A.KRÜSS Optronic Brochure Refractometer
A.KRÜSS Optronic Brochure Refractometer, English PDF document.
View resource →Product overview
The PRB21S connects to the process with hoses so that part of the main process stream passes through the bypass measuring cell by pumping or hydrostatic pressure, enabling uninterrupted continuous measurement.
Advantages
Process installation and continuous monitoring
- A hose-connected bypass routes a partial process flow through the cell by pumping or hydrostatic pressure, without interrupting the process.
- Scratch-resistant, chemically resistant sapphire prism and stainless-steel measuring chamber.
- Relative process pressure 0–2 bar; process temperature 10–60 °C.
Scales, temperature compensation and cleaning
- Refractive-index nD, sucrose %Brix and user-defined scales; integrated temperature-monitoring sensor.
- ICUMSA or user-defined temperature compensation.
- IP65 instrument and IP67 connections; CIP cleaning up to 120 °C, distinct from the normal measuring-temperature limit.
Control-system connections
- RS-232, separate RS-232 for a display, two 0/4–20 mA analogue outputs, one relay input and two relay outputs.
- PC-based setup and adjustment; a separately purchased display provides local value and temperature readout.
Technical data
| Item | Specification |
|---|---|
| Measurement range | nD 1.3200–1.5600; 0–95 %Brix |
| Measurement accuracy | nD ±0.0002; ±0.2 %Brix |
| Resolution | nD 0.0001; 0.1 %Brix |
| Measurement period | Approx. 10 s |
| Wavelength | 589 nm |
| Process pressure (relative) | 0–2 bar |
| Process temperature | 10–60 °C |
| Ambient temperature | 0–40 °C |
| Ambient humidity | 10–90% (non-condensing) |
| Temperature-measurement accuracy | ±0.2 °C |
| Scales | Refractive index nD, sucrose concentration %Brix and user-defined scales |
| Adjustment and setup | Via PC/laptop; firmware is included and separate software is not required |
| Parts in contact with the sample | Sapphire, PTFE, FKM and stainless steel 1.4305 |
| Mounting | Bypass with flow cell |
| Additional features | ICUMSA or freely definable temperature compensation; IP65 overall (IP67 connections); CIP capable up to 120 °C |
| Interfaces | 1 × RS-232, 1 × RS-232 for display, 2 × analogue 0(4)–20 mA, 1 × relay input and 2 × relay outputs |
| Dimensions (W × H × D) | 220 × 110 × 220 mm |
| Weight | 3 kg |
| Operating voltage | 24 VDC (18–30 VDC) |
| Power consumption in measuring mode | 5 W without display; 6 W with display |
| Maximum power consumption | 6 W without display; 7 W with display |
Measurement accuracy is specified at λ = 589 nm, 20 °C, 1013 hPa and 50% relative humidity.
Application areas
For bypass real-time concentration and quality monitoring in chemical, petrochemical, automotive and aircraft manufacturing, food, sugar, beverage and wastewater applications.
Related accessories
- O-ring seal for process refractometers.
- Pre-assembled connection cable set for the PR21 series.
- PR21-series display for measured value and temperature.
Service support
- Experienced specialists provide product selection, application and operation support.
- Calibration, maintenance and maintenance contracts can be discussed as required.
Selection guidance
PRB21S suits processes where a bypass can be installed and sample flow needs independent control. Selection should confirm media compatibility with wetted materials, pressure and temperature, CIP conditions, installation point, power supply, and analogue and relay interface requirements.