ATAGO RX-5000α-plus Desktop Digital Automatic Refractometer

Overview

The ATAGO RX-5000α-plus is a high-precision benchtop digital automatic refractometer engineered for routine and quality-critical refractive index and Brix concentration measurements in industrial laboratories, food & beverage QC labs, pharmaceutical R&D, and chemical manufacturing environments. Based on the fundamental optical principle of total internal reflection at the prism-sample interface, the instrument determines refractive index (n_D) by precisely measuring the critical angle of incident light—converted algorithmically into Brix values (%) using the internationally accepted ICUMSA sucrose calibration curve. Unlike manual Abbe-type refractometers, the RX-5000α-plus eliminates operator-dependent alignment errors through fully automated sample detection, LED-based illumination, and real-time image analysis of the shadow line. Its robust aluminum-alloy chassis, sealed optical path, and thermally stabilized measurement prism ensure long-term repeatability under typical laboratory ambient conditions (15–30 °C), with inherent temperature sensitivity compensated via high-resolution ambient temperature monitoring (±0.5 °C resolution).

Key Features

• Fully automated measurement cycle: auto-sampling detection, prism hydration verification, and result calculation within <4 seconds per reading
• High-resolution 7-inch capacitive touchscreen interface with multilingual OS (English, Japanese, Chinese, Spanish, German)
• Dual-mode operation: direct Brix % output (0.00–100.00%, resolution 0.01%) and refractive index (n_D 1.3330–1.5330, resolution 0.0001)
• Integrated USB-C port and Ethernet (RJ-45) for data export, remote control, and LIMS connectivity
• Prism material: sapphire-coated BK7 glass—chemically inert, scratch-resistant, and compatible with aqueous, alcoholic, acidic, and mildly corrosive samples
• Self-diagnostic system with real-time error logging (e.g., insufficient sample volume, prism contamination, temperature drift warning)

Sample Compatibility & Compliance

The RX-5000α-plus accommodates liquid, semi-liquid, and low-viscosity paste samples (up to ~5,000 mPa·s) with minimal volume requirement (0.3 mL). It supports standard calibration with certified sucrose reference solutions (e.g., NIST-traceable 10%, 30%, 50% Brix standards) and allows user-defined calibration curves for non-sucrose matrices (e.g., glucose, fructose, NaCl, ethylene glycol). The instrument complies with key international standards governing refractometric analysis, including ISO 21745 (general requirements for refractometers), ASTM D1218 (standard test method for refractive index of hydrocarbon liquids), and JIS K 0061 (Japanese Industrial Standard for sugar content determination). While it lacks active Peltier temperature control, its design meets GLP documentation requirements when paired with external temperature-stabilized lab environments and validated SOPs.

Software & Data Management

The instrument operates natively without PC dependency but integrates seamlessly with ATAGO’s optional “RefractoLink Pro” software (v3.2+) for advanced data handling. This Windows-based application enables audit-trail-enabled data review (meeting FDA 21 CFR Part 11 requirements when configured with electronic signatures and role-based access), statistical process control (SPC) charting, batch report generation (PDF/CSV/XLSX), and trend analysis across multiple instruments. All measurements store timestamp, operator ID (optional login), ambient temperature, and instrument serial number—ensuring full traceability. Data export supports UTF-8 encoding for multilingual character integrity and is compatible with enterprise LIMS platforms via HL7 or ASTM E1384 message formatting.

Applications

• Food & Beverage: Brix verification in fruit juices, soft drinks, jams, honey, dairy concentrates, and wine must
• Pharmaceuticals: Excipient concentration checks (e.g., glycerin, propylene glycol), syrup formulation QC, and osmolality proxy assessment
• Chemical Industry: Glycol concentration in antifreeze coolants, ethanol/water mixture verification, and solvent purity screening
• Agriculture & Research: Plant sap solute potential estimation, fermentation broth monitoring, and seed viability assays
• Academic Labs: Teaching core optical principles (Snell’s law, dispersion, critical angle), method validation studies, and inter-laboratory comparison exercises

FAQ

Does the RX-5000α-plus include built-in temperature control?
No. It relies on ambient temperature stability and reports measured ambient temperature with ±0.5 °C resolution. For applications requiring strict thermal regulation (e.g., USP ), an external temperature-controlled room or water bath is recommended.
Can it measure non-sugar solutions like sodium chloride or ethylene glycol?
Yes—using user-defined calibration curves or preloaded industry-specific tables (e.g., NaCl % w/w, EG % v/v) available via firmware update.
Is prism cleaning automated?
No. Manual cleaning with lens-grade tissue and reagent-grade isopropanol is required between samples; the instrument detects residual film via optical contrast analysis and prompts cleaning if contamination is inferred.
What is the minimum sample volume required?
0.3 mL for reliable coverage of the 22 mm × 10 mm sapphire-coated prism surface.
Does it support GMP-compliant electronic records?
Yes—when used with RefractoLink Pro v3.2+ under validated configurations including password-protected user roles, immutable audit trails, and electronic signature workflows compliant with 21 CFR Part 11 Annex 11.