ATAGO RX-5000i Benchtop Digital Automatic Refractometer

Overview

The ATAGO RX-5000i is a high-precision benchtop digital automatic refractometer engineered for rigorous quantitative analysis of dissolved solids concentration—primarily expressed as Brix (% w/w sucrose equivalent)—and refractive index (n_D) across diverse industrial and research laboratories. Based on the principle of total internal reflection at the prism-sample interface, the instrument employs a high-stability LED light source (589 nm nominal wavelength), a precision-ground sapphire prism, and a linear CCD photodetector array to determine the critical angle of refraction with sub-microradian resolution. This optical architecture enables traceable, repeatable measurements compliant with international standard methods including ISO 2173, AOAC 932.12, and ICUMSA Method GS5/3-12. Designed and manufactured in Japan, the RX-5000i represents the flagship model of ATAGO’s RX-i series, delivering metrological performance suitable for quality control in regulated environments such as food & beverage production, pharmaceutical excipient testing, chemical synthesis monitoring, and academic physical chemistry research.

Key Features

• Full-color capacitive touchscreen interface with intuitive icon-based navigation and six customizable UI themes for ergonomic daily operation
• Integrated Peltier temperature control system (±0.1 °C stability) eliminating dependency on external water baths—critical for method reproducibility under varying ambient conditions
• FDA 21 CFR Part 11-compliant software suite supporting electronic signatures, audit trails, and role-based access control (four privilege levels, five distinct user accounts)
• Automated data logging: stores up to 500 measurement records internally, each timestamped and annotated with operator ID, sample ID, temperature, and selected scale
• Flexible scale configuration: supports definition of up to 100 custom calibration curves using two-point or multi-point input (refractive index vs. known concentration)
• Preloaded reference curves for 23 common substances—including glucose, fructose, sodium chloride, ethylene glycol, glycerol, and ethanol—enabling rapid deployment without manual curve generation
• Smart self-diagnostic function continuously monitors prism surface cleanliness, optical signal intensity, and spectral consistency to flag potential measurement drift before it affects data integrity
• Manual calibration mode allows fine-tuning against certified reference standards (e.g., distilled water, sucrose solutions) to maintain long-term accuracy alignment across instrument fleets

Sample Compatibility & Compliance

The RX-5000i accommodates liquid, semi-liquid, and low-viscosity paste samples (up to ~10,000 mPa·s) via standard 0.5 mL micro-dosing onto the sapphire prism. Its wide Brix range (0.00–100.00%) and high-resolution n_D capability (1.32000–1.58000, typical for aqueous and organic systems) support applications from fruit juice and dairy processing to essential oil QC and polymer solution characterization. All firmware and data management functions adhere to GLP and GMP documentation requirements. The embedded software satisfies FDA 21 CFR Part 11 criteria for electronic records and signatures, including mandatory features: secure user authentication, immutable audit logs, and configurable retention policies. Instrument validation documentation (IQ/OQ/PQ templates) is available upon request to support laboratory accreditation under ISO/IEC 17025.

Software & Data Management

Data export is supported via USB mass storage mode (direct print to compatible thermal printers) and RS-232C serial communication (ASCII protocol) for integration into LIMS or MES platforms. The onboard software enables real-time statistical evaluation (mean, SD, CV%), pass/fail limit setting with visual alerts, and batch report generation. All measurement events—including calibration actions, user logins, and parameter changes—are recorded with full metadata in a tamper-evident audit trail. Exported CSV files retain complete traceability: date/time stamp, operator code, sample identifier, measured value, temperature, selected scale, and instrument serial number. No cloud connectivity or remote access functionality is implemented—ensuring data sovereignty and network isolation per IT security policy requirements.

Applications

• Food & Beverage: Brix quantification in soft drinks, jams, honey, wine must, and plant-based milk alternatives; consistency control during concentration and blending operations
• Pharmaceuticals: Excipient concentration verification (e.g., dextrose, mannitol), syrup density monitoring, and raw material identity testing per USP
• Chemical Manufacturing: Glycol content in antifreeze formulations, acid/base concentration tracking in etchants, and solvent purity screening
• Academic Research: Refractive index–concentration modeling for binary and ternary systems; temperature-dependent solubility studies
• Industrial Lubricants & Coatings: Water contamination detection in hydraulic oils and resin solids content estimation

FAQ

Does the RX-5000i include built-in temperature control?
Yes—the instrument integrates a Peltier thermoelectric module that actively regulates prism temperature within ±0.1 °C of setpoint, enabling precise thermal compensation without external chillers or baths.
Can I generate custom calibration curves for proprietary formulations?
Absolutely. Using the “Create Scale” function, users can define up to 100 unique scales by entering paired n_D/concentration values from reference standards or validated HPLC/GC data.
Is audit trail data exportable in a regulatory-submission-ready format?
Yes—audit logs are stored internally and exportable as encrypted CSV files containing all required 21 CFR Part 11 elements: user ID, timestamp, action type, pre-change/post-change values, and digital signature metadata.
What maintenance is required to sustain measurement accuracy?
Daily prism cleaning with lens-grade tissue and recommended ATAGO cleaning solution; quarterly verification using NIST-traceable sucrose standards; annual factory recalibration recommended for ISO/IEC 17025 compliance.
How does the self-diagnostic system improve measurement reliability?
It performs real-time optical path integrity checks—including prism fouling detection via reflected light intensity variance and wavelength stability assessment—to preemptively alert operators prior to nonconforming results.