The measurement principle of the promethium basis weight sensor is based on the absorption of beta radiation by the paper web. A high-performance semiconductor detector is used as a sensor. In comparison to conventional I-chamber sensors, it allows a better signal-to-noise ratio as well as quick and precise profile measurement. The latter is independent of filler content. The integrated DynaComp™ function compensates for contamination or deposits on the measuring windows.
The Voith LSC Basis Weight Sensor (Promethium) is used for measuring the basis weight of graphic paper and tissue. It is designed for a measurement range from 1 to 180 g/m².