VACUUBRAND MD 4C EX ATEX-Certified Explosion-Proof Chemical Diaphragm Vacuum Pump

Overview

The VACUUBRAND MD 4C EX is a rigorously engineered, ATEX-certified explosion-proof chemical diaphragm vacuum pump designed for safe and reliable operation in potentially explosive atmospheres (Zone 1 and Zone 2). It operates on the principle of positive displacement via four-stage PTFE-coated diaphragms driven by an intrinsically safe, flameproof asynchronous motor (Ex d IIB T4). Unlike oil-lubricated pumps, the MD 4C EX delivers completely oil-free vacuum generation—eliminating risk of hydrocarbon contamination, oil backstreaming, or degradation under aggressive chemical vapors. Its primary application domain includes solvent-intensive processes such as rotary evaporation, vacuum drying, distillation, and degassing in pharmaceutical, fine chemical, and academic research laboratories where flammable solvents (e.g., acetone, ethanol, ether, toluene) are routinely handled. The pump’s hermetically sealed gas path ensures full compatibility with corrosive and condensable vapors, while its integrated gas ballast (supplied with dedicated inert gas inlet) enables stable operation during high-vapor-load conditions without compromising ultimate vacuum performance.

Key Features

• ATEX-certified dual-zone protection: Pump chamber rated II 2G IIC T3 X (suitable for hydrogen and acetylene-class atmospheres); motor housing rated II 2G Ex d IIB T4; optional inert-gas purged enclosure meets II 2G IIB T4 X requirements.
• Four-stage diaphragm architecture with three compression stages—optimized for high volumetric efficiency (3.7 m³/h) and deep ultimate vacuum (3 mbar absolute) without oil or lubricants.
• All wetted parts constructed from chemically inert, electrostatic-dissipative materials: PTFE-coated diaphragms, EPDM or FKM elastomers (depending on configuration), and stainless steel (1.4404/316L) pump body and valves.
• Integrated safety systems: thermal cut-out with auto-reset, electromagnetic overload protection, pressure-relief valve on exhaust port, and patented diaphragm rupture detection circuit enabling immediate shutdown upon membrane failure.
• Gas ballast system with dedicated KF DN 16 inert gas inlet (e.g., N₂ or Ar)—enabling continuous purge to suppress condensate formation and maintain stable pumping speed across volatile solvent loads.
• Robust mechanical design: IP54-rated enclosure, 1500 rpm motor speed, low-noise operation (53 dBA at 1 m), and vibration-damped mounting feet for integration into sensitive analytical platforms.

Sample Compatibility & Compliance

The MD 4C EX is validated for continuous duty with organic solvents, acidic and alkaline vapors, halogenated compounds, and reactive gases commonly encountered in GMP-compliant synthesis, API purification, and QC testing workflows. Its construction complies with ISO 8573-1 Class 0 (oil-free air/vacuum standard) and meets the mechanical integrity requirements of EN 60079-0 (explosive atmospheres – general requirements) and EN 60079-1 (flameproof enclosures “d”). For regulated environments, the pump supports audit-ready documentation packages including Factory Acceptance Test (FAT) reports, material certificates (EN 10204 3.1), and ATEX EU-Type Examination Certificates issued by notified bodies (e.g., PTB, BASEEFA). It is compatible with GLP/GMP vacuum systems requiring traceable performance logs and is routinely deployed in facilities adhering to FDA 21 CFR Part 11 when paired with compliant data acquisition software.

Software & Data Management

While the MD 4C EX operates as a standalone analog device, it features standardized 0–10 V analog input/output ports for integration into centralized laboratory control systems (e.g., Siemens Desigo, Schneider EcoStruxure, or LabVIEW-based SCADA). Optional digital interface modules (VACUUBRAND VD 1000 series) enable Modbus RTU communication, real-time monitoring of motor current, temperature, and runtime hours, and remote start/stop functionality. All operational parameters—including cumulative operating time, thermal event history, and fault codes—are stored in non-volatile memory and retrievable via service mode. Data export supports CSV format for trend analysis, preventive maintenance scheduling, and regulatory reporting. Firmware updates are performed via USB service port under controlled change management protocols aligned with ISO/IEC 17025 calibration traceability.

Applications

• Rotary evaporation of flammable solvents under ATEX-regulated hood or glovebox environments
• Vacuum drying ovens handling pyrophoric catalysts or moisture-sensitive intermediates
• Short-path distillation and molecular distillation of thermolabile compounds
• High-purity vacuum degassing of polymer precursors and electronic-grade resins
• Chemical vapor deposition (CVD) precursor delivery line roughing
• Process-scale lyophilization support in pilot plant cleanrooms (ISO Class 7/8)

FAQ

Is the MD 4C EX suitable for continuous duty with acetone or ethyl acetate?
Yes—its PTFE-diaphragm and FKM valve assembly provide full resistance to these solvents at temperatures up to 40 °C. Use of gas ballast with nitrogen purge is recommended during high-concentration vapor loads.
Can the pump be installed vertically or only horizontally?
It must be operated in the specified horizontal orientation (as shipped) to ensure proper diaphragm actuation and condensate drainage. Vertical mounting voids ATEX certification and warranty.
What maintenance intervals are recommended under GMP conditions?
Diaphragm replacement every 6,000 operating hours or annually (whichever occurs first); valve inspection every 2,000 hours; full FAT revalidation required after any major component replacement.
Does the pump comply with US NEC Class I Division 1 requirements?
No—it carries ATEX and IECEx certifications only. For North American hazardous locations, consult VACUUBRAND’s UL-listed equivalents (e.g., MD 4C UL) or third-party CSA-certified retrofit solutions.
Is the 2-m cable supplied with strain relief and grounding continuity?
Yes—the cable meets EN 50525-2-51 (H07RN-F) specifications, includes green/yellow PE conductor, and is factory-tested for grounding impedance <0.1 Ω.