ATAGO RX-7000i Automatic Desktop Refractometer for Oils, Fragrances, and High-RI Organic Samples

Overview

The ATAGO RX-7000i is a high-precision, fully automated benchtop refractometer engineered for reliable measurement of refractive index (RI) and Brix in challenging samples with elevated refractive indices — including edible oils, essential oils, fragrance compounds, organic solvents, and high-melting-point lipid systems. Unlike conventional Abbe-type or handheld refractometers, the RX-7000i employs digital critical-angle detection via a temperature-stabilized sapphire prism interface and a high-stability LED light source, enabling traceable, repeatable measurements across an extended RI range (1.299800–1.715000). Its integrated Peltier thermoelectric module maintains sample temperature within ±0.1 °C across a programmable range of 5.00–75.00 °C — eliminating dependency on external water baths and ensuring compliance with temperature-sensitive test protocols such as ASTM D1218, ISO 28721-2, and USP . Designed for routine QC laboratories and R&D environments in flavor & fragrance, oleochemical, pharmaceutical excipient, and specialty chemical sectors, the instrument delivers metrological rigor without sacrificing operational efficiency.

Key Features

• Extended refractive index range (1.299800–1.715000) optimized for oils, terpenes, esters, and aromatic solvents that exceed the upper limits of standard refractometers
• Peltier-driven temperature control with real-time monitoring and user-selectable setpoints (5.00–75.00 °C), ensuring thermal equilibrium prior to measurement and minimizing drift
• Synthetic sapphire prism and SUS 316 stainless steel sample stage — chemically inert, scratch-resistant, and compatible with aggressive organic media
• High-resolution touchscreen interface with intuitive workflow navigation; no external PC required for basic operation
• Built-in library of 24 application-specific scales (e.g., soybean oil RI, limonene concentration, glycerin % w/w) and support for up to 100 user-defined calibration curves
• RS-232C serial interface for direct data export to LIMS, Excel, or statistical process control (SPC) software; optional FDA 21 CFR Part 11-compliant software available for audit-trail-enabled environments

Sample Compatibility & Compliance

The RX-7000i accommodates viscous, volatile, and thermally sensitive samples common in flavor chemistry and lipid science — including fixed oils (e.g., coconut, palm, castor), essential oils (e.g., bergamot, eucalyptus), synthetic fragrances (e.g., linalool, coumarin), and halogenated or aromatic solvents (e.g., chloroform, toluene). Its sealed sample chamber design minimizes evaporation during analysis, while the sapphire prism resists degradation from repeated exposure to ethanol, acetone, or limonene. The instrument meets mechanical and electrical safety requirements per IEC 61010-1 and supports quality system compliance in regulated settings: raw data integrity, electronic signature capability (via optional software), and configurable audit trails align with GLP, GMP, and FDA 21 CFR Part 11 expectations. It is routinely deployed in laboratories accredited to ISO/IEC 17025 for method validation of refractive index as a surrogate for purity, concentration, or compositional consistency.

Software & Data Management

While standalone operation is fully functional via the onboard interface, the RX-7000i supports seamless integration into laboratory informatics infrastructure. Through RS-232C, measurement records — including RI, Brix, temperature, timestamp, operator ID, and scale identifier — are transmitted in ASCII format for automated ingestion into LIMS or custom databases. Optional ATAGO Data Manager software provides full 21 CFR Part 11 functionality: role-based access control, electronic signatures, immutable audit logs, and secure data archiving. All calibration events, user modifications, and measurement sessions are time-stamped and traceable — satisfying regulatory documentation requirements for pharmaceutical intermediates, cosmetic actives, and food-grade emulsifiers.

Applications

• Quantification of triglyceride composition and adulteration screening in edible oils (e.g., detection of mineral oil dilution in olive oil)
• Batch release testing of fragrance concentrates and essential oil dilutions against specification limits
• Process monitoring of solvent recovery efficiency in extraction units (e.g., hexane residue in spent botanical extracts)
• Stability assessment of emulsions and microemulsions via refractive index shifts during phase separation
• Concentration verification of glycerol, propylene glycol, or polyethylene glycol solutions used as carriers in topical formulations
• Raw material identity testing per pharmacopeial monographs (e.g., Ph. Eur. general chapter 2.2.6 for refractive index of fixed oils)

FAQ

Does the RX-7000i require external cooling or heating equipment?

No — its built-in Peltier module enables precise, self-contained temperature regulation from 5.00 °C to 75.00 °C without auxiliary chillers or water baths.
Can it measure highly viscous samples like molten cocoa butter or hydrogenated tallow?

Yes — the wide RI range and robust sapphire/SUS 316 interface allow stable readings on semi-solid and high-viscosity oils above 40 °C, provided samples are homogenized and free of particulates.
Is calibration traceable to national standards?

Calibration is performed using NIST-traceable certified refractive index standards (e.g., ATAGO Standard Liquids SRM-1 through SRM-4), and certificates of calibration are available upon request.
How many users can be configured in the optional 21 CFR Part 11 software?

The software supports unlimited user accounts with customizable permission levels (e.g., analyst, supervisor, administrator) and dual electronic signature workflows for critical approvals.
What maintenance is required beyond routine prism cleaning?

No consumables or periodic recalibration are mandated; annual verification using reference standards is recommended for ISO/IEC 17025 compliance, and firmware updates are provided free of charge via ATAGO’s technical portal.