A.KRÜSS Optronic Brochure Refractometer
A.KRÜSS Optronic Brochure Refractometer, English PDF document.
View resource →Product overview
The AR4 is a classic analogue Abbe refractometer using transmitted light to determine refractive index and %Brix. Scales are adjusted with a drive knob and read through an eyepiece; an integrated digital thermometer displays temperature. A PT31 circulation thermostat can be connected when temperature control is required.
Advantages
Sample suitability and readout
- Measures liquids and viscous samples, as well as films and solids with at least one smooth surface.
- Transmitted-light measurement with drive-knob adjustment and eyepiece reading of refractive index and %Brix.
- SF4 optical flint-glass prism; sturdy construction and accessible sample area for cleaning.
Temperature measurement and external control
- An integrated digital thermometer displays temperature directly.
- Hose connections accept a separately purchased PT31 circulation thermostat; external control is not built-in temperature control.
- Digital temperature readout facilitates recording of measuring conditions and reduces thermometer-reading errors.
Technical data
| Item | Specification |
|---|---|
| Measurement range | nD 1.3000–1.7200; 0–95 %Brix |
| Measurement accuracy | nD ±0.0002; ±0.1 %Brix |
| Resolution | nD 0.0005; 0.25 %Brix |
| Wavelength | 589 nm |
| Temperature-measurement accuracy | ±0.5 °C |
| Temperature-measurement resolution | 0.1 °C |
| Temperature control | Retrofittable with a PT31 circulation thermostat |
| Scales | Refractive index nD and sucrose concentration %Brix |
| Adjustment | By adjustment screw |
| Parts in contact with the sample | Optical flint glass SF4 |
| Operation | Drive knob and eyepiece reading |
| Dimensions (W × H × D) | 100 × 270 × 190 mm |
| Weight | 2.5 kg |
| Operating voltage | 7.5 V |
| Maximum power consumption | 15 W |
Measurement accuracy is specified at λ = 589 nm, 20 °C, 1013 hPa and 50% relative humidity; temperature control requires a PT31 circulation thermostat.
Cleaning and maintenance
Clean the prism promptly after measurement to prevent dried or hardened residue. Remove the sample with a soft, lint-free cloth, then wipe with a slightly damp cloth. After markedly different samples, check cleaning with water or an appropriate reference.
Application areas
For identity, purity and concentration testing of raw materials, semi-finished and finished products, sugar-concentration measurement, incoming and outgoing goods inspection, hospital laboratories, education and pharmacies.
Calibration standard and contact liquid
The AR-series nD 1.5167 calibration standard and 5 ml cinnamon oil used as contact liquid must be purchased separately according to calibration requirements.
Related accessories and consumables
- PT31 circulation thermostat, 8–35 °C.
- AR4 temperature sensor and cable.
Service support
- Experienced specialists provide product selection, application and operation support.
- Calibration, maintenance and maintenance contracts can be discussed as required.
Selection guidance
AR4 is intended for routine or teaching measurements with manual eyepiece reading. Selection should consider sample transparency, range, reading resolution and whether PT31 external temperature control is required.