Chemistry: analytical and immunological testing – Optical result
Patent
1994-11-14
1997-02-25
Le, Long V.
Chemistry: analytical and immunological testing
Optical result
436 43, 422 62, 422 63, 422 8205, 2503418, 25033911, 250910, 359507, G01N 120, G01N 2101, G01N 2115
Patent
active
056058411
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a sampling and analysing equipment for use in systems for receiving raw materials, in particular biological materials for delivery in a mixed or a processed condition in smaller portions or delivering materials in mixed or processing condition.
2. Description of the Prior Art
In WO/89/11090 is already described the advantages of using an automatic sampling equipment already described, from which samples of newly received materials can be rapidly transferred to a central analysing station, wherein the single samples are quickly analysed, thus enabling a quality determination of the new materials as a basis for a correct accounting in view of the qualities as well as for a rapid adjustment of processing or mixing conditions, should the new materials exhibit changed properties, regarding their content of fat, water or protein. A typical relevant application in preparation of fodder mixtures for livestock.
The equipment disclosed in the aforementioned WO publication is relatively expensive, and it is well applicable in large applications. In practice it is not suited for use in smaller applications, where it is an economical burden to arrange for automatic samplers and a pneumatic conveyor system between the sampling system and the analysing equipment. At least to a certain extent it is fully acceptable to manually carry the samples to the analysing equipment with the latter being simplified.
SUMMARY OF THE INVENTION
In connection with the invention it has been recognized that in fact it is possible to modify existing laboratory equipment to make it usable for automatic, successive samples handling and analysing, such that with a relatively modest investment it is still possible to achieve a noticeable increase of the analysing capacity with a minimum of labouring.
Two laboratory units are usable for this purpose, vis. an analyzer based on the so-called NIR principle and a grinding mill for comminuting the material to be analysed. In their known standard designs both of these units require a careful manual cleaning prior to each new operation. With the invention it is important that the required cleaning can take place automatically immediately after each operation such that the equipment will rapidly be ready for handling a new material sample without the new material sample being unduly contaminated by remnants of the previously handled sample material.
The commonly used grinding mills are unfit for cleaning in a sample and automatic manner. These mills have a knife rotor rotating inside a surrounding screen, outside of which there is an annular bowl for receiving the comminuted material. This bowl unit is made with rather sharp inner corners. Even if it is reasonably easy to clean manually, it will be difficult to clean in any simple, automatic way. According to the invention such a mill may be modified to form an automatically easily sealable unit, viz. by replacing the bowl unit with rigid insert parts, which, together define a receiver chamber having an evenly curved outer wall which is much easier to clean than the conventional bowls with sharp edges with the use of air nozzles. The insert parts may form a tangential outlet, thus enabling the mill to work on-line.
The laboratory units for NIR analysing comprise a cabinet having an optical head against which can be placed a cuvette holding a few grams of the material that is to be analysed upon being comminuted. After each operation the cuvette should be cleaned with spirits with all handling being performed manually. According to the invention it is possible to modify these units to an automatic on-line operation. It is an important aspect of the invention that the units are modified standard units owned by users desiring to change into automatic sample handling and analyzing. The reason for this is that such a user will already have spent a considerable amount of capital for achieving a good calibration of the measuring apparatus which requires a high number of e
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patent: 4575240 (1986-03-01), Hess et al.
patent: 4742228 (1988-05-01), Bischoff
patent: 5324949 (1994-06-01), Johnsen
patent: 5406084 (1995-04-01), Tobler et al.
Bjerre Michael
Heinrichson Jens
Johnsen Erik
Jesma-Matador A/S
Le Long V.
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