Anton Paar DMA35 Standard Portable Digital Density Meter

Overview

The Anton Paar DMA35 Standard is a handheld digital density meter engineered for high-precision liquid density and concentration measurements under field conditions—without compromising laboratory-grade accuracy. It operates on the principle of oscillating U-tube densitometry: a precisely machined borosilicate glass measuring cell is excited to resonate at its natural frequency, which correlates directly to the mass of the sample filling the tube. This physical relationship—governed by the Hooke–Newton equation—is temperature-compensated in real time using an integrated Peltier-controlled sensor (±0.01 °C resolution), enabling traceable, repeatable results across diverse ambient conditions from 0 °C to 40 °C. Unlike traditional hydrometers or pycnometers, the DMA35 eliminates operator-dependent error and requires only 2 mL of sample—making it ideal for quality control in process lines, fermentation tanks, distilleries, fuel depots, and chemical distribution sites where portability, robustness, and regulatory compliance are non-negotiable.

Key Features

• IP65-rated splash-proof enclosure with reinforced rubber overmold and chemically resistant hard-glass front panel—designed for industrial environments including outdoor operation, factory floors, and mobile laboratories.
• Patented AT516421 B1 oscillating tube coupling mechanism allows safe, tool-free replacement of the measuring cell in case of breakage—minimizing downtime and eliminating need for factory recalibration.
• Capacitive touch interface with glove-compatible responsiveness and ambidextrous layout; screen auto-rotates to maintain optimal orientation regardless of instrument positioning.
• Integrated manual pump and syringe-compatible inlet enable rapid, bubble-free filling—even for viscous samples up to 20,000 mPa·s—with automatic viscosity correction applied in real time during measurement.
• RFID-enabled workflow: scan pre-programmed tags to instantly load method parameters (e.g., calibration curve, temperature setpoint, unit output); gesture-based start/stop via proximity detection simplifies one-handed operation.
• Explosion-proof variants (DMA35 Ex and DMA35 Ex Petrol) certified to ATEX Directive 2014/34/EU and IECEx standards ([Ex] II 2 G Ex ib IIB T4), making them the only portable density meters approved for Zone 1 hazardous areas—especially critical for petrochemical, solvent, and ethanol-handling applications.

Sample Compatibility & Compliance

The DMA35 Standard supports aqueous solutions, alcohols, hydrocarbons, acids, bases, and organic solvents—provided they do not attack borosilicate glass or elastomer seals. Its dedicated DMA35 Ex Petrol version features enhanced corrosion resistance for aggressive petroleum fractions, fully satisfying ASTM D7777 (Standard Test Method for Density of Petroleum Products by Digital Density Meter) and IP 559 (Determination of Density of Crude Oil and Liquid Petroleum Products). All models comply with ISO 12185 (Crude oil and petroleum products — Determination of density — Digital density meters) and support GLP/GMP data integrity requirements through audit-trail-capable firmware (time-stamped measurements, user ID logging, and tamper-evident storage).

Software & Data Management

Measurements are stored internally with full metadata—including date/time stamp, sample ID (up to 250 programmable IDs), operator code, temperature, and raw oscillation period. Data export is supported via Bluetooth® 4.2 to PCs, mobile devices, or thermal printers in CSV or plain-text format—no proprietary software required. Firmware updates and configuration backups are performed over USB-C. The device maintains full traceability per FDA 21 CFR Part 11 when paired with validated enterprise systems, supporting electronic signatures and secure user access levels.

Applications

• Fermentation monitoring: real-time density tracking of wort, must, and mash—enabling precise alcohol-by-volume (ABV) estimation and fermentation endpoint detection.
• Petrochemical QA/QC: field verification of diesel, gasoline, biodiesel blends, and lubricants against specification limits.
• Chemical manufacturing: concentration control of acids, caustics, glycols, and polymer solutions without lab turnaround delay.
• Food & beverage: Brix, Plato, and alcohol content determination in breweries, wineries, and dairy processing units.
• Environmental testing: density profiling of contaminated groundwater or leachate in remediation sites.

FAQ

What is the minimum sample volume required for a valid measurement?
A minimum of 2 mL is required to fully fill the oscillating U-tube cell and ensure stable resonance detection.
Does the DMA35 compensate for sample viscosity?
Yes—automatic viscosity correction is applied in real time using a built-in algorithm calibrated against reference oils, ensuring accurate density values even for samples up to 20,000 mPa·s.
Can the measuring cell be replaced in the field?
Yes—the patented quick-release coupling (AT516421 B1) allows users to replace the glass measuring cell without tools or recalibration services.
Is the device suitable for use in explosive atmospheres?
Only the certified DMA35 Ex and DMA35 Ex Petrol models meet ATEX and IECEx requirements for Zone 1 hazardous locations; standard DMA35 is not explosion-protected.
How is temperature controlled during measurement?
An integrated Peltier element stabilizes the measuring cell temperature to ±0.01 °C, independent of ambient fluctuations—critical for thermally sensitive samples like hot wort or warm crude.