ATAGO PRM-100α DX High-Precision Online Refractometer

Overview

The ATAGO PRM-100α DX High-Precision Online Refractometer is an industrial-grade, real-time refractive index analyzer engineered for continuous, non-invasive concentration monitoring in liquid process streams. Based on the fundamental optical principle of total internal reflection at the prism-liquid interface, the instrument measures the critical angle of incident light to determine the refractive index (n_D) with high repeatability and long-term stability. This physical property correlates directly with solute concentration in homogeneous aqueous solutions—enabling accurate, calibration-free determination of Brix (% w/w sucrose equivalent), mass concentration (g/100 g), and temperature-compensated refractive index across a broad range of process conditions. Designed for integration into clean-in-place (CIP), dilution, blending, and sterilization loops, the PRM-100α DX delivers real-time feedback without sampling, bypass lines, or reagent consumption—reducing analytical lag time and minimizing operator intervention.

Key Features

• High-resolution optical detection system delivering ±0.00010 refractive index accuracy and ±0.05% Brix precision under stable thermal conditions
• Integrated Pt1000 RTD sensor for simultaneous temperature measurement and automatic compensation across 5.0–100.0°C
• Compact, corrosion-resistant stainless-steel wetted parts (316L contact surface) rated for IP67 ingress protection and compatible with CIP/SIP protocols
• Dual-output interface: isolated 4–20 mA analog signal for PLC/DCS integration and RS-232C serial communication for configuration, diagnostics, and data logging
• Modular architecture separating the flow-through sensor head from the remote display/controller unit, supporting cable lengths up to 200 meters via RS-485 protocol
• Configurable upper/lower limit alarms with relay output for immediate process deviation notification and automated interlock triggering

Sample Compatibility & Compliance

The PRM-100α DX is validated for use with clear, low-turbidity aqueous solutions including sugar syrups, fruit juices, dairy concentrates, pharmaceutical buffers, cleaning agents (e.g., NaOH, HNO₃, citric acid), and coolant emulsions. It is not intended for highly viscous, opaque, or particulate-laden fluids requiring inline filtration. The instrument conforms to IEC 61000-6-2 (EMC immunity) and IEC 61000-6-4 (EMC emission) standards. Its design supports alignment with Good Manufacturing Practice (GMP) and FDA 21 CFR Part 11 requirements when deployed with audit-trail-capable SCADA or MES systems; full traceability is enabled through timestamped digital output and configurable data logging intervals. Calibration verification procedures align with ASTM D1218 and ISO 21542 for refractometric analysis in process environments.

Software & Data Management

The PRM-100α DX operates as a standalone field device but integrates seamlessly with industry-standard control platforms via Modbus RTU over RS-485 (optional firmware upgrade). Local configuration is performed using the built-in keypad and LCD interface, supporting unit selection (n_D, Brix, % w/w), alarm thresholds, damping filters, and temperature compensation curve selection. For centralized monitoring, ATAGO provides optional PC-based software (RefractoLink™) that enables real-time trend visualization, batch reporting, CSV export, and historical comparison against reference laboratory measurements. All stored data include embedded timestamps, sensor ID, and environmental metadata—facilitating compliance with GLP documentation workflows and internal quality audits.

Applications

• Continuous Brix control during juice concentration, syrup blending, and fermentation broth monitoring in beverage and dairy production
• In-line concentration verification of active pharmaceutical ingredients (APIs) and excipients in buffer preparation and sterile filtration skids
• Real-time tracking of cleaning solution strength in CIP systems to ensure validated removal of organic residues
• Monitoring of glycol-based heat transfer fluids and coolant concentrations in metalworking and semiconductor fabrication facilities
• Concentration feedback control for polymer emulsion synthesis and latex coagulation processes
• Quality gate validation for incoming raw material solutions prior to storage or further processing

FAQ

What is the maximum allowable suspended solids content for reliable measurement?
The sensor requires optically clear media; turbidity should remain below 1 NTU. Applications involving particulates necessitate upstream filtration (e.g., 5 µm cartridge filter) and regular prism cleaning protocols.
Can the PRM-100α DX be installed in pressurized pipelines?
Yes—it supports static line pressures up to 10 bar (145 psi) at 25°C when mounted with appropriate sanitary tri-clamp or DIN 11851 fittings.
Is factory calibration traceable to NIST or JCSS standards?
Each unit ships with a Certificate of Conformance referencing ATAGO’s internal metrology lab, which maintains traceability to JCSS-accredited refractive index standards; NIST-traceable calibration certificates are available upon request.
How often does the instrument require recalibration during continuous operation?
Under stable process conditions and proper maintenance, recalibration is recommended every 6–12 months—or following any mechanical impact, prism contamination, or significant change in fluid composition.
Does the device support hazardous area installation?
The standard PRM-100α DX is rated for general-purpose environments; ATEX/IECEx-certified versions (e.g., PRM-100α DX-EX) are available for Zone 1/21 applications with intrinsic safety barriers.