Abstract: This invention relates to a device usable in an automatical apparatus for the determination of the rate of change of the physical state of a medium. This device has a series of cuvettes having two opposites shoulders which extend in the plane of the opening of the cuvette and a flexible film which is fixed on the shoulders. This film is provided with a series of oblong opening respectively arranged above the cuvette openings. An optical detection station is provided which has a light source generating a light beam which illuminates the upper face of the cuvette bowls and an optoeleclectronic detector placed below the bottom of the bowls.

Abstract: The invention relates to a device comprising a series of single-use cuvettes (C), each with a base, an upper face opposite said base with an opening and two opposing flanges (R<sb>1</sb>, R<sb>2</sb>) which each extend from the cuvette essentially in the plane of the opening. Said cuvettes are arranged side by side and fixed to each other by means of a flexible film (3) fixed to said flanges (R<sb>1</sb>, R<sb>2</sb>) and at least partially covering the openings of said cuvettes (C). Said film is provided with a series of openings (4) respectively arranged to the right of said openings on said cuvettes. The above finds application in an automatic analytical apparatus, particularly for the determination of the rate of change of the physical state of a medium.

Abstract: The invention relates to a drive arrangement for a series of cuvettes (C) forming a strip (2) fixed by means of a film (3) in an automatic analytical device (1), comprising at least one toothed belt (12), the teeth of which engage with the corresponding forms of the cuvettes. The above finds application in an automatic analytical device, particularly for the determination of the rate of change of the physical state of a medium.