A.KRÜSS Optronic Handheld refractometer scales, ranges and model accuracies
A.KRÜSS Optronic Handheld refractometer scales, ranges and model accuracies, English PDF document.
View resource →Product overview
The HR series consists of optical handheld refractometers requiring no external power. A small sample is placed on the prism and the model-specific scale is read directly through the eyepiece against a light source.
The “-T” suffix denotes automatic temperature compensation. Within the specified range, a mechanical bimetal mechanism corrects the scale reading directly without conversion tables. HRB90 and HRND instead include a 6–36 °C thermometer.
Models and core specifications
| Model | Scales and ranges | Measurement accuracy | Temperature function |
|---|---|---|---|
| HRB10-T | %Brix: 0–10 | ±0.1 %Brix | Automatic temperature compensation, 10–30 °C |
| HRB18-T | %Brix: 0–18 | ±0.1 %Brix | Automatic temperature compensation, 10–30 °C |
| HRB32-T | %Brix: 0–32 | ±0.2 %Brix | Automatic temperature compensation, 10–30 °C |
| HRB62-T | %Brix: 28–62 | ±0.2 %Brix | Automatic temperature compensation, 10–30 °C |
| HRB82-T | %Brix: 45–82 | ±0.2 %Brix | Automatic temperature compensation, 10–30 °C |
| HRB90 | %Brix: 0–90 | ±0.2 %Brix | Integrated thermometer: 6–36 °C |
| HRB92-T | %Brix: 58–92; Baumé: 38–43 °Bé; water content in honey: 12–27% | ±0.5 %Brix; ±0.5 °Bé; honey water content ±0.5% | Automatic temperature compensation, 10–30 °C |
| HRH30-T | Water content in honey: 12–30% | ±0.1% | Automatic temperature compensation, 10–30 °C |
| HRKFZ-T | Ethylene/propylene glycol freeze point: −50–0 °C; battery-fluid density: 1.15–1.30 g/cm³ | Freeze point ±5 °C; density ±0.01 g/cm³ | Automatic temperature compensation, 10–30 °C |
| HRKFZG-T | Battery-fluid density: 1.10–1.40; G11/G12/G13 freeze point: −50–0 °C; screenwash: −40–0 °C | Battery-fluid density ±0.01 g/cm³; G11/G12/G13 ±1 °C; washer fluid ±5 °C | Automatic temperature compensation |
| HRM18-T | Refractive index nD: 1.3330–1.3600; serum protein: 0–12 g/dl; urine specific gravity: 1.000–1.050 | nD ±0.0005; serum protein ±0.2 g/dl; urine specific gravity ±0.002 | Automatic temperature compensation, 10–30 °C |
| HRND | Refractive index nD: 1.3330–1.5170 | nD ±0.0005 | Integrated thermometer: 6–36 °C |
| HRO32-T | %Brix: 0–32; grape-must concentration: 30–130 °Oe; potential alcohol: 4.4–19% | ±0.2 %Brix; ±1 °Oe; potential alcohol ±0.1% | Automatic temperature compensation, 10–30 °C |
| HRS10-T | NaCl: 0–10%; specific gravity: 1.000–1.070 | Salt content ±0.1%; specific gravity ±0.001 | Automatic temperature compensation, 10–30 °C |
| HRS28-T | NaCl: 0–28% | ±0.2% | Automatic temperature compensation, 10–30 °C |
Advantages
Power-free field measurement
- Optical eyepiece reading without battery or external power.
- Compact design for production, incoming inspection, agriculture and laboratory checks.
- Dedicated scales provide direct target-parameter readings and reduce conversions.
How automatic temperature compensation works
- Most “-T” models correct temperature effects automatically from 10 to 30 °C.
- The compensated scale value is visible directly through the eyepiece without a conversion table.
- HRB90 and HRND use an integrated thermometer rather than automatic compensation.
Wide range of dedicated scales
- Brix, honey water content, salinity, Baumé, grape-must concentration and potential alcohol.
- Ethylene/propylene-glycol freeze point, battery-fluid density and screenwash freeze point.
- Refractive index, serum protein and urine specific gravity for laboratory and medical work.
Using the specialised scales
Choose the scale for the sample
- The Brix scale represents sucrose-solution concentration; other mixtures require the appropriate method or product-specific conversion factor.
- HRO32-T potential alcohol is inferred from grape-must sugar content, not a direct measurement of alcohol in fermented wine.
- Honey water content, salt, antifreeze temperature, battery-fluid density and serum-protein scales are not interchangeable.
General technical data
| Item | Official specification |
|---|---|
| Measurement principle | Critical-angle optical refractometry |
| Reading | Eyepiece reading on a model-specific scale |
| Light source | Ambient light |
| Power supply | No battery or external power required |
| Automatic temperature-compensation range | 10–30 °C on most “-T” models; model-dependent |
Application areas
For rapid checks of juice, wine, beer, coffee, fruit, honey and syrup, and of brine, coolant, emulsions, battery fluid and medical samples in food, agriculture, viticulture, brewing, beekeeping, automotive, laboratory and industrial work.
Calibration standards and consumables
RK02 solid calibration standards and contact liquid are available for HRB82-T, HRB92-T and HRH30-T. Optional HRK01 covers, HRK02 covers with metal hinges, and cinnamon-oil contact liquid are also available.
Service support
- Experienced specialists provide product selection, application and operation support.
- Calibration, maintenance and maintenance contracts can be discussed as required.
Selection guidance
First define the measured parameter and range, then verify accuracy and whether automatic temperature compensation or an integrated thermometer is required. For multi-scale models, confirm every scale, unit and range.