Jihepu GM-0.5B Corrosion-Resistant Diaphragm Vacuum Pump

Overview

The Jihepu GM-0.5B Corrosion-Resistant Diaphragm Vacuum Pump is an engineered solution for laboratories handling aggressive chemical vapors and condensates in vacuum applications. Unlike oil-lubricated rotary vane pumps, this unit operates on a dry, oil-free diaphragm principle—utilizing a reciprocating PTFE-coated elastomeric diaphragm to generate vacuum through positive displacement. Its sealed architecture eliminates oil contamination risks and ensures consistent performance across chemically demanding workflows such as acid digestion, halogenated solvent evaporation, or corrosive gas sampling. Designed for continuous operation under moderate vacuum loads, the GM-0.5B delivers stable pumping speed up to 30 L/min while maintaining ultimate vacuum levels of ≤50 mbar (≥0.095 MPa absolute), making it suitable for routine vacuum filtration, rotary evaporation, vacuum concentration, and solid-phase extraction where material compatibility—not ultra-high vacuum—is the primary requirement.

Key Features

• PTFE-wetted components: All gas-contact surfaces—including diaphragm, valve plates, pump head interior, and inlet/outlet fittings—are lined or constructed from polytetrafluoroethylene, providing resistance to concentrated mineral acids (e.g., HNO₃, H₂SO₄, aqua regia), alkalis (e.g., NaOH, KOH), oxidizers (e.g., H₂O₂, ClO₃⁻), and organic solvents (e.g., chloroform, THF, DMF).
• Thermal stability: PTFE components retain mechanical integrity across –190 °C to +260 °C, enabling safe operation in ambient environments from 7 °C to 40 °C without degradation of sealing performance or dimensional stability.
• Low-noise operation: Acoustic output remains below 50 dB(A) at 1 m distance, meeting ISO 7779 requirements for quiet laboratory instrumentation and supporting shared lab environments.
• Robust motor integration: A 160 W, 230 VAC/50 Hz induction motor drives the eccentric mechanism with thermal overload protection and optimized torque delivery for long-term reliability under variable load conditions.
• Compact footprint: With external dimensions of 300 × 120 × 235 mm (L×W×H) and a mass of only 10 kg, the unit fits seamlessly beneath fume hoods or on benchtops with limited space—ideal for modular lab setups.

Sample Compatibility & Compliance

The GM-0.5B is validated for use with chemically heterogeneous sample streams common in pharmaceutical QC, fine chemical synthesis, and environmental analysis labs. Its PTFE-based fluid path meets ASTM D471 (rubber property testing) and ISO 15203 (chemical resistance classification) criteria for elastomeric materials exposed to aggressive media. While not certified for explosive atmospheres (ATEX), it complies with IEC 61000-6-3 (EMC emissions) and IEC 61000-6-2 (immunity), and carries CE marking per Directive 2014/30/EU (EMC) and 2014/35/EU (LVD). For GLP/GMP-regulated environments, its fixed-speed operation and absence of firmware-based control logic simplify audit readiness—no 21 CFR Part 11 electronic record requirements apply.

Software & Data Management

This is a standalone, manually operated vacuum pump with no embedded microcontroller, touchscreen interface, or digital communication ports (e.g., RS-232, USB, or Ethernet). All operational parameters—including runtime, pressure setpoints, or flow monitoring—are managed externally via connected vacuum gauges, pressure controllers, or process automation systems. Its simplicity supports fail-safe operation in regulated settings where deterministic behavior and minimal validation burden are prioritized over smart functionality.

Applications

• Vacuum-assisted filtration of acidic or alkaline suspensions (e.g., catalyst recovery, metal hydroxide precipitation)
• Rotary evaporation of halogenated or sulfur-containing solvents under reduced pressure
• Concentration of peptide digests or nucleic acid extracts without risk of PTFE-incompatible residue buildup
• Gas-phase sampling in corrosion studies involving SO₂, HCl, or NH₃
• Preparation of air-sensitive reagents using Schlenk-line compatible manifolds
• Supporting solid-phase extraction cartridges during elution with aggressive eluents (e.g., trifluoroacetic acid in LC-MS method development)

FAQ

Is the GM-0.5B suitable for vacuum distillation of hydrofluoric acid (HF)?

No. Although PTFE exhibits high resistance to most acids, HF attacks fluoropolymers at elevated temperatures or concentrations; alternative containment strategies (e.g., passivated stainless steel with specialized seals) are required.
Can this pump be used continuously for 8+ hours per day?

Yes—its thermally managed motor and low-friction PTFE diaphragm enable extended duty cycles; however, periodic inspection of diaphragm elasticity and valve seating is recommended every 500 operating hours.
Does the pump include an integrated vacuum gauge or pressure regulator?

No. External analog or digital vacuum sensors must be installed upstream to monitor system pressure; optional inline regulators (e.g., needle valves with PTFE seats) may be added separately.
What maintenance intervals are recommended for the diaphragm assembly?

Under typical lab usage (≤4 hrs/day, non-condensing vapors), replace the diaphragm and valve set every 12–18 months; frequency increases with exposure to condensable or particulate-laden streams.
Is the unit compatible with 115 VAC / 60 Hz power supplies?

No—it is factory-configured for 230 VAC, 50 Hz operation; voltage conversion requires an externally rated isolation transformer meeting IEC 61558 standards.