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BYPASS PROCESS REFRACTOMETER-PRB21         measuring instrument
Process Refractometer
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, it 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.

- Wide measurement range from 1.3300 - 1.5600 nD / 0 - 95% Brix
- Just 3 seconds measurement time
- Password-protected
- Prism in the sample chamber is easy to clean
- Stainless steel sample chamber is suitable for food samples
- User-friendly interfaces for direct connection to a PLC
- Minimal sample quantities required
- It is very easy to install with no special requirements



The bypass process refractometer can determine mixing ratios, quality and quantity inspection in the following industries:
- Pulp and paper industries
- Beverage industry
- Food industry
- Sugar and sweetener industries
- Textiles industry
- Pharmaceutical industry
- Chemical industry
- Petrochemical industry
- Metalworking industry
- Wastewater management


Measurement Range 1.3300 nD - 1.5600 nD
0 - 95 %Brix
Accuracy PRB-H: 0.00002 nD and 0.02 %Brix
PRB-S: 0.0002 nD and 0.2 %Brix
Resolution PRB-H: 0.00001 nD and 0.01 %Brix
PRB-S: 0.0001 nD and 0.1 %Brix
Measurement Units Refractive Index (nD)
Saccarose (%Brix)
Invert Sugar (%Brix)
Glucose (%Brix)
Fructose (%Brix)
Measurement Time 3 - 60 seconds
Temperature Sensor PT100
Temperature Measurement -10 to 99.9°C
Temperature Resolution 0.1°C
Temperature Measurement Accuracy 0.2°C
Temperature Compensation ICUMSA
Process Temperature -5 to 160°C
Ambient Temperature 0 - 60°C
Prism Sapphire
Illumination LED 590 nm
Housing Cast steel
Interface Analog 0/4-20 mA and RS-232
Protection Class IP65
Working Voltage 24 V
Display LCD 120 x 32 Pixel
Operation Touchscreen
Output 1 relay
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