Metash MWD-520 Sealed Intelligent Microwave Digestion System
| Brand | Metash Instruments |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Original Equipment Manufacturer (OEM) |
| Product Category | Domestic |
| Model | MWD-520 |
| Price Range | USD 21,000 – 28,000 |
| Cavity Class | Industrial-Grade |
| Sample Capacity | 6/8/10 positions (selectable) |
| Microwave Source | Single Magnetron |
| Max Temperature | 250 °C |
| Max Pressure | 6 MPa |
| Microwave Power Output | 0–1000 W |
| Display | 7-inch capacitive touchscreen |
| Dimensions (W×D×H) | 490 × 560 × 533 mm |
| Inner Vessel Volume | 100 mL |
| Inner Vessel Material | Imported TFM (modified PTFE) |
| Outer Vessel Material | PEEK-glass fiber composite |
| Temperature Control | Non-contact mid-infrared full-vessel scanning (0.1 °C resolution) |
| Pressure Control | Multi-channel optical fiber pressure scanning |
| Cooling System | Turbulent airflow cooling (≤90 °C in ≤8 min) |
Overview
The Metash MWD-520 Sealed Intelligent Microwave Digestion System is an industrial-grade sample preparation platform engineered for high-throughput, reproducible, and fully traceable acid digestion of solid and semi-solid matrices in environmental, geological, food safety, clinical, and regulatory laboratories. It operates on the principle of controlled microwave energy absorption by polar molecules—primarily HNO₃, HCl, HF, and H₂O—within sealed quartz or fluoropolymer vessels, enabling rapid thermal decomposition under elevated temperature and pressure. Unlike pulsed microwave systems, the MWD-520 employs continuous, non-pulsed microwave generation with real-time power modulation, ensuring stable energy delivery and minimizing thermal overshoot. Its compact multimode cavity—optimized via electromagnetic field simulation—delivers uniform electric field distribution across all vessel positions, eliminating localized hot/cold spots and significantly improving inter-vessel temperature homogeneity (<±1.5 °C at 220 °C). Designed to meet ISO/IEC 17025 pre-analytical requirements and support GLP/GMP workflows, the system integrates hardware-level safety redundancies with software-based audit trail capabilities.
Key Features
- Industrial-grade 316L stainless steel chassis with multi-layer internal PFA coating—resistant to corrosion from aggressive acids (e.g., aqua regia, hydrofluoric acid) and mechanical impact during routine handling.
- Non-contact mid-infrared (MIR) bottom-scanning temperature monitoring: optical sensors penetrate the outer PEEK/TFM vessel stack to measure actual solution temperature—not vessel wall temperature—with 0.1 °C resolution and no interference from microwave fields.
- Multi-channel optical fiber pressure sensing array: each digestion vessel is independently monitored in real time; microprocessor-triggered microwave cutoff occurs within <100 ms upon detection of pressure exceeding user-defined thresholds.
- Self-recovering dual-pressure relief architecture: eliminates consumable components (e.g., burst discs, sealing bowls); pressure release occurs vertically through vent holes in the base of the outer vessel, minimizing lateral force transmission during overpressure events.
- Turbulent forced-air cooling system reduces post-digestion cavity temperature to ≤90 °C within 8 minutes—reducing turnaround time between runs without compromising vessel integrity or operator safety.
- Modular rotor configuration supports interchangeable 6-, 8-, and 10-position turntables—enabling method scalability from R&D validation to routine QA/QC batch processing.
Sample Compatibility & Compliance
The MWD-520 accommodates a broad range of sample types—including soils, sediments, biological tissues, polymers, pharmaceutical excipients, and metal alloys—when paired with appropriate acid mixtures (e.g., HNO₃/HF for silicates; HNO₃/H₂O₂ for organics). All vessel materials comply with USP Class VI biocompatibility standards and are certified free of extractables per ASTM D4292. The system meets IEC 61000-4-3 (radiated immunity) and IEC 61000-4-6 (conducted immunity) for electromagnetic compatibility. Safety design conforms to IEC 61010-1 (Laboratory Equipment Safety) and includes dual-interlocked door switches, emergency power-off circuitry, and microwave leakage <1 mW/cm² at 5 cm (well below EN 60705 limit of 5 mW/cm²). Full compliance documentation—including Factory Acceptance Test (FAT) reports and material certifications—is provided with each unit.
Software & Data Management
The embedded 7-inch capacitive touchscreen interface runs Metash DigControl™ v3.2 firmware, supporting up to 99 customizable digestion methods with stepwise ramp-hold-cool profiles. All temperature, pressure, and power data are timestamped and stored locally with optional USB export in CSV or PDF report formats. Audit trail functionality records user login/logout events, method edits, run executions, and alarm triggers—fully compliant with FDA 21 CFR Part 11 requirements when deployed with networked authentication and electronic signature modules. Remote monitoring via Ethernet or optional Wi-Fi enables integration into LIMS environments using standard OPC UA or Modbus TCP protocols.
Applications
- Environmental testing: EPA Methods 3051A, 3052, and 3015A for heavy metal extraction from soils, sludges, and airborne particulates.
- Clinical & forensic toxicology: digestion of hair, nails, and tissue samples prior to ICP-MS analysis of As, Cd, Pb, and Hg.
- Food and feed safety: determination of nutrient elements (Ca, Mg, Fe, Zn) and contaminants (Al, Sn, Cr) per AOAC 999.10 and ISO 11885.
- Geological exploration: total digestion of silicate rocks and ores using HF-containing reagents under ISO 14869-1 conditions.
- Pharmaceutical quality control: residual catalyst metal quantification (Pd, Pt, Rh) in active pharmaceutical ingredients (APIs) per USP <232> and <233>.
FAQ
What safety certifications does the MWD-520 hold?
The system complies with IEC 61010-1 for laboratory equipment safety, IEC 61000-4-3/6 for EMC, and meets EN 60705 limits for microwave leakage. Full test reports are available upon request.
Can the MWD-520 be integrated into a LIMS environment?
Yes—via Ethernet or optional Wi-Fi using OPC UA or Modbus TCP protocols. Audit trail logs support 21 CFR Part 11 compliance when configured with network authentication.
Is HF digestion supported?
Yes—the TFM inner vessels and PEEK-glass fiber outer vessels are chemically resistant to hydrofluoric acid up to 250 °C and 6 MPa, provided proper procedural controls are followed.
How is temperature measured without sensor contact?
Mid-infrared optics mounted beneath the rotor detect thermal emission directly from the digestate surface through the transparent TFM inner vessel and PEEK outer vessel—eliminating thermal lag and wall-effect errors.
What maintenance is required for long-term reliability?
No routine calibration is needed for the optical temperature/pressure sensors. Annual verification of door interlocks, cooling fan performance, and magnetron output stability is recommended per ISO/IEC 17025 preventive maintenance guidelines.
