A.KRÜSS Optronic Brochure Refractometer
A.KRÜSS Optronic Brochure Refractometer, English PDF document.
View resource →Product overview
The PR21S mounts directly in the process line, continuously measures refractive index and transmits results to a display or process-control system for uninterrupted real-time concentration and quality monitoring.
Advantages
Process installation and continuous monitoring
- Direct pipeline installation with standardised connections for concentration, mixing and fermentation control.
- Scratch-resistant, chemically resistant sapphire prism and stainless-steel measuring chamber.
- Relative process pressure 0–9 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 1.3200–1.5200; 0–90 %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) | 0–9 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 |
| Setup | Via PC/laptop; firmware included, no separate software required |
| Parts in contact with sample | Sapphire, PTFE, FKM and stainless steel 1.4305 |
| Mounting | Inline mounting |
| 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 × 190 × 220 mm |
| Weight | 3.5 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 |
| Range configuration | The instrument measuring range is configured individually for the application |
Measurement accuracy is specified at λ = 589 nm, 20 °C, 1013 hPa and 50% relative humidity.
Application areas
For online concentration, mixing and fermentation control in chemical, petrochemical, automotive and aircraft manufacturing, food, sugar, beverage and wastewater applications.
Related accessories
- Pre-assembled connection cable set for the PR21 series.
- PR21-series display for measured value and temperature.
- Three-part blind cover, weld-on socket and ball-head T connection.
Service support
- Experienced specialists provide product selection, application and operation support.
- Calibration, maintenance and maintenance contracts can be discussed as required.
Selection guidance
For processes with a suitable inline measuring point. Confirm media compatibility with wetted materials, pressure, temperature, CIP conditions, process connection, power supply and process interfaces.