HengAo HPD-25 Oil-Free Diaphragm Vacuum Pump

Overview

The HengAo HPD-25 Oil-Free Diaphragm Vacuum Pump is an engineered solution for laboratory vacuum applications requiring clean, contamination-free operation. Unlike oil-lubricated rotary vane pumps, this diaphragm-based system operates without hydrocarbon vapors or lubricant carryover—making it ideal for solvent-sensitive filtration, degassing, rotary evaporation support, and vacuum drying where sample integrity and downstream equipment protection are critical. Its working principle relies on reciprocating elastomeric diaphragms driven by a precision-balanced eccentric shaft, generating vacuum through cyclic expansion and contraction of the pump chamber. The HPD-25 delivers stable suction performance across a wide range of inlet pressures and flow conditions, with a nominal pumping speed of 25 L/min at atmospheric pressure and an ultimate vacuum level between –0.04 MPa and –0.08 MPa (equivalent to ~300–600 mbar absolute). Designed for continuous-duty laboratory use, its robust architecture supports reliable operation in QC labs, academic research facilities, and small-scale pilot environments.

Key Features

• Oil-free operation ensures zero risk of oil vapor contamination—critical for HPLC sample preparation, lyophilization pre-treatment, and analytical chemistry workflows.
• Reinforced 3 mm elastomeric diaphragm with embedded textile reinforcement layer enhances fatigue resistance and extends service life under repeated compression cycles.
• Optimized 85 W induction motor provides sufficient torque for consistent diaphragm actuation while minimizing thermal load and energy consumption.
• Compact footprint (320 × 140 × 240 mm) and lightweight design (4 kg) facilitate benchtop integration and portability across shared lab spaces.
• Low-noise operation (<55 dB(A) at 1 m distance) supports quiet laboratory environments without compromising vacuum performance.
• Optional configurations available—including adjustable pressure control (HPD-25D) and enhanced vacuum capability up to –0.1 MPa (HPD-25A)—enabling application-specific customization.

Sample Compatibility & Compliance

The HPD-25 is compatible with standard laboratory vacuum accessories including Buchner funnels, filter flasks (up to 5 L), desiccators, and vacuum manifolds. It is suitable for aqueous, mildly polar, and low-volatility organic solvents; however, prolonged exposure to highly aggressive solvents (e.g., chlorinated hydrocarbons, strong acids/bases) is not recommended without inline cold traps or chemical scrubbers. While not certified to ISO 8573-1 for compressed air purity, its oil-free construction aligns with Good Laboratory Practice (GLP) requirements for traceability and contamination control. The pump meets CE electromagnetic compatibility (EMC) directives and conforms to IEC 61000-6-3 for industrial emission limits.

Software & Data Management

The HPD-25 operates as a standalone analog device with no embedded firmware or digital interface. All operational parameters—including vacuum level and flow rate—are manually monitored via external gauges or integrated vacuum sensors in connected systems. For laboratories implementing electronic lab notebooks (ELN) or LIMS, vacuum event logging requires external pressure transducers (e.g., capacitance manometers) paired with data acquisition hardware. No proprietary software or driver installation is required. The unit complies with basic electrical safety standards per IEC 61010-1 for laboratory equipment and supports audit-ready documentation when used within validated SOPs referencing ASTM D2873 (vacuum filtration efficiency) or USP environmental control protocols.

Applications

• Routine vacuum filtration of biological suspensions, particulate slurries, and precipitate recovery in pharmaceutical development.
• Pre-concentration and solvent removal in environmental sample preparation (e.g., EPA Method 505, 525.3).
• Supporting rotary evaporators during low-boiling-point solvent removal under mild vacuum conditions.
• Degassing of polymer solutions, adhesives, and casting resins prior to curing or microscopy embedding.
• Vacuum-assisted drying of heat-sensitive samples in freeze-dryer primary condenser purge cycles.
• Gas sampling system priming and calibration gas delivery in analytical instrument maintenance workflows.

FAQ

Is the HPD-25 suitable for continuous 24/7 operation?
It is rated for intermittent duty cycles (up to 6 hours/day); extended continuous use may accelerate diaphragm wear and requires active thermal monitoring.
Can I connect this pump directly to a mass spectrometer inlet?
No—this pump does not achieve the high vacuum levels (<10⁻³ mbar) required for MS interfaces; it is intended for rough vacuum applications only.
What maintenance intervals are recommended?
Diaphragm inspection every 6 months under normal use; replacement advised after ~5,000 operating hours or visible cracking/stiffening.
Does the HPD-25 meet FDA 21 CFR Part 11 requirements?
As a non-networked, non-data-logging device, it has no electronic records or audit trail functionality—but its mechanical reliability supports compliant process validation when documented per GMP Annex 15.
How do I prevent solvent backflow into the pump head?
Always install an inline solvent trap (e.g., glass U-trap or PTFE-coated desiccant cartridge) between the vacuum source and pump inlet.