Product overview
DR101-60, DR201-95 and DR301-95 are digital handheld refractometers for rapid field, production and laboratory analysis. Once a sample is applied, a result is displayed in approximately one second, eliminating subjective eyepiece interpretation.
The models differ not only in range and accuracy: DR301-95 adds a salt-content scale and two further scales on request, while protection class, dimensions, weight and power supply also differ.
Models and core specifications
| Model | Scales | Measurement range | Measurement accuracy | IP code |
|---|---|---|---|---|
| DR101-60 | Refractive index nD; sucrose concentration %Brix | nD 1.3330–1.4419; 0–60 %Brix | nD ±0.0005; ±0.35 %Brix | IP65 |
| DR201-95 | Refractive index nD; sucrose concentration %Brix | nD 1.3330–1.5318; 0–95 %Brix | nD ±0.0003; ±0.2 %Brix | IP64 |
| DR301-95 | Refractive index nD; sucrose concentration %Brix; salt content; two further scales on request | nD 1.3330–1.5318; 0–95 %Brix | nD ±0.00015; ±0.1 %Brix | IP50 |
Advantages
Digital measurement and fast operation
- Digital acquisition provides results independent of visual interpretation.
- Approximately one second after temperature equalisation with only 0.3 ml sample.
- The fully chromed measuring trough supports fast filling and cleaning.
Automatic temperature compensation
- DR101-60 and DR201-95 provide 10–40 °C compensation for the %Brix scale.
- DR301-95 temperature compensation is optionally activatable and can be used with its configured scales.
- Integrated temperature sensor with ±0.5 °C accuracy and 0.1 °C resolution.
Model positioning and scales
- DR101-60: refractive index nD and sucrose %Brix; IP65 and cleanable under running water.
- DR201-95: refractive index nD and sucrose %Brix with range extended to 0–95 %Brix.
- DR301-95: refractive index nD, sucrose %Brix, salt content and two further scales on request, up to five in total.
Scale and function selection
DR301-95 extended functions
- Three standard scales: refractive index, sucrose concentration and salt content. Two further scales, such as Oechsle (°Oe) or Baumé (°Bé), can be added on request, for up to five.
- Configurable alarm limits; use the supplied mains adaptor for benchtop work or a 9 V battery for mobile use.
- DR101-60 and DR201-95 %Brix compensation cannot be deactivated; DR301-95 compensation is selectable in the menu.
Technical data
| Specification | DR101-60 | DR201-95 | DR301-95 |
|---|---|---|---|
| Resolution | nD 0.0001; 0.1 %Brix | nD 0.0001; 0.1 %Brix | nD 0.0001; 0.1 %Brix |
| Measurement period | Approx. 1 s after temperature equalisation | Approx. 1 s after temperature equalisation | Approx. 1 s after temperature equalisation |
| Minimum sample volume | 0.3 ml | 0.3 ml | 0.3 ml |
| Temperature compensation | 10–40 °C; %Brix scale only | 10–40 °C; %Brix scale only | 10–40 °C; optionally activatable |
| Temperature accuracy/resolution | ±0.5 °C / 0.1 °C | ±0.5 °C / 0.1 °C | ±0.5 °C / 0.1 °C |
| Adjustment/operation | Membrane keypad | Membrane keypad | Membrane keypad |
| Parts in contact with sample | Optical flint glass SF4; fully chromed surface | Optical flint glass SF4; fully chromed surface | Optical flint glass SF4; fully chromed surface |
| Dimensions (W × H × D) | 110 × 62 × 32 mm | 130 × 80 × 40 mm | 180 × 100 × 60 mm |
| Weight | 160 g | 180 g | 500 g |
| Operating voltage | 1.5 V (1 × AAA battery) | 1.5 V (1 × AAA battery) | 9 V (1 × 9 V battery; mains-adapter operation also possible) |
Official notes: accuracy is specified at λ = 589 nm, 20 °C, 1013 hPa and 50% relative humidity; measurement period applies after temperature equalisation.
Display and power supply
All three models display the measured value and temperature on an LCD. DR301-95 also displays battery charge, temperature compensation and limits. DR101-60 and DR201-95 have no USB interface and do not support mains-adaptor operation; DR301-95 can use the supplied mains adaptor.
Application areas
For rapid refractive-index, Brix, salinity and concentration checks in food and beverage, pharmaceuticals, automotive and mechanical engineering, production quality control, incoming/outgoing inspection, research and teaching.
Calibration standards
Adjustment with demineralised water is supported. Refractive-index standards at nD 1.3400, 1.3900 or 1.4300 (25 °C) can be selected according to range for periodic calibration checks. Purchase standards separately as required; KALH traceable factory calibration is available.
Service support
- Experienced specialists provide product selection, application and operation support.
- Calibration, maintenance and maintenance contracts can be discussed as required.
Selection guidance
DR101-60 suits lightweight, waterproof basic work to 60 %Brix; DR201-95 is the general-purpose choice for 0–95 %Brix; DR301-95 suits higher accuracy, salt content or other customised scales. Also compare protection class, dimensions, weight and power supply.