ATAGO RX-5000α Desktop Refractometer for Disinfectant Solution Concentration Measurement

Overview

The ATAGO RX-5000α is a high-precision benchtop refractometer engineered for accurate, repeatable concentration measurement of aqueous disinfectant solutions—such as sodium hypochlorite, hydrogen peroxide, quaternary ammonium compounds, and alkali-based sanitizers—via the principle of critical-angle refractometry. Operating on the fundamental optical relationship between refractive index (n_D) and solute concentration, the instrument delivers traceable, temperature-compensated measurements under controlled thermal conditions. Its integrated Peltier-based temperature control system ensures sample equilibration within ±0.05°C across a programmable range of 5.00–60.00°C, eliminating ambient drift and enabling compliance with standardized test protocols requiring strict thermal management (e.g., ASTM D1218, ISO 21748). Designed for routine QC laboratories in regulated environments, the RX-5000α supports both refractive index (n_D) and Brix (% w/w sucrose-equivalent) readouts, with dual-scale calibration capability essential for non-sugar disinfectants where empirical correlation curves are established and validated.

Key Features

• Peltier-driven automatic temperature control (ATC) with real-time monitoring and stability verification, ensuring measurement repeatability independent of laboratory ambient fluctuations
• Synthetic sapphire prism and SUS316 stainless steel sample stage—chemically inert, corrosion-resistant, and compatible with aggressive oxidizing agents and caustic solutions
• High-resolution optical detection system delivering n_D resolution of 0.00001 and accuracy of ±0.00004, meeting metrological requirements for analytical-grade concentration verification
• Simultaneous dual-parameter output: refractive index (n_D) and Brix, with optional user-defined scale programming for custom disinfectant-specific calibration tables (up to 60 stored profiles)
• RS-232C serial interface compliant with legacy lab automation infrastructure; supports direct data logging to LIMS or SCADA systems without proprietary drivers
• Compliance-ready design: audit trail-capable firmware architecture (when paired with ATAGO’s optional data acquisition software), supporting 21 CFR Part 11-aligned electronic record practices including user authentication and change logging

Sample Compatibility & Compliance

The RX-5000α is validated for use with low-viscosity, optically clear aqueous disinfectant formulations—including hypochlorite, peracetic acid, ethanol/isopropanol blends, and sodium hydroxide solutions—provided they do not contain suspended solids or emulsified oils that interfere with light transmission. Its ATC function aligns with ISO 21748:2017 guidelines for temperature-controlled refractometric analysis and supports internal method validation per ICH Q2(R2) principles. In pharmaceutical manufacturing, the instrument facilitates adherence to EU GMP Annex 1 and USP “Refractometry” requirements for environmental monitoring solution verification. For food processing facilities operating under FDA Food Safety Modernization Act (FSMA) preventive controls, the RX-5000α enables documented, calibrated verification of sanitizer concentrations prior to equipment contact—directly supporting hazard analysis and critical control point (HACCP) records.

Software & Data Management

While the RX-5000α operates as a standalone instrument, its RS-232C port enables integration with ATAGO’s optional PC-based software suite (ReflaX™), which provides GLP-compliant data capture, calibration history tracking, statistical process control (SPC) charting, and PDF report generation. All measurement events—including operator ID, timestamp, temperature setpoint, measured n_D/Brix, and calibration status—are logged with immutable timestamps. When deployed in validated environments, the system supports electronic signature workflows and export to CSV or XML formats compatible with enterprise quality management systems (QMS). No cloud connectivity or external internet dependency is required—data sovereignty and network segmentation integrity are preserved by default.

Applications

• Pre-use verification of disinfectant concentration in pharmaceutical cleanrooms and aseptic processing suites
• In-process concentration monitoring during industrial-scale formulation of hospital-grade disinfectants
• Final product release testing per internal specifications or regulatory monographs (e.g., EPA List N, EN 13697)
• Validation of automated CIP (clean-in-place) chemical dosing systems via periodic manual spot-checking
• Method transfer support for pharmacopeial assays requiring refractive index as a surrogate for active ingredient strength
• Research and development of novel biocidal formulations where rapid, non-destructive concentration screening accelerates stability studies

FAQ

Does the RX-5000α require daily recalibration?
No—calibration frequency is determined by risk-based assessment per ISO/IEC 17025. ATAGO recommends initial calibration with certified NIST-traceable standards (e.g., distilled water and sucrose reference solutions), followed by verification checks at start/end of shift in high-throughput labs or before each batch in GMP settings.
Can it measure undiluted sodium hypochlorite (12–15%)?
Yes—the 1.32700–1.58000 n_D range fully covers concentrated bleach solutions; however, users must validate linearity and recovery against titrimetric reference methods for their specific formulation due to potential deviations from ideal sucrose-based Brix correlation.
Is the instrument suitable for ISO 17025-accredited testing laboratories?
Yes—when operated with documented procedures, traceable standards, and maintained calibration records, the RX-5000α meets the metrological requirements for accredited concentration testing of liquid disinfectants under ISO/IEC 17025:2017 clause 6.4 (Equipment).