Method for monitoring the optical transmissibility through an observation window and device for cleaning an observation window

摘要

The invention relates to a method and a device for monitoring the optical transmissibility of an observation window (2) for the spectroscopic analysis of the homogeneity of a mixture material in a mixing container. According to the method, a product-specific limit value for the spectroscopic data is stored in the analysis unit, which limit value must be undershot within a prespecified time. If the data does not fall below the limit value within that time, the analysis unit emits a signal which contains information to the effect that the observation window (3) is soiled to an unacceptable degree.;The device comprises an analysis unit in which product-specific limit value for the spectroscopic data can be stored, a cleaning device for cleaning the observation window and a switching unit for activating the cleaning device. The analysis unit is suitable for emitting a signal if the limit value is not undershot during the mixing process within a prespecified time. The analysis unit is connected to the switching unit such that, if the signal is present, the switching unit can activate the cleaning device.