VACUUBRAND DVR 3pro ATEX-Certified Explosion-Proof Capacitive Ceramic Diaphragm Vacuum Gauge

Overview

The VACUUBRAND DVR 3pro is a fully electronic, ATEX-certified explosion-proof vacuum gauge engineered for reliable absolute pressure measurement in hazardous environments classified under ATEX Zone 2 (II 2G Ex ib IIC T4 Gb). It employs a monolithic alumina (Al₂O₃) ceramic diaphragm-based capacitive sensor — a gas-independent transduction principle that ensures consistent accuracy across diverse process gases (e.g., N₂, O₂, Ar, H₂, CO₂, solvents, and corrosive vapors) without requiring gas-specific calibration factors. Unlike thermal conductivity or Pirani gauges, the DVR 3pro delivers stable, drift-resistant readings over extended operational lifetimes due to the inherent mechanical robustness and chemical inertness of its ceramic sensing element. Its all-digital architecture eliminates analog signal degradation, while the integrated microprocessor enables real-time compensation for ambient temperature fluctuations (< 0.15 mbar/K), ensuring metrological integrity within its specified operating range of 1–1060 mbar (0.75–795 torr). Designed for standalone field deployment, it operates exclusively from a standard 9 V alkaline battery — eliminating dependency on mains power, external controllers, or signal conditioners.

Key Features

• ATEX-certified for use in potentially explosive atmospheres (II 2G Ex ib IIC T4 Gb), compliant with Directive 2014/34/EU
• Gas-independent absolute pressure measurement using a hermetically sealed alumina ceramic diaphragm capacitor
• High-contrast graphical + numeric dual-display interface for simultaneous trend visualization and precise value readout
• User-configurable measurement cycle (auto, 3 s, 1 s, or 0.33 s) and auto-off timer (1–600 min or continuous operation)
• Chemically resistant rigid plastic housing (IP40) suitable for laboratory fume hoods, solvent-handling systems, and industrial vacuum dryers
• No lithium batteries — uses globally available 9 V alkaline cells (IEC 6LR61), enabling safe, tool-free replacement outside hazardous zones
• Low electromagnetic susceptibility: optimized circuit layout and shielding ensure stable performance in electrically noisy industrial settings
• Minimal zero drift and low electron emission interference near measurement limits — critical for high-reproducibility process control

Sample Compatibility & Compliance

The DVR 3pro is compatible with non-aggressive and moderately aggressive vapor environments typical of vacuum drying, distillation, freeze-drying, vacuum packaging, and solvent recovery applications. Its alumina ceramic sensor exhibits exceptional resistance to condensable vapors (up to 40 °C continuous, 80 °C short-term), organic solvents (e.g., acetone, ethanol, ethyl acetate), and mildly acidic/basic process gases. It is not intended for use with hydrofluoric acid, molten alkalis, or halogenated plasmas. The device complies with EN 60079-0 (explosive atmospheres — general requirements) and EN 60079-11 (intrinsic safety “ib” protection level). While not FDA 21 CFR Part 11–compliant out-of-the-box (lacking audit trail or electronic signature functionality), its stable analog output and traceable DAkkS calibration options support integration into GLP/GMP-aligned validation protocols when paired with compliant data acquisition systems.

Software & Data Management

The DVR 3pro operates as a self-contained, firmware-driven instrument with no embedded software stack or network connectivity. All configuration (measurement interval, auto-off, display brightness) is managed via intuitive front-panel navigation. No PC software, drivers, or proprietary utilities are required. For data logging, optional analog output (0–10 V or 4–20 mA, configurable per user request) allows seamless integration with PLCs, SCADA systems, or third-party DAQ hardware. DAkkS-accredited factory calibration (certified reference standard traceable to PTB) is available as an accessory (Order No. 20900214), including full uncertainty budget documentation. Recalibration services (Order No. 20900215) maintain long-term metrological confidence in accordance with ISO/IEC 17025 requirements.

Applications

• Monitoring vacuum integrity in ATEX-classified pharmaceutical lyophilizers and solvent recovery units
• Process pressure control in chemical synthesis reactors handling flammable solvent vapors
• Quality assurance during vacuum impregnation of electrical components in hazardous-area manufacturing cells
• Field verification of vacuum levels in maintenance operations on explosion-protected HVAC and refrigeration systems
• Education and R&D labs requiring intrinsically safe, portable vacuum measurement without infrastructure dependencies

FAQ

Can the DVR 3pro be used in Zone 1 hazardous areas?
No. It is certified only for Zone 2 (gas group IIC, temperature class T4), where explosive atmospheres are unlikely to occur or persist for short durations.
Is the sensor susceptible to contamination from oil vapors or pump backstreaming?
The alumina diaphragm is highly resistant to hydrocarbon adsorption; however, prolonged exposure to heavy oil mist may require periodic cleaning per VACUUBRAND’s maintenance guidelines.
Does the device support digital communication protocols (e.g., RS-485, Modbus)?
No. It provides only analog voltage/current output as an optional add-on; native digital interfaces are not implemented.
What is the recommended recalibration interval under routine industrial use?
VACUUBRAND recommends annual recalibration when used continuously in production environments; biennial intervals are acceptable for intermittent lab use with documented stability checks.
Can the battery be replaced while the unit is connected to a vacuum system?
Battery replacement must be performed outside the designated hazardous area — power disconnection and physical removal from the ATEX zone are mandatory prior to opening the rear cover.