A.KRÜSS DR6000 Digital Refractometer
| Brand | A.KRÜSS / A.KRÜSS Optronic |
|---|---|
| Origin | Germany |
| Model | DR6000 |
| Product Type | Benchtop Refractometer |
| Temperature Control | Peltier-based, 10–80 °C (±0.1 °C) |
| Digital Display | Yes |
| Refractive Index Range | nD 1.3200–1.5800 (standard), up to 1.7000 with extended Brix mode |
| Accuracy | ±0.0001 nD |
| Resolution | 0.0001 nD |
| Brix Range | 0–95 % |
| Brix Accuracy | ±0.1 % |
| Brix Resolution | 0.1 % |
| Prism Material | Sapphire |
| Light Source | 590 nm LED (>100,000 h lifetime) |
| Measurement Time | ~4 s |
| Interface | RS-232, USB, Ethernet |
| Data Storage | Integrated SQL database (99 methods, 999 results) |
| Compliance | GLP, FDA 21 CFR Part 11 ready, ICUMSA-compliant temperature compensation |
| IP Rating | IP65 (measurement cell) |
| Power Supply | 90–260 V AC, 50/60 Hz, 60 W |
| Operating Ambient | 15–35 °C |
| Sample Temp Range | 10–80 °C |
| Temperature Sensor | PT100 |
| Display | 5.7″ LCD (320 × 240 px), touchscreen |
Overview
The A.KRÜSS DR6000 Digital Refractometer is a high-precision benchtop instrument engineered for accurate, repeatable refractive index (nD) and %Brix measurements across demanding industrial and quality control environments. It operates on the principle of total internal reflection at the prism–sample interface, using a monochromatic 590 nm LED light source and sapphire prism optics to deliver stable optical performance over extended service life. Unlike traditional Abbe-type refractometers requiring manual interpolation or water-bath thermal equilibration, the DR6000 integrates a solid-state Peltier temperature controller—enabling rapid, precise sample temperature regulation from 10 °C to 80 °C with ±0.1 °C accuracy and ≤0.05 °C stability. This eliminates thermal drift as a major source of measurement uncertainty and ensures compliance with ISO 21744:2018 (Refractometry — General principles) and ASTM D1218 (Standard Test Method for Refractive Index of Hydrocarbon Liquids). The instrument delivers measurement results in approximately four seconds per sample, independent of turbidity, color, or suspended solids—making it suitable for raw, unfiltered process streams in food, chemical, and wastewater applications.
Key Features
- High-resolution sapphire prism with >100,000-hour LED illumination (590 nm), ensuring long-term photometric stability and minimal calibration drift
- Integrated Peltier temperature control system with real-time PT100 sensing, enabling automatic temperature compensation per ICUMSA-defined curves or user-defined 3-point profiles
- Touchscreen-driven 5.7″ LCD interface (320 × 240 px) with intuitive workflow navigation and multilingual OS support
- Built-in SQL database supporting up to 99 user-defined measurement methods and 999 result entries, each timestamped and annotated with operator ID, sample ID, and environmental metadata
- Full GLP/GMP traceability: audit trail logging, electronic signatures (with optional user management module), and FDA 21 CFR Part 11–compliant data export
- Robust cast-aluminum housing with IP65-rated measurement cell, stainless-steel sample stage, and corrosion-resistant fluid pathways
- Multi-interface connectivity: RS-232, USB host/device, and Ethernet (TCP/IP), enabling direct integration into LIMS, SCADA, or MES platforms
- Optional high-throughput accessories—including flow cells (DR6000-F), thermally stabilized cuvettes (DR6000-T), and combined flow/temperature modules (DR6000-FT)—for automated inline or sequential batch analysis
Sample Compatibility & Compliance
The DR6000 accommodates a broad spectrum of liquid and semi-liquid samples without pre-filtration or dilution: aqueous sugar solutions, polymer emulsions, organic solvents, acid/base electrolytes, food slurries, and industrial coolants. Its immunity to optical interference from color and turbidity stems from fixed-wavelength detection and optimized signal-to-noise ratio processing—not empirical correction algorithms. All models meet CE marking requirements and are designed to support regulatory validation under ISO/IEC 17025, USP , and EU GMP Annex 11. The integrated temperature compensation engine supports ICUMSA-standard sucrose tables and allows custom calibration for non-sugar analytes (e.g., glycols, ethanol–water mixtures) via user-defined refractive index vs. concentration polynomials. Optional external Peltier controllers (e.g., PT31) extend compatibility to legacy or non-thermostatted configurations.
Software & Data Management
Data integrity and interoperability are foundational to the DR6000’s architecture. Raw and processed results—including nD, %Brix, temperature, method ID, operator credentials, and measurement timestamps—are stored in an embedded relational SQL database. Export is supported in CSV and XLS formats via USB flash drive, preserving column headers and metadata for seamless ingestion into statistical process control (SPC) software or laboratory information management systems (LIMS). Remote diagnostics and firmware updates are enabled over Ethernet using secure HTTP/S protocols; no proprietary client software is required. For regulated environments, the optional User Management Module enforces role-based access control (RBAC), session locking, and electronic signature workflows aligned with FDA 21 CFR Part 11 Subpart C requirements. Audit logs record all configuration changes, calibration events, and data exports with immutable timestamps.
Applications
The DR6000 serves as a primary QC tool across industries where concentration, purity, or formulation consistency must be verified rapidly and non-destructively. In beverage and sugar production, it quantifies dissolved solids in fruit juices, syrups, and molasses per AOAC 932.12 and ICUMSA GS4/3-14. In pharmaceutical manufacturing, it verifies excipient concentrations in oral suspensions and ophthalmic solutions per USP . In pulp and paper mills, it monitors caustic soda strength in white liquor and hemicellulose content in black liquor. Chemical plants deploy it for real-time monitoring of ethylene glycol antifreeze blends, surfactant micelle formation thresholds, and catalyst precursor concentrations. Additional validated use cases include metalworking fluid concentration (ISO 6743-11), biodiesel blend verification (ASTM D6751), and wastewater TDS estimation in municipal treatment facilities.
FAQ
Does the DR6000 require daily recalibration?
No. With stable sapphire optics and temperature-controlled measurement, the DR6000 maintains calibration for ≥72 hours under routine operation. Daily verification using certified NIST-traceable standards (e.g., distilled water at 20 °C, nD = 1.3330) is recommended per ISO/IEC 17025 Clause 7.7.
Can the instrument measure non-aqueous samples like hydrocarbons or solvents?
Yes—provided the sample wets the sapphire prism and remains within the nD 1.3200–1.7000 range. Volatile or highly corrosive liquids (e.g., concentrated HNO3) require specialized handling protocols and optional chemical-resistant prism coatings.
Is remote software update supported without physical access?
Yes. Firmware updates and configuration backups can be performed over Ethernet using standard web browser interfaces; no local PC installation is required.
What temperature compensation standards are built-in?
ICUMSA sucrose tables (GS4/3-14), as well as user-configurable 3-point polynomial compensation for custom analytes.
How is data security ensured during network transmission?
All Ethernet communications use TLS 1.2 encryption; login sessions time out after 15 minutes of inactivity, and password policies enforce minimum length and complexity requirements when the User Management Module is activated.
