ATAGO RX-9000α Desktop Digital Automatic Refractometer

Overview

The ATAGO RX-9000α is a high-precision benchtop digital automatic refractometer engineered for rapid, repeatable determination of refractive index and derived concentration values (e.g., Brix, % w/w, % w/v, nD) in liquid and semi-liquid samples. It operates on the principle of total internal reflection at the prism–sample interface, where incident light undergoes critical angle shift proportional to the sample’s refractive index. This optical measurement is converted into digital concentration output via factory-calibrated algorithms traceable to NIST-standard sucrose solutions. Designed for routine quality control laboratories in food & beverage, pharmaceutical, chemical, and academic research settings, the RX-9000α delivers robust performance without integrated temperature regulation—making it suitable for ambient-stable applications or environments where external thermostatic control is implemented independently.

Key Features

• Full automation: One-touch measurement initiation with auto-sampling detection and instantaneous result display
• Digital LCD interface with intuitive menu navigation and multilingual support (English, Japanese, Chinese, Korean)
• High-resolution optical system featuring sapphire prism and LED light source with >50,000-hour service life
• Measurement repeatability of ≤±0.02% under controlled ambient conditions (20–25°C, <60% RH)
• Internal memory stores up to 1,000 measurement records with timestamp, operator ID, and calibration history
• RS-232 and USB-B ports for direct data export to LIMS or Excel-compatible software; optional Ethernet module available
• Compliance-ready architecture supporting audit trails, user-level access control (admin/operator), and calibration lockout functions

Sample Compatibility & Compliance

The RX-9000α accommodates aqueous solutions, syrups, juices, dairy products, saline solutions, glycols, and many organic solvents—provided they are optically clear and non-corrosive to sapphire. Viscous or particulate-laden samples require pre-filtration or dilution. While the instrument lacks built-in Peltier temperature control, its optical design minimizes thermal drift through low-power LED illumination and thermally stable prism housing. It meets fundamental requirements of ISO 21748:2017 (Refractometry — Guidance for the use of refractometers) and aligns with JIS K 0061 for industrial refractive index measurement methodology. For regulated environments (e.g., FDA-regulated manufacturing), the device supports 21 CFR Part 11 compliance when paired with ATAGO’s certified PC software (ReflactoLink v4.2), enabling electronic signatures, audit trail generation, and secure calibration management.

Software & Data Management

ReflactoLink PC software (sold separately) enables full instrument control, method library creation, statistical process monitoring (SPC), and automated report generation (PDF/CSV). All measurements include embedded metadata: date/time stamp, user login, calibration status flag, and raw refractive index value. Data export protocols comply with ASTM E2500-18 (Standard Guide for Specification, Design, and Verification of Pharmaceutical and Biopharmaceutical Manufacturing Systems) for traceability. The instrument’s firmware supports over-the-air updates via USB drive, ensuring long-term compatibility with evolving laboratory informatics standards.

Applications

• Food & Beverage: Brix verification in fruit juices, soft drinks, jams, honey, and dairy concentrates
• Pharmaceuticals: Excipient concentration checks (e.g., glycerin, propylene glycol), syrup formulation QC
• Chemicals: Ethanol/water mixture analysis, antifreeze glycol concentration, cleaning solution strength verification
• Academic Research: Teaching labs for optical property studies; kinetics monitoring in transparent reaction systems
• Quality Assurance: In-process testing for consistency across batch production lines

FAQ

Does the RX-9000α include temperature compensation?
No—the RX-9000α does not feature integrated temperature control or automatic temperature compensation (ATC). Users must maintain ambient laboratory temperature within ±1°C of calibration reference (typically 20°C or 25°C) or apply manual correction using published temperature–refractive index coefficients.
Can it measure non-aqueous samples like oils or solvents?
Yes, provided the sample is optically transparent and does not etch sapphire (e.g., avoid hydrofluoric acid, hot concentrated alkalis). Refractive index ranges outside 1.32–1.56 may yield reduced linearity; consult ATAGO’s application notes for extended range validation.
Is GMP/GLP documentation available?
Yes—ATAGO provides IQ/OQ documentation packages, calibration certificates traceable to NMIJ (National Metrology Institute of Japan), and a full set of SOP templates compliant with ISO/IEC 17025 and WHO TRS 961 Annex 4 requirements.
What maintenance is required?
Daily prism cleaning with lens tissue and ethanol; quarterly verification using certified sucrose standards; annual recalibration recommended by an accredited service center.
How is user access managed for regulated workflows?
The instrument supports three-tier password protection (Admin, Supervisor, Operator) and logs all critical actions—including calibration edits, method changes, and data deletion—with immutable timestamps.