A stationary tyndallometer which can be used over long periods of time and by means of which control operations can be regulated makes provision for the scattered light measuring chamber to be of tubular or semi-tubular construction and to have appropriately fitted ring-gap nozzles or perforated metal sheets allocated to the inlet and the outlet and aligned parallel to the inside wall. In addition, the transmitter tube and receiver tube allocated to the scattered light measuring chamber are connected to a mechanical interrupter via an optical waveguide carrying primary light. Finally, the scattered light measuring chamber receiver has a preamplifier which is connected to a main amplifier and a digital section with microprocessor via cables. IMAGE
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