Cole-Parmer 04634-00 Pneumatic & Hydraulic Magnetic Stirrer

Overview

The Cole-Parmer 04634-00 Pneumatic & Hydraulic Magnetic Stirrer is a non-electric, intrinsically safe laboratory stirring solution engineered for operation in hazardous environments where spark-free performance is mandatory—such as solvent-rich fume hoods, chemical synthesis labs, pharmaceutical cleanrooms, and industrial process development areas subject to ATEX or IECEx classification. Unlike conventional electric stirrers, this unit eliminates all electrical components from the operational zone; instead, it converts compressed air (≥8 psi) or pressurized water (≥12 psi, supplied via a dedicated pump loop) into rotary motion through a precision-engineered fluid-powered turbine mechanism. The resulting torque drives a permanent magnet rotor beneath a chemically inert polypropylene top plate, enabling contactless coupling with standard magnetic stir bars placed inside vessels. This design ensures zero electromagnetic interference, no heat generation at the drive interface, and full compatibility with conductive, corrosive, or temperature-sensitive media.

Key Features

• Intrinsically safe operation: No motors, wiring, or electronic controls in proximity to the sample—meets requirements for Class I, Division 1/2 and Zone 0/1 hazardous locations.
• Chemically resistant PP top plate (12.7 cm diameter) provides excellent resistance to acids, bases, alcohols, and halogenated solvents—ideal for aggressive reagent handling.
• Adjustable speed control via external pneumatic/hydraulic pressure regulation delivers stable rotational output from 0 to 800 rpm with high reproducibility across repeated runs.
• Compact footprint (6.7 × 12.7 cm) enables integration into confined spaces including gloveboxes, biosafety cabinets, and modular reactor systems.
• Standard tubing configuration includes 1.8 m inlet line (4.1 mm ID) for connection to facility air/water supply and 0.3 m outlet line (9.1 mm ID) for exhaust or recirculation routing.
• No lubrication required; turbine and bearing assembly designed for long-term dry-run durability under regulated pressure conditions.

Sample Compatibility & Compliance

This stirrer supports standard glass, stainless steel, and plastic vessels up to 500 mL capacity when used with appropriately sized magnetic stir bars (e.g., 20–40 mm cross-shaped or oval types). It is compatible with low-viscosity aqueous solutions, organic solvents, suspensions, and mildly viscous polymer solutions (<500 mPa·s at 25°C). The device conforms to general laboratory safety principles outlined in ANSI Z9.5 and ISO 15195 for non-electrical equipment in controlled environments. While not certified to UL/CSA standards as a standalone electrical device, its absence of power input renders it exempt from such certification—making it suitable for use under GLP and GMP-aligned workflows where documentation of hazard mitigation is required.

Software & Data Management

The 04634-00 operates without embedded firmware, software, or digital interfaces. Speed is controlled manually via upstream pressure regulators; therefore, no data logging, audit trails, or electronic validation is applicable. For laboratories operating under FDA 21 CFR Part 11 or EU Annex 11 requirements, this analog architecture simplifies qualification: only mechanical calibration (e.g., tachometer verification of rpm vs. pressure input) and material traceability (PP plate lot number, tubing specifications) need be documented. Routine maintenance consists solely of visual inspection of tubing integrity and periodic cleaning of the top plate surface—no firmware updates or cybersecurity protocols are necessary.

Applications

• Safe agitation of flammable solvent mixtures during extraction, crystallization, or reflux setups.
• Mixing in nitrogen-purged or vacuum-sealed reactors where electrical ingress is prohibited.
• Continuous blending in pilot-scale bioprocessing skids requiring explosion-proof auxiliary equipment.
• Stirring within environmental chambers or cold rooms where condensation compromises electrical reliability.
• Education and training labs emphasizing intrinsic safety principles in chemical engineering curricula.
• QC/QA testing of raw materials under cGMP conditions where equipment qualification must exclude electronic complexity.

FAQ

Is the 04634-00 compatible with vacuum environments?

Yes—provided the pneumatic/hydraulic supply lines are isolated from the vacuum chamber using appropriate check valves and pressure relief mechanisms. The stirrer itself contains no sealed cavities or elastomeric seals that could outgas or deform.
Can it be used with hot plates or heating mantles?

No—the unit is not rated for thermal exposure above 60°C ambient. It must be positioned outside heated zones; indirect vessel heating (e.g., via circulating baths or immersion heaters) is recommended.
What stir bar sizes are optimal for maximum efficiency at 500 mL?

A 35 mm cross-type stir bar (e.g., Cole-Parmer catalog #04634-10) provides optimal vortex formation and torque transfer across the full 0–800 rpm range in cylindrical glassware.
Does Cole-Parmer provide calibration certificates for this model?

Not as standard; however, third-party metrology labs can perform traceable rpm verification using optical tachometry against NIST-traceable references—documentation follows ISO/IEC 17025 guidelines.
Is replacement tubing available as a consumable?

Yes—Cole-Parmer offers compatible fluoropolymer-reinforced tubing (P/N 04634-20) rated for continuous 12 psi hydraulic service and intermittent 100 psi pneumatic surges.