Digital refractometer VariRef²

Brix scaledual-scalewith Peltier warming

Overview
The VariRef² full-range refractometer provides precise refractive index (RI) and Brix measurements across the complete measurement range. Available in models VariRef² 301, 401, 501 and 601. Multi-point calibration extends the usable range while the integrated Peltier temperature control and adjustable sample compartment allow reliable measurement of both liquid and solid samples. Browser connectivity and an optional pharma module (21 CFR Part 11) support regulated environments.

Checkpoints

• Liquid and solid sample measurement
• Multi-point calibration for full-range accuracy
• Fast Peltier temperature control and stabilization
• Modular design and network connectivity (Ethernet, RS232, USB, optional WLAN)
• Minimum sample volume 600 µL (micro-volume insert < 10 µL)
• Wetted parts: sapphire, FFKM, stainless steel (Hastelloy on request)
• ELN / LIMS ready; pharma module available (21 CFR Part 11)

Applications
Suitable for concentration and purity analysis, composition control and sample identification across food & beverage, pharmaceuticals, cosmetics, chemicals, petrochemicals and winemaking. Can be used for process control, QC labs and R&D.

• AdBlue® / DEF concentration
• Beer production: gravity, alcohol, wort concentration
• Brix / sugar concentration and purity
• Distillation and phase separation monitoring
• Liquid characterization and identification
• Pharmaceutical purity and infusion quality control
• Cooling lubricants, thermal fluids, oils
• Wine ripeness and must analysis

Specifications (summary)
Light source / wavelength: LED with 589 nm interference filter
Measuring scales: Refractive Index (RI), Sucrose (Brix), up to 1000 user-defined scales
Measuring range (by model): VariRef 301: 1.3200–1.5800 RI / 0–100 Brix | VariRef 401: 1.30000–1.66000 RI / 0–100 Brix | VariRef 501: 1.27000–1.71000 RI / 0–100 Brix | VariRef 601: 1.27000–1.72000 RI / 0–100 Brix
Accuracy: from ±0.0001 RI / ±0.05 Brix to ±0.00002 RI / ±0.015 Brix (model-dependent)
Resolution / Reproducibility: up to 0.000001 RI / 0.001 Brix; reproducibility down to ±0.000005 RI
Temperature control: integrated double-isolated Peltier, range 5 °C–80 °C (models 501/601 up to 100 °C; extended range on request)
Temperature sensor: 4-wire Pt1000 in prism; sensor accuracy 0.1 °C / resolution 0.01 °C
Minimum sample volume: 600 µL; micro-volume insert < 10 µL
Wetted parts: sapphire, FFKM, 1.4404 stainless steel (Hastelloy on request)
Interfaces: Ethernet, RS232, USB A, WLAN (with adapter)
Dimensions: with display 310 x 220 x 250 mm; without display 310 x 220 x 150 mm
Weight: 5.5 kg
Software: Aquisys3 Premium / Aquisys3 Premium Pharma
Standards: International Pharmacopoeia, ASTM, AOAC, DIN, FDA, ICUMSA; pharma module 21 CFR Part 11
Power supply: VAC 90–265 V, 50/60 Hz, max. 150 W

Technical characteristics

• LED light source with 589 nm interference filter
• Supports RI, Brix and up to 1000 custom scales
• Multi-point calibration for extended full-range accuracy
• High-precision models: accuracy to ±0.00002 RI; resolution to 0.000001 RI
• Integrated double-isolated Peltier temperature control; fast stabilization (~±0.1 °C in 1 min)
• Pt1000 sensor inside prism; automatic temperature compensation for Brix (ICUMSA)
• Minimum sample volume 600 µL; micro-volume option < 10 µL
• Wetted materials: sapphire, FFKM, stainless steel; Hastelloy optional
• Connectivity: Ethernet, RS232, USB A, optional WLAN; browser access for remote operation
• Optional 7" TFT touchscreen; Aquisys3 Premium software (Pharma option available)