English Product Name

Overview

The Jihepu GM-0.5A PTFE-Lined Diaphragm Vacuum Pump is an oil-free, dual-pressure (vacuum and positive pressure) laboratory pump engineered for chemical resistance and operational reliability in aggressive gas-handling environments. Unlike rotary vane or piston pumps requiring lubricating oil—and thus vulnerable to chemical degradation—the GM-0.5A employs a sealed diaphragm mechanism driven by an eccentric cam and precision-machined valves. Its core performance relies on reciprocating motion of a PTFE-coated elastomeric diaphragm, which isolates the drive mechanism from process gases entirely. This architecture eliminates oil contamination, prevents vapor backstreaming, and ensures consistent vacuum generation even when handling corrosive vapors such as HCl, HF, Cl₂, SO₂, NH₃, organic halides, and concentrated oxidizing agents—including aqua regia and fuming nitric acid. With a nominal ultimate vacuum of ≥0.08 MPa (200 mbar abs) and a pumping speed of 30 L/min at atmospheric inlet, the GM-0.5A delivers stable suction across typical laboratory vacuum ranges (100–200 mbar), making it suitable for applications where material compatibility—not ultra-high vacuum—is the primary engineering constraint.

Key Features

• Full wetted-path PTFE lining: All gas-contact surfaces—including diaphragm, valve plates, and internal chamber walls—are coated or constructed with chemically inert polytetrafluoroethylene (PTFE), ensuring compatibility with strong acids, bases, oxidizers, and solvents.
• Dual-pressure operation: Capable of generating both vacuum (down to 200 mbar abs) and positive pressure (≥30 psi), enabling use in purge-and-trap systems, pressure-assisted filtration, and inert gas blanketing.
• Oil-free and maintenance-minimized design: No lubrication required; diaphragm and valve assemblies are replaceable as field-service kits, reducing downtime and eliminating risk of hydrocarbon contamination in sensitive analytical workflows.
• Thermally stable construction: PTFE maintains mechanical integrity from –190 °C to +260 °C; pump head temperature remains below 55 °C during continuous operation, minimizing thermal stress on seals and adjacent instrumentation.
• Low-noise, low-vibration profile: Optimized motor-balancing and elastomeric mounting yield acoustic emissions <60 dB(A) at 1 m—suitable for shared lab spaces and proximity to sensitive balances or optical equipment.
• Compact footprint and integrated port geometry: 210 × 160 × 235 mm chassis accommodates standard benchtop layouts; symmetrical φ6 mm NPT-compatible ports simplify tubing routing and manifold integration.

Sample Compatibility & Compliance

The GM-0.5A is validated for use with corrosive, condensable, and reactive process streams common in pharmaceutical API synthesis, fine chemical purification, environmental sample preparation (e.g., EPA Method 502.2, 524.2), and academic reaction monitoring. Its PTFE-wetted path meets ASTM D471 requirements for elastomer resistance to aggressive fluids and aligns with ISO 8573-1 purity Class 4 (oil-free air) for vacuum-side output. While not certified to FDA 21 CFR Part 11 out-of-the-box, its deterministic pressure response, absence of analog feedback loops, and repeatable cycle timing support traceable operation under GLP and GMP-aligned SOPs—particularly when paired with external digital vacuum controllers logging timestamped setpoints and runtime data.

Software & Data Management

The GM-0.5A operates as a standalone analog device without embedded firmware or digital interfaces. However, its stable pressure output and predictable duty-cycle behavior make it compatible with third-party vacuum control systems (e.g., Vacuubrand VACUU·SELECT, KNF LabControl) via 0–10 V or 4–20 mA analog I/O. For audit-ready documentation, users may integrate the pump into LabArchives or ELN platforms using external pressure transducers (e.g., MKS Baratron 627B) and programmable logic controllers (PLCs) that record vacuum ramp rates, hold durations, and fault events—including overtemperature or stall detection—enabling full compliance with ALCOA+ data integrity principles.

Applications

• Vacuum-assisted techniques: Filtration (including Büchner and Hirsch funnels), rotary evaporation (with solvent recovery traps), vacuum concentration (e.g., SpeedVac alternatives), and freeze-drying pre-evacuation stages.
• Pressure-driven workflows: Solid-phase extraction (SPE) cartridge conditioning/elution, gas purging of reaction vessels, and inert atmosphere transfer of air-sensitive reagents.
• Chemical synthesis support: Distillation under reduced pressure for heat-labile compounds, degassing of catalyst slurries, and vacuum drying of hygroscopic intermediates.
• Environmental and QC labs: Headspace sampling preparation, purge-and-trap concentration for VOC analysis (EPA 502/524), and membrane filtration of acidic digests (e.g., EPA 3015A).

FAQ

Is the GM-0.5A certified for use in explosion-proof environments?
No. It lacks ATEX or IECEx certification and must be operated outside classified hazardous zones unless installed within an externally rated enclosure meeting NEC Class I, Division 2 requirements.
Can this pump handle condensable vapors such as ethanol or acetone?
Yes—provided a cold trap (e.g., dry ice/isopropanol) is placed upstream to prevent liquid ingress; prolonged exposure to high-concentration solvent vapors without trapping may accelerate diaphragm swelling.
What is the expected service life of the PTFE-coated diaphragm under continuous operation?
At 24/7 duty cycle and ambient temperatures ≤30 °C, mean time between replacements is ≥6,000 hours; lifetime decreases linearly above 35 °C ambient due to elastomer creep acceleration.
Does the pump include an integrated vacuum gauge or pressure relief valve?
No—both are external accessories. Users must install a calibrated analog or digital vacuum gauge (e.g., Pirani or capacitance manometer) and a spring-loaded relief valve (set to ≤35 psi) for overpressure protection.
Is the motor thermally protected?
Yes—the 160 W induction motor includes Class B insulation and a bimetallic thermal cutoff that interrupts power at ≥130 °C winding temperature, automatically resetting upon cooldown.