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  • The bypass process refractometer PRB21 fills the gap between the DR6000 series of digital laboratory refractometers and the process refractometer PR21.
    The sample is directed through a bypass to the measurement chamber which is made of stainless steel, while the actual prism is made of sapphire and is thus particularly scratch-resistant. The PRB21 is usually connected to a PLC and is used for continuous process monitoring. The measurement interval is adjustable (>3 s) and the measurement result is not affected by either the colour or the turbidity of the sample. The PRB21 has various interfaces and can also be supplied with PROFIBUS on request.
    A display is also available for visual monitoring. The internal temperature sensor allows automatic temperature compensation and the measured temperature to be sent to the PLC.