ATAGO RX-5000i Automated Desktop Refractometer

Overview

The ATAGO RX-5000i Automated Desktop Refractometer is an ISO/IEC 17025-aligned precision optical instrument engineered for high-reproducibility measurement of refractive index (n_D) and Brix concentration in liquid samples. It operates on the fundamental principle of total internal reflection at the prism–sample interface, where incident light undergoes angular deviation proportional to the sample’s optical density. This deviation is quantified via a high-stability CCD array and converted into refractive index values using calibrated dispersion algorithms traceable to NIST-certified reference standards. The instrument integrates a solid-state Peltier temperature control system (±0.1 °C stability), eliminating dependency on external water baths and enabling strict thermal regulation per ASTM D1218 and ISO 21748 guidelines. Its wide dynamic range—spanning n_D 1.324200 to 1.580000 and Brix 0.00–100.00%—covers applications from low-concentration aqueous buffers to highly viscous syrups and glycol-based industrial fluids. Designed for routine QC/QA laboratories, the RX-5000i delivers metrological integrity under GLP and GMP frameworks.

Key Features

• Peltier-driven temperature regulation (5.00–75.00 °C), with real-time thermal feedback and automatic ATC (Automatic Temperature Compensation) compliant with ICUMSA GS2/3-15 and AOAC 932.12
• Capacitive touchscreen interface with intuitive icon-driven navigation and multilingual OS support (English, Japanese, Chinese, Spanish, German)
• Synthetic sapphire prism (Mohs hardness 9) and SUS 316 stainless-steel sample well for corrosion resistance against aggressive solvents, acids, and caustics
• High-resolution detection: 0.000001 refractive index resolution and 0.01% Brix resolution, supporting statistical process control (SPC) and capability analysis (Cp/Cpk)
• Expandable calibration architecture: 24 preinstalled scales (e.g., sucrose, sodium chloride, ethylene glycol, propylene glycol, HCl, NaOH) and capacity for up to 100 user-defined empirical or polynomial calibration curves
• FDA 21 CFR Part 11-compliant software option (RX-5000i Data Manager) with audit trail, electronic signatures, role-based access control, and encrypted data storage

Sample Compatibility & Compliance

The RX-5000i accommodates diverse sample types—including aqueous sugar solutions (juices, honey, jams), pharmaceutical excipients (sorbitol, mannitol syrups), industrial coolants, metalworking fluids, cleaning agents, and semiconductor-grade etchants—without requiring dilution or filtration in most cases. Its robust optical path design minimizes scattering effects from suspended particulates ≤5 µm. All measurements adhere to internationally recognized standard methods: ICUMSA for sucrose determination, ASTM D115 for glycol concentration, USP for particulate matter screening (via turbidity correlation), and ISO 21527-1 for yeast viability assessment (indirect Brix correlation). Instrument validation documentation includes IQ/OQ/PQ templates aligned with Annex 11 and EU GMP requirements.

Software & Data Management

Data acquisition and reporting are managed via the optional RX-5000i Data Manager software, validated for regulated environments. It supports automated export to CSV, PDF, and LIMS-compatible XML formats. Each measurement record contains timestamp, operator ID, temperature, n_D, Brix, scale ID, and raw sensor output. Audit trails log all user actions—including scale edits, calibration events, and report generation—with immutable timestamps and digital signature verification. Data encryption complies with AES-256 standards; local database backups are scheduled automatically and can be synchronized with network drives. Integration with LabVantage, Thermo Fisher SampleManager, and Waters Empower is supported through ODBC and HL7 interfaces.

Applications

• Food & Beverage: Brix quantification in fruit juices, soft drinks, dairy concentrates, and fermentation broths per AOAC 932.12 and Codex Alimentarius STAN 212-1995
• Pharmaceuticals: Excipient concentration verification in oral liquids, syrup formulations, and parenteral solutions per USP and EP 2.2.2
• Chemical Manufacturing: Glycol content monitoring in antifreeze, ethylene oxide scrubbers, and solvent recovery streams per ASTM D115 and ISO 1042
• Automotive & Metalworking: Coolant concentration control in CNC machining fluids and electroplating baths per SAE J1940 and ISO 6743-11
• Academic Research: Refractive index profiling in polymer solution thermodynamics, colloidal stability studies, and microfluidic concentration gradients

FAQ

Does the RX-5000i require daily recalibration?
No. With stable ambient conditions and use of certified ATAGO calibration standards (e.g., n_D 1.3330 @ 20 °C), calibration verification is recommended before each analytical session or every 8 hours of continuous operation.
Can it measure non-aqueous solvents like acetone or toluene?
Yes—provided the solvent is optically clear and does not chemically attack sapphire or SUS 316. A custom scale must be developed using certified reference materials for accurate conversion to concentration units.
Is the Peltier system capable of sub-ambient cooling?
No. The built-in thermoelectric module cools only to 5.00 °C minimum; external chillers are required for sub-zero measurements.
How is traceability maintained for regulatory audits?
Each instrument ships with a factory calibration certificate traceable to NIST SRM 14xx series refractive index standards, accompanied by uncertainty budgets per ISO/IEC 17025:2017 Clause 7.6.2.
What maintenance is required beyond prism cleaning?
Annual performance verification by an ATAGO-accredited service center is recommended; no consumables or lamp replacements are needed—the LED light source has a rated lifetime exceeding 50,000 hours.