.

The advantages of the porous, possibly fire-resistant wall exist especially in an even distribution and an even attack of the diffusing substances as well as avoiding external currents. the wetted area can be measured precisely. This also creates an exact relationship between Dielectric constant bzxv. Diffusion rate and time.

Several electrodes, advantageously e of the same design, can arranged in a known manner one behind the other at equal intervals and alternating connected to different polarities.

The container intended to hold the substance to be measured can Can be heated by means of electrical resistance wires embedded in the porous walls be so z. B. substances that are solid at normal room temperature, in a castable form can be transferred.

Various embodiments of the subject invention are shown schematically on the accompanying drawing.

Fig. 1 illustrates a top view of a trough with inserted Electrodes.

Fig. 2 and 3 show, also from above, cells with cylindrical Trough and on their electrodes resting against one wall.

Finally, Fig. 4 illustrates in section another embodiment with box-like container.

In the narrow ceramic trough 1 for the substance to be measured 4 protrude like a comb against electrodes 2, 3 of alternating polarity also attached to the trough lid. The electrodes form tightly sealed transverse walls in the trough, which is in a container 5, e.g. B. with diffusing water 6 is arranged.

In Figs. 2 and 3, 7 denotes a suitably cylindrical cup, z. B. clay, 8 electrodes of one and 9 electrodes of the other polarity. The radial, Electrodes attached to holders are evenly spaced around the circumference of the mug. In the embodiment according to Fig. 2 with the substance to be measured 11, z. B. Lacquer, filled cup 7 in the diffusing substance IO, z. B. water or gas, placed in the container 12, while in the embodiment according to Fig. 3 with diffusing Substance 10 filled cup 7 is placed in the test substance 11 in the hardener 12.

In Fig. 4, 13 denotes a suitably metallic box for the substance to be measured with side strips 14 to support a porous, z. B. ceramic cover 15. Strip-shaped electrodes 16 protrude vertically from the bottom of the box upwards, while also strip-shaped electrodes 17 of the other polarity protrude from the cover 15 downwards. The metallic electrodes grip at equal intervals like a comb.

The box is filled with the substance to be examined. Then will the lid is inserted tightly at a certain distance from the upper edge of the box, so that an open top shell is formed by the box edges and the lid. In this z. B. poured water, which penetrates through the porous lid and then diffused into the substance to be examined.

Claims (6)

PATENT CLAIMS: I. Device for measuring diffusion velocities, especially of liquids or gases in viscous or solid, optionally fusible substances such as bitumen, paints, etc., by dielectric means which the measuring substance is brought between the electrodes of a capacitor, characterized in that the spaces between the electrodes on the Access to the liquid or gas facing sides with porous, preferably existing ceramic material, expediently to a hollow body for receiving substance, Liquid or gas supplemented strips qo. Like. Are tightly covered. 2. Apparatus according to claim 1, characterized in that several Electrodes of the same design in a manner known per se in a row arranged at equal intervals and alternately connected to different polarities are. 3. Device according to claims 1 and 2, characterized by a narrow trough for the substance to be measured with at least one porous wall in soft electrodes arranged in a comb-like manner and expediently attached to the lid for the trough protrude, which form the tightest possible closing transverse walls of the trough, with Trough and electrodes in rooms with the substances to be diffused, e.g. B. in one Water tank, are arranged. 4. Device according to claims 1 and 2, characterized by an expediently cylindrical beaker, either for receiving substance to be measured or of diffusing liquids or gases, each of which is the substance facing wall side electrodes radially at the same distance and expedient Distributed over the entire circumference on - holders are attached, eight are, with cups in addition Electrodes in a preferably cylindrical container for those not in the cup substances or substances located are arranged concentrically. 5. Device according to claims 1 and 2, characterized by a box for the substance to be measured with one at a certain distance-below the edge closing and with the edges a bowl-forming lid made of porous Fabric, with the electrodes of one polarity sticking upwards at the bottom of the box and those of the other polarity sticking down on the lid and both electrodes-- systems are at the same time arranged in a comb-like interlocking manner. 6. Device according to claims 1 to 5, characterized in that that for heating the cavity for the substance in the porous cell walls electrical resistance wires are used.