Anton Paar DMA 4200 M Oscillating U-Tube Density Meter
| Brand | Anton Paar |
|---|---|
| Origin | Austria |
| Model | DMA 4200 M |
| Instrument Type | Laboratory Benchtop Oscillating Tube Densitometer |
| Sample Type | Liquids |
| Density Range | 0–3 g/cm³ |
| Density Accuracy | ±0.0002 g/cm³ (at ambient pressure, ideal conditions) |
| Density Repeatability | ±0.00005 g/cm³ (std. dev., ISO 5725) |
| Density Reproducibility | ±0.0001 g/cm³ (std. dev., ISO 5725) |
| Density Resolution | 0.00001 g/cm³ |
| Temperature Range | –10 °C to +200 °C (14 °F to 392 °F) |
| Pressure Range | 0–500 bar (0–7250 psi) |
| Minimum Sample Volume | 2 mL |
| Temperature Accuracy | ±0.03 °C |
| Temperature Repeatability | ±0.01 °C |
| Viscosity Correction | Automatic, real-time, pressure- and temperature-compensated |
| Filling Verification | FillingCheck™ (ASTM D4052 / GB/T 29617 / ASTM D5002 compliant) |
| Thermal Equilibration Technology | Temperfect™ (enables immediate density measurement at any temperature from 0 °C to 150 °C under ambient pressure) |
| Excitation Method | Patented Pulsed Excitation Method (AT 516420 B1) |
| Cell Material | Hastelloy® C-276 |
| Dimensions | 510 mm × 330 mm × 380 mm (W × D × H) |
| Power Supply | AC 100–240 V, 50–60 Hz, 250 VA |
| Interfaces | 4× USB 2.0, 1× Ethernet (100 Mbit), 1× CAN Bus, 1× RS-232, 1× VGA |
| Wetted Parts | Hastelloy C-276 only |
| Compliance | ASTM D4052, ASTM D5002, GB/T 29617, ISO 12185, ISO 16554 |
Overview
The Anton Paar DMA 4200 M is a high-precision laboratory benchtop oscillating U-tube densimeter engineered for demanding density characterization of liquid samples under extreme thermal and pressure conditions. It operates on the fundamental principle of resonant frequency analysis: the sample-filled U-shaped glass tube is electromagnetically excited into oscillation, and its natural frequency—directly correlated to the sample’s density via the mass-spring system relationship—is measured with sub-microsecond timing resolution. This physical foundation ensures traceable, SI-based density determination without calibration drift or mechanical wear. Unlike traditional hydrometers or pycnometers, the DMA 4200 M delivers absolute density values in g/cm³ with metrological rigor, making it suitable for primary reference measurements in regulated environments. Its operational envelope spans –10 °C to +200 °C and 0–500 bar, enabling direct in-process density assessment of crude oils, heavy fractions, bitumens, and chemically aggressive fluids—including those containing H₂S, HCl, or HF—without degradation of sensor integrity.
Key Features
- Pulsed Excitation Method (patent AT 516420 B1): Eliminates damping-related inaccuracies by applying precisely timed electromagnetic pulses, ensuring stable resonance detection even for highly viscous or volatile samples.
- FillingCheck™: Real-time, optical-acoustic bubble detection verifies complete, void-free filling of the measuring cell—mandatory for compliance with ASTM D4052, ASTM D5002, and GB/T 29617.
- Temperfect™ technology: Achieves thermal equilibrium within seconds across the full 0–150 °C range at ambient pressure, enabling rapid sequential measurements without waiting for oven stabilization.
- Hastelloy® C-276 measuring cell: Chemically inert to strong acids, sour gases, and high-sulfur hydrocarbons—providing long-term stability and eliminating corrosion-induced measurement drift.
- Integrated viscosity correction: Applies dynamic, temperature- and pressure-dependent compensation algorithms to mitigate damping effects, maintaining accuracy up to ±0.0002 g/cm³ across kinematic viscosities up to 1000 mm²/s.
- Minimal sample requirement: Only 2 mL required per measurement—reducing solvent consumption, waste generation, and exposure risk during handling of hazardous or expensive materials.
Sample Compatibility & Compliance
The DMA 4200 M is validated for use with petroleum liquids (crude oil, distillates, residua, bitumen diluents), biofuels, lubricants, solvents, and process streams containing acidic or corrosive components. Its wetted-path construction—exclusively Hastelloy C-276—meets NACE MR0175/ISO 15156 requirements for sour service. Regulatory alignment includes full support for ASTM D4052 (standard test method for density of petroleum products), ASTM D5002 (for crude oils), and GB/T 29617 (Chinese national standard for digital density meters). Measurement uncertainty budgets are documented per ISO/IEC 17025 and traceable to PTB (Physikalisch-Technische Bundesanstalt) and NIST standards. Data integrity is maintained through audit-trail-enabled operation, satisfying GLP and FDA 21 CFR Part 11 requirements when paired with Anton Paar’s mPDS software.
Software & Data Management
Controlled via Anton Paar’s proprietary mPDS (Measurement and Process Data System) software, the DMA 4200 M supports fully automated workflows, including method-driven sequence programming, multi-parameter logging (density, temperature, pressure, viscosity index), and export to LIMS-compatible formats (CSV, XML, PDF). The software enforces electronic signatures, user access levels, and immutable audit trails—including timestamped operator actions, calibration events, and raw sensor data archives. All measurement records include metadata such as environmental chamber status, cell cleanliness flags, and FillingCheck™ verification logs. Network integration via Ethernet enables remote monitoring, centralized instrument fleet management, and secure data backup to on-premise or cloud-hosted servers.
Applications
- Upstream & midstream: Crude assay, PVT analysis, bubble point determination, and custody transfer verification under reservoir-relevant T&P conditions.
- Refining: Real-time density feedback for fractionation control, blend optimization (e.g., gasoline, jet fuel), and asphaltene precipitation modeling.
- Downstream quality assurance: Batch release testing of base oils, specialty chemicals, and pharmaceutical excipients where density serves as a critical identity and purity indicator.
- Research & development: Phase behavior studies, equation-of-state parameterization, and thermophysical property database generation (e.g., for DIPPR or NIST ThermoData Engine).
- Regulatory testing: Certified reference material validation, proficiency testing programs, and third-party certification labs requiring ISO/IEC 17025-compliant reporting.
FAQ
What standards does the DMA 4200 M comply with for petroleum density measurement?
ASTM D4052, ASTM D5002, GB/T 29617, ISO 12185, and ISO 16554—all verified under routine operation with FillingCheck™ enabled and Temperfect™ active.
Can the instrument measure density at elevated pressures without temperature compensation errors?
Yes. The system applies simultaneous, model-based corrections for both thermal expansion and compressibility using built-in fluid property databases and user-defined EOS parameters.
Is manual cleaning required between measurements?
No. The instrument supports automated solvent flush cycles with programmable dwell times, flow rates, and rinse repetitions—fully integrated into method protocols.
How is measurement traceability ensured?
Each unit ships with a factory calibration certificate referencing NIST SRM 1829 (water) and SRM 1830 (benzene), with recalibration intervals defined per ISO 17025 and internal QA procedures.
Does the DMA 4200 M support unattended overnight operation?
Yes. With optional autosampler integration and watchdog-triggered error recovery, it executes scheduled sequences—including temperature ramps, pressure holds, and multi-sample batches—with full data logging and email alerts on completion or fault.
