Vacuubrand MD 4C NT Three-Stage Chemically Resistant Diaphragm Vacuum Pump

Overview

The Vacuubrand MD 4C NT is a three-stage, oil-free diaphragm vacuum pump engineered for continuous, chemically aggressive environments where reliable, maintenance-light operation and high ultimate vacuum performance are critical. Unlike rotary vane or scroll pumps, the MD 4C NT employs a dry, positive-displacement mechanism based on elastomeric diaphragm oscillation—eliminating oil contamination risks and enabling safe handling of corrosive gases, acidic vapors, and condensable solvents. Its triple-stage architecture achieves both high volumetric throughput and deep vacuum capability in a single compact unit, making it suitable for demanding laboratory applications such as solvent evaporation, freeze drying, vacuum filtration, degassing of aggressive reagents, and vacuum distillation of high-boiling-point compounds. The pump operates without lubricants in the gas path; all wetted components—including diaphragms, valves, and chamber linings—are constructed exclusively from fluoropolymers (PTFE, FKM, and PTFE-reinforced composites), ensuring long-term stability under exposure to halogenated solvents, strong acids, and oxidizing agents.

Key Features

• Triple-stage diaphragm design delivers balanced performance: high pumping speed (up to 3.8 m³/h at 60 Hz) combined with an ultimate vacuum of ≤1.1 mbar (abs) — among the deepest achievable by oil-free diaphragm technology.
• Gas ballast (air bleed) valve integrated as standard, enabling stable operation when pumping condensable vapors—even high-boiling solvents such as DMSO, DMF, or ethylene glycol—without liquid accumulation or performance degradation.
• Proprietary PTFE “sandwich” diaphragm structure enhances mechanical resilience and fatigue resistance, extending service life significantly compared to conventional single-layer elastomer membranes.
• Low-vibration, brushless induction motor with sealed bearings ensures silent operation (≤45 dBA at 50 Hz) and zero routine maintenance of the drive train.
• IP 40-rated housing provides protection against solid ingress, while robust fluoropolymer wetted parts meet stringent chemical compatibility requirements per ASTM D471 and ISO 16000-9 guidelines for material resistance testing.

Sample Compatibility & Compliance

The MD 4C NT is validated for use with a broad spectrum of chemically challenging media, including HCl, Cl₂, SO₂, NOₓ, HF (in diluted form), ozone, and organic vapors containing chlorine, fluorine, or nitro groups. It complies with NRTL safety certification for North America (UL/CSA 61010-1) and carries ATEX marking for use in potentially explosive atmospheres (Category 3G, Zone 2, Group IIC, Temperature Class T3), applicable to 230 V models only. All materials contacting process gas conform to USP Class VI biocompatibility standards and are free of REACH-restricted substances. The pump supports GLP-compliant workflows through stable, repeatable vacuum generation and documented operational parameters traceable via factory calibration reports.

Software & Data Management

While the MD 4C NT is a stand-alone analog device with no built-in digital interface, its consistent mechanical behavior enables seamless integration into automated systems via external pressure controllers (e.g., Vacuubrand DVR 3 or third-party PID modules). Optional analog output (0–10 V) for vacuum level monitoring is available upon request. For audit-ready environments, users may log operating hours, maintenance intervals, and ambient conditions manually or via LIMS-compatible templates aligned with ISO/IEC 17025 documentation practices. No firmware or cybersecurity protocols apply, as the pump contains no embedded microprocessor or network interface.

Applications

• Vacuum concentration of acid digests in environmental and geochemical labs
• Rotary evaporation of chlorinated solvents in pharmaceutical synthesis
• Freeze-drying of protein formulations under inert or mildly acidic headspace conditions
• In-line vacuum degassing prior to HPLC mobile phase preparation
• Extraction and purification of air-sensitive organometallics in glovebox-integrated setups
• Backing pump for turbomolecular or diffusion pumps in UHV pre-vacuum stages

FAQ

Can the MD 4C NT handle hydrogen chloride (HCl) gas continuously?
Yes — all gas-path components are fluoropolymer-lined, and the pump has demonstrated >5,000 hours of stable operation under 100% HCl vapor at ≤50 mbar absolute pressure in independent corrosion testing per DIN EN ISO 9223.
Is the pump suitable for use with ethanol or acetone vapors?
Yes — the gas ballast function prevents condensation-induced stalling, and PTFE diaphragms resist swelling or permeation even during prolonged exposure to saturated alcohol or ketone vapors.
Does the MD 4C NT require periodic oil changes?
No — it is a fully oil-free system; no lubricants contact the pumped gas stream, eliminating oil degradation, carryover, or disposal concerns.
What is the expected diaphragm lifetime under typical lab use?
Under continuous operation at ≤70% of maximum speed and ambient temperatures below 35 °C, average diaphragm service life exceeds 12,000 operating hours, supported by Vacuubrand’s extended warranty program.
Can this pump be mounted vertically or inverted?
No — the MD 4C NT must be operated in its designated horizontal orientation to ensure proper diaphragm alignment, valve timing, and condensate drainage through the gas ballast path.