Chengmeng CM25 Oil-Free Diaphragm Vacuum Pump
| Brand | Chengmeng |
|---|---|
| Model | CM25 |
| Type | Oil-Free Diaphragm Vacuum Pump |
| Ultimate Vacuum | ≥0.085 MPa |
| Pumping Speed | 25 L/min |
| Motor Power | 160 W |
| Dimensions (L×W×H) | 195×100×160 mm |
| Weight | 3.5 kg |
| Noise Level | ≤50 dB(A) |
| Input Voltage | 220 V / 50 Hz |
| Motor Speed | 1450–1700 rpm |
| Inlet Port Diameter | Ø8 mm |
| Vacuum Regulation | Yes |
Overview
The Chengmeng CM25 Oil-Free Diaphragm Vacuum Pump is an entry-level, maintenance-free laboratory vacuum source engineered for precision and chemical compatibility in analytical, preparative, and quality control workflows. Operating on a positive-displacement diaphragm principle, it generates vacuum via oscillating elastomeric diaphragms driven by an eccentric cam mechanism—eliminating the need for lubricating oil and preventing hydrocarbon contamination of sensitive samples or vacuum lines. This architecture ensures consistent performance across intermittent and continuous duty cycles, with no risk of oil backstreaming into connected equipment such as rotary evaporators, vacuum ovens, filtration manifolds, or gas sampling systems. Designed for benchtop integration in ISO 17025-accredited labs and GLP-compliant environments, the CM25 delivers stable vacuum down to ≥0.085 MPa (absolute) and sustains a nominal pumping speed of 25 L/min at atmospheric inlet pressure—sufficient for rapid solvent removal, degassing of aqueous solutions, and low-to-medium vacuum drying applications.
Key Features
- Oil-free operation with chemically resistant PTFE-coated diaphragms and stainless-steel valve plates—compatible with mild organic solvents, acids, and bases.
- Integrated vacuum regulation via adjustable needle valve, enabling precise control over suction pressure without external controllers.
- Low-noise design (<50 dB[A] at 1 m), achieved through vibration-dampening feet, balanced motor assembly, and acoustic enclosure geometry—suitable for shared lab spaces and quiet-zone installations.
- Compact footprint (195 × 100 × 160 mm) and lightweight construction (3.5 kg) facilitate portability between fume hoods, gloveboxes, and analytical instrument stations.
- Thermally protected induction motor (160 W, 220 V / 50 Hz) with robust insulation class F windings and thermal cutoff for sustained reliability under variable load conditions.
- Standardized Ø8 mm barbed inlet port compatible with common silicone, Viton®, or Tygon® tubing; optional vacuum gauge port available for real-time pressure monitoring.
Sample Compatibility & Compliance
The CM25 is validated for use with non-corrosive and mildly aggressive vapors typical in pharmaceutical formulation (e.g., ethanol, acetone, dichloromethane), environmental sample preparation (e.g., water extraction, SPE), and academic chemistry labs. Its dry-running mechanism avoids cross-contamination risks associated with oil-lubricated pumps—making it suitable for applications requiring trace-level purity, including headspace GC sample introduction and vacuum-assisted crystallization. While not certified to ATEX or IECEx standards for explosive atmospheres, the pump complies with GB/T 10889–2006 (Chinese national standard for diaphragm vacuum pumps) and meets CE-equivalent electromagnetic compatibility (EMC) and low-voltage directive requirements per manufacturer declaration. It supports documentation practices aligned with FDA 21 CFR Part 11 when paired with compliant data loggers for audit-trail generation.
Software & Data Management
The CM25 operates as a standalone analog device without embedded firmware or digital interfaces. However, its vacuum regulation capability enables seamless integration with third-party pressure transducers (e.g., capacitive or piezoresistive sensors) and programmable logic controllers (PLCs) for closed-loop vacuum control in automated workflows. When used with USB-connected vacuum gauges and LabVIEW™ or Python-based acquisition scripts, users can log time-stamped pressure profiles for process validation, SOP adherence tracking, and QC batch records. The pump’s mechanical simplicity ensures long-term calibration stability—no software updates, firmware patches, or cybersecurity considerations are required during its operational lifecycle.
Applications
- Routine solvent evaporation using rotary evaporators (up to 2 L flasks).
- Vacuum filtration of biological suspensions, precipitates, or particulate-laden water samples.
- Deaeration of resins, adhesives, and polymer solutions prior to casting or molding.
- Supporting vacuum desiccation in moisture-sensitive material storage (e.g., hygroscopic standards, reference materials).
- Gas sampling and pre-concentration in ambient air monitoring setups.
- Backing high-vacuum systems (e.g., diffusion or turbomolecular pumps) where oil-free foreline protection is mandatory.
FAQ
What is the maximum continuous duty cycle for the CM25 pump?
The CM25 is rated for indefinite continuous operation under ambient temperatures ≤35°C and relative humidity ≤80%, provided adequate ventilation is maintained around the motor housing.
Can this pump handle water vapor or condensable vapors?
Yes—its diaphragm design tolerates incidental water vapor ingress; however, prolonged exposure to saturated steam or high-volume condensate requires installation of a cold trap or inline condenser to prevent diaphragm fatigue.
Is the inlet port compatible with standard vacuum hose fittings?
Yes—the Ø8 mm barbed inlet accepts standard 1/4″ (6.35 mm) ID silicone or fluoropolymer tubing secured with stainless-steel hose clamps.
Does the pump include a built-in vacuum gauge?
No—a separate analog or digital vacuum gauge must be installed downstream if real-time pressure readout is required.
What maintenance intervals are recommended?
No scheduled maintenance is required; periodic visual inspection of diaphragm integrity and inlet filter cleanliness every 6 months is advised for optimal longevity.
