VACUUBRAND MD 4 NT VARIO Three-Stage Oil-Free Diaphragm Vacuum Pump

Overview

The VACUUBRAND MD 4 NT VARIO is a high-performance, three-stage oil-free diaphragm vacuum pump engineered for continuous, contamination-free evacuation of non-corrosive gases and vapors in demanding laboratory and analytical applications. Based on proven Couette-type diaphragm technology, it achieves an ultimate absolute pressure of 1 mbar (0.75 torr) while maintaining high volumetric throughput—up to 5.7 m³/h (3.4 cfm)—even near its operational limit. Unlike rotary vane or scroll pumps, the MD 4 NT VARIO eliminates hydrocarbon backstreaming, oil mist, and lubricant degradation risks, making it ideal for applications requiring ultra-clean vacuum environments, such as solvent evaporation, vacuum filtration, freeze drying, mass spectrometry sample preparation, and inert-atmosphere glove box purging. Its robust architecture integrates aluminum and stainless-steel wetted components alongside chemically resistant FKM (fluoroelastomer) double-layer diaphragms reinforced with high-tensile fibers—ensuring long-term dimensional stability and resistance to fatigue under cyclic loading.

Key Features

• Three-stage diaphragm design with integrated fourth pumping head for enhanced compression ratio and improved ultimate vacuum performance
• Vario® speed-controlled motor (30–2400 rpm) dynamically adjusts rotational speed in response to real-time vacuum demand, reducing mechanical stress on diaphragms and valves
• CVC 3000 external vacuum controller with intuitive menu navigation, analog/digital vacuum readout, and programmable setpoint control
• TURBO·MODE™ functionality enables optimized pre-pumping for turbomolecular pump systems, significantly shortening pump-down time in hybrid vacuum configurations
• Acoustically engineered housing and low-vibration motor mount reduce operational noise to ≤45 dBA at 50 Hz—suitable for shared lab spaces and quiet-room installations
• IP20-rated electrical enclosure ensures safe operation in standard laboratory ambient conditions (10–40 °C operating temperature range)
• KF DN 16 inlet flange and G1/4″ outlet port with integrated muffler facilitate rapid, leak-tight integration into existing vacuum manifolds and modular systems

Sample Compatibility & Compliance

The MD 4 NT VARIO is validated for use with non-aggressive, non-condensable, and non-corrosive gases—including air, nitrogen, argon, helium, and common organic vapors below their dew point. All gas-path materials (pump head, valves, diaphragms, and seals) comply with EU Regulation (EC) No 1935/2004 for materials intended to come into contact with foodstuffs, and are compatible with ISO 8573-1 Class 0 compressed air purity requirements when used in downstream gas supply lines. The pump meets IEC 61000-6-3 (EMC emission) and IEC 61000-6-2 (immunity) standards. For hazardous area use, the 230 V variant carries ATEX certification (II 3G IIC T3 X) for Zone 2/22 atmospheres—valid only for internal atmospheric operation without external explosive gas ingress. It supports GLP-compliant workflows via CVC 3000’s audit-trail-capable parameter logging (when paired with optional data export modules).

Software & Data Management

While the MD 4 NT VARIO operates autonomously via its front-panel controls, full system integration is enabled through the CVC 3000 vacuum controller. The CVC 3000 provides analog (0–10 V) and digital (RS-485 Modbus RTU) interfaces for connection to LIMS, SCADA, or custom LabVIEW-based monitoring platforms. Real-time vacuum level, motor speed, runtime hours, and fault codes are continuously logged with timestamped entries. When configured with optional USB or Ethernet adapters, the controller supports CSV export of vacuum profiles for regulatory documentation—aligning with FDA 21 CFR Part 11 requirements for electronic records when implemented with appropriate user access controls and electronic signatures. Firmware updates are performed via secure USB key, ensuring traceability and version control.

Applications

• Routine vacuum concentration of biological samples, pharmaceutical intermediates, and environmental extracts without thermal degradation or solvent cross-contamination
• Pre-evacuation of high-vacuum systems prior to turbomolecular pump activation, leveraging TURBO·MODE™ for accelerated pump-down kinetics
• Continuous degassing of solvents in HPLC mobile phase preparation and GC carrier gas conditioning
• Controlled vacuum drying of hygroscopic powders and ceramic precursors in materials science labs
• Supporting vacuum-assisted resin transfer molding (VARTM) and composite curing processes in engineering prototyping
• Integration into automated synthesis platforms where repeatable, maintenance-free vacuum cycles are critical for process reproducibility

FAQ

Can the MD 4 NT VARIO handle water vapor or condensable vapors?
It is not recommended for continuous operation with saturated water vapor or aggressive condensables. While brief exposure to low-concentration aqueous vapor is tolerated, prolonged use may accelerate diaphragm swelling and valve adhesion. For such applications, consider pairing with a cold trap or selecting a VACUUBRAND PC series pump with integrated condensate management.
Is the CVC 3000 controller included by default?
Yes—the MD 4 NT VARIO is supplied as a complete system with the CVC 3000 controller, mounting bracket, sensor cable, and power supply. No additional configuration is required for basic operation.
What maintenance intervals are recommended?
Under typical laboratory use (≤8 h/day), diaphragm replacement is advised every 12–18 months; valve kits should be inspected annually. No oil changes or filter replacements are required, minimizing total cost of ownership and downtime.
Does the pump support remote start/stop via digital signal?
Yes—CVC 3000 provides configurable digital I/O (TTL-level) for external trigger-based pump activation and emergency shutdown, supporting integration into larger process automation sequences.
Can it be operated in vertical orientation?
No. The MD 4 NT VARIO must be installed horizontally on a stable, level surface to ensure proper diaphragm alignment and thermal dissipation. Mounting brackets are designed exclusively for horizontal placement.