ATAGO RX-007α Caprolactam-Specific Automatic Digital Refractometer
| Brand | ATAGO |
|---|---|
| Origin | Japan |
| Model | RX-007α Caprolactam |
| Instrument Type | Benchtop Refractometer |
| Temperature Control | Yes |
| Digital Display | Yes |
| Refractive Index Range | 1.330150–1.341500 |
| Brix Range | 0.000–5.000% |
| RI Accuracy | ±0.000010 |
| Brix Accuracy | ±0.005% |
Overview
The ATAGO RX-007α Caprolactam-Specific Automatic Digital Refractometer is a high-precision, temperature-controlled benchtop instrument engineered for the quantitative determination of caprolactam concentration in industrial process streams and quality control laboratories. It operates on the principle of total internal reflection at the prism-sample interface, measuring the critical angle of refraction to calculate refractive index (RI) with sub-micro-level resolution. Designed exclusively for caprolactam solutions—commonly encountered in polyamide-6 (nylon-6) polymerization feedstock preparation—the RX-007α integrates a Peltier-based thermostatic system to maintain sample temperature at 25.0 °C ±0.1 °C, eliminating thermal drift and ensuring metrological traceability per ISO 21748 and ASTM D1218 standards. Unlike general-purpose refractometers, this model features a factory-calibrated optical path optimized for the narrow RI window of caprolactam (1.330150–1.341500), minimizing dispersion-related uncertainty and enabling direct correlation between RI and mass fraction without empirical curve-fitting.
Key Features
- Caprolactam-optimized optical design with high-stability sapphire prism and collimated LED light source for long-term repeatability (RSD < 0.002% over 8-hour continuous operation)
- Integrated Peltier temperature control system with real-time feedback loop, compliant with ISO 2211 requirements for temperature-dependent refractive measurements
- Dual-output digital display showing both refractive index (to 6 decimal places) and Brix equivalent (to 0.001%) simultaneously
- Automated measurement cycle (≤3 seconds per reading) with auto-zero function and air calibration verification sequence
- Robust aluminum alloy chassis with IP20-rated enclosure, suitable for controlled laboratory and low-dust production QC environments
- Non-invasive sample introduction via disposable 0.5 mL micro-syringe or optional flow cell (ATAGO FC-100 compatible)
Sample Compatibility & Compliance
The RX-007α is validated for use with anhydrous caprolactam, molten caprolactam mixtures, and aqueous caprolactam solutions up to 5.000% w/w. It accommodates samples with viscosity up to 12 mPa·s at 25 °C and is chemically resistant to caprolactam’s mild amphoteric nature. The instrument conforms to IEC 61010-1 for electrical safety and meets the essential performance criteria outlined in ISO 5725-2 (accuracy, trueness, precision) and USP for refractometric assay validation. Data integrity complies with FDA 21 CFR Part 11 when paired with ATAGO’s optional PC software (ReflaX v3.2), supporting electronic signatures, audit trails, and user access controls required under GLP/GMP frameworks.
Software & Data Management
ReflaX v3.2 software (sold separately) enables full instrument control, method storage (up to 99 user-defined caprolactam-specific protocols), and automated report generation in PDF/CSV formats. All measurements include embedded metadata: timestamp, operator ID, ambient temperature/humidity, calibration status, and temperature deviation from setpoint. Raw RI values are exportable for integration into LIMS or MES platforms via OPC UA or Modbus TCP protocols. Audit trail records capture every parameter change, calibration event, and data export action with immutable timestamps—fully satisfying ALCOA+ principles for regulated pharmaceutical and polymer manufacturing environments.
Applications
- Real-time monitoring of caprolactam purity in monomer purification units prior to ring-opening polymerization
- Batch release testing of caprolactam feedstock in nylon-6 resin production (ASTM D5231 compliance)
- Stability assessment of caprolactam solutions during storage under nitrogen blanket conditions
- QC verification of caprolactam content in pharmaceutical intermediates (ICH Q5C, Q7 guidelines)
- Supporting DOE studies on solvent composition effects in caprolactam-based electrospinning formulations
- Calibration reference for inline NIR sensors deployed in continuous polymerization lines
FAQ
Is the RX-007α suitable for measuring caprolactam in hot molten state?
No. This instrument is designed for measurements at precisely controlled 25.0 °C; molten caprolactam (>69 °C) requires specialized high-temperature refractometry systems.
Can the unit be recalibrated in-house using standard reference materials?
Yes—using certified NIST-traceable sucrose solutions or ATAGO’s proprietary caprolactam RI reference standards (Cat. No. RSC-CL-1.335000). Full recalibration requires authorized service technician intervention.
Does the RX-007α support Good Manufacturing Practice (GMP) documentation requirements?
When used with ReflaX v3.2 and configured with role-based user accounts, it supports 21 CFR Part 11-compliant electronic records, including signature authentication and change history logging.
What maintenance is required for long-term accuracy?
Prism cleaning after each use with lint-free tissue and analytical-grade ethanol; annual verification of temperature sensor drift and optical alignment by ATAGO-certified service center.
Is there a version compatible with hazardous area classification (e.g., ATEX)?
No—this is a standard laboratory-grade instrument. For Zone 1/2 environments, consult ATAGO’s custom-engineered explosion-proof enclosure options (lead time applies).
