Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1982-02-17
1985-10-15
Krawczewicz, Stanley T.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324 61P, G01R 2702
Patent
active
045477256
DESCRIPTION:
BRIEF SUMMARY
The invention addresses a process and an apparatus for determination of characteristic values accordable to a pourable food moved along a product path, in particular for grain and its processing products.
In a milling operation, to the present various material characteristics can only be measured with unsatisfactory precision.
The causes for this lie in a large number of factors. The good itself is to be found in two extreme conditions, namely on the one hand at rest, stored in silos, and on the other hand in flow from processing stage to processing stage. It is particularly difficult to obtain exact material values in a continually moving product, and therefore in practice, the laboratory method performed on samples has been used for determination of the exact value. To determine exact material values of a large quantity of a pourable good regularly entails the testing of many samples and the statistical evaluation of the result. Manipulation of the sample taking mechanism is awkward, particularly for large silo cells, since to the extent possible, samples must be drawn from various places within the silo, while within silos very high pressures and compressions are usual.
A further difficulty lies in the fact that the product moisture can vary between relatively wide extreme values, which has a direct influence on the product by volume, and also, for example, the density and electrical conductivity.
In the mill, generally various grain types are mixed together. However, it is not necessary that the mixing of the various sorts be performed very precisely, since in the subsequent processing stages a repeated mixing of the individual fractions can be performed if required. The individual type fractions have various physical properties among them, and in particular the bulk weight is different, and usually the product moisture content as well.
Constrained by these problematics, the measurement by sampling of individual physical quantities has remained an unsolved problem, and this applies quite particularly to the exact determination of the water content in the product.
In a familiar process for determination of the water content in grain, the grain is removed by a mechanism from a product stream in a batch or quasi-continuous operation, and poured in a certain weighed quantity into a measurement container. The measurement container is in part constituted as a condenser, and a measurement is made by determination of an electrical value in the form of the capacitance of the condenser constituted by the container with the product, and in evaluation is converted to the quantity of water present in the sample. This instrument reflects the actual water content of the measurement sample, but it is questionable with this method, whether the measurement values are representative of the entire product stream.
If the product is to be moistened to a particular water content, the product throughput must be received in a subsequent continuously operating weighing system, and the necessary supplemental water quantity computed and added. Although this system is employed relatively frequently in practice, it may often be insufficient for the requirements in a mill. If the moistures or water contents produced are namely determined by an exact laboratory method, for example, in a drying oven, variations in the relative moisture content of frequently up to half a percent, and sometimes up to one percent are discovered. The electrical measurement method here described has the particular failing that the values determined are very much type dependent. To exclude this factor, calibration must be performed for each grain type before beginning measurement. For transparent reasons, this calibration is useless in the case of a mixing of more than one type, if the mixing ratio itself is not precisely known or precisely defined.
It has further been seen that quite a number of measurement methods, for example the exact level measurement of a pourable good, obviously include analogous sources of error.
Grain has particular characteristics
REFERENCES:
patent: 3691457 (1972-09-01), Kriellaars
patent: 3886447 (1975-05-01), Tanaka
patent: 4133454 (1979-01-01), Arthur
patent: 4168466 (1979-09-01), Boldt
patent: 4173892 (1979-11-01), Khurgin
patent: 4259865 (1981-04-01), Myers
Kummer Emanuel
Oetiker Hans
Gebruder Buhler AG
Krawczewicz Stanley T.
Solis Jose M.
LandOfFree
Method and apparatus for the continuous determination of moistur does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for the continuous determination of moistur, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for the continuous determination of moistur will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2431950