W.c. Heraeus Gmbh

Werner Ptaschek

Dieter Wendt

Hubert Koukol

Walter Keller

Erich Hoffmann

The temperature of the dye bath in a vat or trough (1) is controlled in dependence on absorption change, which is photometrically sensed. A command value of dye acceptance speed related to temperature of the dye within the vat is provided, compared with actual temperature, and a control signal is derived which, in turn, controls a heat exchanger supplied, selectively, with a heating or cooling medium in order to control dye acceptance of at least one predetermined dye component of the bath by the material therein.

Apparatus for controlling the absorption of one or more color components

To permit flexibility in chemical testing steps, a plurality of automatic chemical apparatus units are arranged in modular form, each unit including a main sample receptacle transport conveyor to move the receptacle holding a sample to be tested in a main transport path, a plurality of test and treatment containers being associated with each unit, and a sampling transfer station is located to extract a sample of test substance from the sample receptacle and introduce it into one of the test and treatment containers, which test and treatment container is then moved in a separate test and treatment conveyor path along a plurality of testing and treatment stations until the entire analysis of the removed sample is completed, at which time a new sample receptacle is moved along the main path to the sampling transfer station for introducing a new sample into a subsequent test and treatment receptacle. Movement, in steps, of the sample receptacle and of the test and treatment containers is synchronized so that, at any one time, only one sample container is present at the sampling transfer station. If a plurality of such modular units are assembled together, the stepping of movement of the sample receptacle past the respective transfer stations of the respective modular units is controlled by the longest time period taken to carry out the analysis steps of any one modular unit, sample receptacles for subsequent tests being held at a sample feeder which supports the receptacles in a sinuous, meandering path for introduction, one at a time, to the analysis units in accordance with the slowest test procedures being carried out, so that errors in identification and coordination of test results with samples are reliably avoided.

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Bruchkobel, Germany

Werner Ptaschek