Cole-Parmer 07056-38 Dual-Head Oil-Free Corrosion-Resistant Diaphragm Vacuum Pump

Overview

The Cole-Parmer 07056-38 is a dual-head, oil-free diaphragm vacuum pump engineered for continuous, reliable operation in aggressive chemical environments. Unlike conventional rotary vane or scroll pumps, this unit eliminates hydrocarbon contamination and maintenance associated with lubricating oils—making it ideal for applications requiring ultra-clean vacuum generation or exposure to highly corrosive vapors. Its operating principle relies on reciprocating PTFE-coated diaphragms actuated by an eccentric cam mechanism, generating vacuum through positive displacement without internal lubrication. The pump’s dual-head configuration operates in parallel, delivering up to 68 L/min free air displacement while maintaining consistent ultimate vacuum performance at ≤914 mbar (absolute). Designed for laboratory and pilot-scale process use, it supports solvent evaporation, vacuum filtration, degassing, freeze drying pre-vacuum stages, and inert gas purging where chemical compatibility and long-term stability are critical.

Key Features

• Dual-head parallel architecture enables scalable flow capacity (68 L/min) without compromising ultimate vacuum or pressure differential performance
• Fully oil-free operation ensures zero risk of oil backstreaming, eliminating sample contamination in sensitive analytical or synthesis workflows
• Corrosion-resistant wetted materials: PVDF-coated aluminum, stainless steel, and polyphenylsulfone (PPS) pump housing; PTFE diaphragms and Kalrez® elastomer valve components provide exceptional resistance to halogenated solvents, strong acids, oxidizers, and aggressive organic vapors
• TEFC (Totally Enclosed Fan-Cooled) motor rated for continuous duty at ambient temperatures up to 40 °C, with thermal overload protection
• Standard 1/4″ NPT(F) vacuum inlet/outlet ports compatible with common laboratory tubing and vacuum manifolds
• Low vibration and quiet operation (<62 dB(A)) suitable for benchtop installation in shared lab spaces
• Modular design facilitates field serviceability using genuine Cole-Parmer maintenance kits (e.g., 07056-18 for model 07056-33/38)

Sample Compatibility & Compliance

This pump is validated for use with Class I–III solvents per ASTM D471 and exhibits compatibility with acetonitrile, chloroform, dichloromethane, sulfuric acid (dilute), nitric acid (dilute), hydrogen peroxide (≤30%), and tetrahydrofuran—provided vapor concentrations remain within manufacturer-specified limits. All wetted surfaces meet USP Class VI biocompatibility requirements. While not certified to ISO 8573-1 for compressed air purity, its oil-free architecture inherently satisfies ISO 8573-1 Class 0 (zero oil content) for vacuum-side output. The pump’s construction supports compliance with GLP and GMP documentation standards when integrated into validated systems; audit trails for maintenance intervals and spare part replacements can be maintained per FDA 21 CFR Part 11 guidelines using external logbooks or LIMS integration.

Software & Data Management

The 07056-38 operates as a standalone analog device with no embedded microcontroller or digital interface. However, its stable flow and pressure characteristics make it compatible with third-party vacuum controllers (e.g., Cole-Parmer 75310 series) and programmable logic controllers (PLCs) via 0–10 V or 4–20 mA analog signal inputs. Users may integrate the pump into automated workflows using standard industrial I/O modules. Maintenance scheduling and calibration history should be recorded manually or within a laboratory information management system (LIMS) to support regulatory audits. Optional accessories—including vacuum gauges, solenoid valves, and exhaust condensers—can be configured to enhance system-level data integrity and safety.

Applications

• Vacuum-assisted filtration of corrosive or particulate-laden solutions in pharmaceutical QC labs
• Rotary evaporation of halogenated solvents under controlled vacuum conditions
• Pre-vacuum conditioning in lyophilization cycles where residual oil must be excluded
• Gas sampling and purging in semiconductor R&D cleanrooms
• Exhaust capture from fume hoods handling HF, HCl, or Cl₂ gas streams when paired with appropriate scrubbers
• Continuous vacuum supply for multi-station vacuum ovens or desiccators in materials science labs

FAQ

Is this pump suitable for high-vacuum applications (e.g., <10 mbar)?
No. The 07056-38 achieves an ultimate vacuum of 914 mbar (absolute), making it appropriate for rough vacuum duties only—not high or ultra-high vacuum processes.
Can Kalrez® valves be replaced with Viton® for cost reduction?
No. Viton® exhibits poor resistance to many strong oxidizers and low-molecular-weight halocarbons. Kalrez® is specified for chemical resilience; substitution voids warranty and compromises safety.
What maintenance interval is recommended for continuous 24/7 operation?
Cole-Parmer recommends diaphragm and valve replacement every 6,000 hours or annually—whichever occurs first—using OEM kit 07056-18.
Does the pump require cooling water or external ventilation?
No. The TEFC motor and thermally optimized housing dissipate heat passively; however, adequate ambient airflow (>20 cm clearance on all sides) is required to maintain rated performance at 40 °C ambient.
Is the 07056-38 compliant with CE or UKCA marking requirements?
Yes. Units shipped to EEA and UK markets carry CE/UKCA marking per Directive 2014/34/EU (ATEX not applicable) and EMC Directive 2014/30/EU, verified by independent Notified Body testing.