Abstract: A method for determining a property of a fiber suspension comprises obtaining a sample and diluting the sample by a first dilution, thereby providing a diluted sample, while retaining essentially all of the sample, and mixing the diluted sample, thereby providing a mixed, diluted sample. By removing part of the mixed, diluted sample and retaining an amount of the mixed, diluted sample, further diluting the mixed, diluted sample by adding dilution water to the retained amount of the mixed, diluted sample, thereby providing a further diluted sample, while retaining essentially all of the mixed, diluted sample, mixing the further diluted sample, thereby providing a mixed, further diluted sample, and repeating these steps until the concentration is suitable for measuring the property of the further diluted sample, this property can be measured with high accuracy. A device for determining a property to be determined of a suspension is also provided.

Abstract: A method and a device for measuring concentrations especially in a pulp suspension, from which a sample has been taken. The sample is collected in a measuring vessel, in which a piston is guided upwards and downwards in order to press the sample from each direction through a measuring sensor collected at the side of the measuring vessel via communicating tubes connected in an upper and a lower position to the measurement vessel, whereby the sample is stirred totally to eliminate flocculation in the same. Measurement of the concentration of the sample is made either during the upwards and downwards movement of the piston in the measuring vessel and first occurs when the speed of the sample through the measuring sensor is constant and the sample has been homogenized after at least some movement upwards and downwards of the piston.

Abstract: The invention relates to a method and a device for measuring concentrations especially in a pulp suspension, from which a sample (3) has been taken. The sample (3) is collected in a measuring vessel (2), in which a piston (6) is guided upwards and downwards in order to press the sample (3) from each direction through a measuring sensor (5) connected at the side of the measuring vessel via communicating tubes (4,4′) connected in an upper and an lower position to the measurement vessel (2), whereby the sample (3) is stirred totally for eliminating of a flocculation in the same, whereupon a measurement of the concentration of the sample (3) is made either during the movement upwards or downwards of the piston (6) in the measuring vessel (2) and first when the speed of the sample (3) through the measuring sensor (5) is constant and the sample has been homogenized at least after some movement upwards and downwards of the piston.