HPD-25A High-Performance Oil-Free Diaphragm Vacuum Pump

Overview

The HPD-25A is a compact, oil-free diaphragm vacuum pump engineered for reliable, contamination-free operation in analytical, preparative, and quality control laboratories. It operates on positive displacement principle via an elastomeric diaphragm actuated by an eccentric cam mechanism — eliminating the need for lubricating oil and preventing hydrocarbon or particulate contamination of vacuum lines, samples, or downstream instrumentation. Designed for continuous-duty intermittent operation, it delivers stable vacuum performance up to –0.08 MPa (gauge), corresponding to approximately 80 kPa absolute pressure — sufficient for routine filtration, solvent evaporation, degassing of aqueous or low-viscosity organic solutions, and vacuum drying of heat-sensitive materials. Its 50 W brushless motor ensures thermal stability during extended use, while the optimized gear-train and vibration-damping housing contribute to long-term mechanical integrity under typical lab conditions.

Key Features

• Oil-free diaphragm architecture ensures zero risk of oil backstreaming or sample contamination — compliant with ISO 8573-1 Class 0 air purity requirements for critical vacuum applications.
• Reinforced 3 mm elastomeric diaphragm with integrated textile-fiber reinforcement layer enhances fatigue resistance and extends service life beyond 10,000 operating hours under nominal load.
• Optimized airflow path and dual-stage pump head configuration (in HPD-25A variant) enables improved ultimate vacuum performance compared to single-stage equivalents — reaching up to –0.08 MPa (gauge) consistently across ambient temperatures from 15–35°C.
• Low-noise design (<52 dB(A) at 1 m distance) minimizes acoustic interference in shared laboratory environments; meets ISO 3744 acoustic emission standards for laboratory equipment.
• Compact footprint (245 × 135 × 245 mm) and lightweight construction (4 kg) support benchtop integration, mobile cart mounting, or integration into OEM vacuum manifolds and automated sample preparation systems.
• Standard IEC 60320 C14 inlet and CE-compliant power supply enable global compatibility with 100–240 VAC, 50/60 Hz mains — certified to EN 61000-6-3 (EMC) and EN 61000-6-2 (immunity).

Sample Compatibility & Compliance

The HPD-25A is compatible with aqueous buffers, ethanol, methanol, acetone, ethyl acetate, and other low-boiling, non-aggressive solvents commonly used in HPLC sample prep, gravimetric analysis, and membrane filtration. It is not recommended for use with halogenated hydrocarbons (e.g., chloroform, DCM), strong oxidizers (e.g., nitric acid vapor), or highly viscous media (>500 cP) without inline cold traps or chemical scrubbers. The pump conforms to general-purpose laboratory safety guidelines per IEC 61010-1 and carries RoHS 3 and REACH compliance documentation. While not intrinsically safe for Zone 1 hazardous areas, its sealed motor and non-sparking diaphragm assembly make it suitable for general-purpose labs operating under GLP or ISO/IEC 17025-accredited quality systems.

Software & Data Management

As a standalone analog vacuum source, the HPD-25A does not incorporate embedded firmware, digital displays, or data logging capabilities. However, it supports integration into automated workflows via optional external pressure sensors (e.g., capacitance manometers) and programmable logic controllers (PLCs). When paired with third-party vacuum controllers (e.g., MKS 974B or Pfeiffer TPG300 series), users can implement closed-loop vacuum regulation, event-triggered shutdown, and audit-trail-capable process logging — enabling alignment with FDA 21 CFR Part 11 requirements where electronic records are mandated. Calibration certificates traceable to NIST standards are available upon request for metrological verification.

Applications

• Routine vacuum filtration of biological suspensions, colloidal dispersions, and particulate-laden solutions using Buchner or Hirsch funnels.
• Accelerated degassing of HPLC mobile phases, cell culture media, and polymer precursor mixtures prior to casting or injection.
• Support vacuum drying of lyophilized standards, calibration reference materials, and moisture-sensitive reagents in desiccators or vacuum ovens.
• Evacuation of gas chromatography sample vials and headspace autosampler systems requiring stable sub-atmospheric pressure.
• Integration into custom-built vacuum manifolds for multi-port parallel filtration, solid-phase extraction (SPE), or vacuum-assisted centrifugation setups.

FAQ

What is the maximum allowable inlet pressure for continuous operation?
Continuous operation is rated for inlet pressures ≥ –0.08 MPa (gauge); sustained exposure to pressures below –0.09 MPa may accelerate diaphragm flex fatigue and reduce service life.
Can this pump be used with corrosive vapors such as HCl or NH₃?
No — the standard EPDM/NBR diaphragm material is incompatible with strong acids, bases, or oxidizing agents. For such applications, consult factory for fluorocarbon-elastomer (FKM) diaphragm upgrade options.
Is the HPD-25A suitable for vacuum oven applications?
Yes, provided the oven’s maximum operating temperature remains below 40°C ambient at the pump inlet and a condensate trap is installed to prevent liquid ingress.
Does the pump include built-in overheat protection?
Yes — thermal cutoff switch activates at 95°C motor winding temperature and resets automatically upon cooling to <60°C.
What maintenance intervals are recommended?
Diaphragm inspection every 6 months under daily use; replacement every 12–18 months depending on duty cycle and solvent exposure — no lubrication or valve servicing required.