VELP MULTISTIRRER Digital Multi-Position Magnetic Stirrer

Overview

The VELP MULTISTIRRER is a precision-engineered digital multi-position magnetic stirrer designed for reproducible, synchronized agitation across up to six independent vessels simultaneously. Utilizing permanent magnet coupling and brushless DC motor technology, it delivers consistent torque transfer without mechanical wear—ideal for extended unattended operation in quality control laboratories, biotechnology workflows, and academic research settings. Unlike single-station units, the MULTISTIRRER integrates a centralized SpeedServo™ feedback system that continuously monitors and adjusts rotational output to maintain set speed regardless of viscosity fluctuations or load asymmetry. Its ambient-only operational design (no integrated heating or cooling) ensures compatibility with external thermal management systems—including recirculating chillers and water baths—enabling precise temperature-controlled stirring in compliance with ISO 17025 and GLP-aligned protocols.

Key Features

• Multi-Position Synchronization: Six independently controllable stirring positions operate at identical or user-defined speeds, eliminating inter-vessel variability critical for parallel assays and replicate sample preparation.
• SpeedServo™ Electronic Control: Closed-loop microprocessor regulation ensures ±1% speed accuracy across the full 80–1500 rpm range—even at low speeds (e.g., 100 rpm) where conventional stirrers exhibit drift or stalling.
• Digital LED Interface: High-contrast, backlit display provides real-time rpm readout per position; intuitive rotary encoder enables tactile speed adjustment without menu navigation.
• Programmable Onboard Timer: Supports both forward and reverse countdown modes (00:01–99:59), enabling timed endpoint agitation for standardized enzymatic reactions or titration protocols.
• Ergonomic Stainless Steel Platform: Low-profile 3 mm-thick AISI 304 panel resists chemical corrosion and thermal deformation; optimized height minimizes wrist fatigue during manual vessel loading/unloading.
• Thermally Stable Architecture: Passive heat dissipation design maintains surface temperature ≤35°C after 72 h continuous operation at 1200 rpm—verified per IEC 61010-1 safety standards.

Sample Compatibility & Compliance

The MULTISTIRRER accommodates standard laboratory glassware (beakers, flasks, vials) with diameters from 25 mm to 100 mm. Its non-magnetic base construction prevents interference with adjacent analytical instruments (e.g., NMR spectrometers or mass spectrometers). While the unit itself lacks integrated temperature regulation, its electrical isolation and grounding compliance (EN 61326-1) permit safe integration into temperature-controlled environments using external recirculating baths (e.g., Julabo F25 or Huber CC-K). The device meets CE marking requirements for laboratory equipment and conforms to electromagnetic compatibility (EMC) Class B limits for use in non-industrial settings per EN 55011.

Software & Data Management

As a standalone analog-digital hybrid instrument, the MULTISTIRRER does not feature USB or Ethernet connectivity. However, its timer and speed settings are fully auditable via mechanical logbook entries or optional external data loggers (e.g., Omega OM-DAQPRO-5300). For regulated environments requiring electronic records, users may integrate the unit into validated workflows by pairing it with 21 CFR Part 11-compliant LIMS platforms via time-stamped operator logs and batch-specific parameter documentation. All configuration changes are manually recorded, supporting traceability under ISO/IEC 17025 Clause 7.7.

Applications

• Parallel preparation of culture media in microbiology labs (e.g., Mueller-Hinton agar dissolution prior to autoclaving).
• Synchronized pH adjustment across multiple titration vessels in QC testing of pharmaceutical excipients (USP <797>).
• Homogenization of nanoparticle suspensions in materials science—where shear-sensitive dispersion requires consistent low-speed agitation (120–300 rpm).
• Enzyme kinetics studies requiring precise reaction initiation via timed stir-on command (e.g., lactate dehydrogenase activity assays).
• Buffer equilibration for HPLC mobile phase preparation, where oxygen degassing benefits from prolonged low-shear mixing.

FAQ

Does the MULTISTIRRER include a built-in heating plate?
No. It is a non-heating magnetic stirrer designed exclusively for agitation. Temperature control must be achieved externally using compatible water baths or chillers.
Can individual positions be operated at different speeds?
Yes. Each of the six positions supports independent speed selection within the 80–1500 rpm range, with synchronized start/stop capability.
Is the unit suitable for viscous solutions such as polymer melts or glycerol-based buffers?
It maintains rated torque up to 1500 cP at 800 rpm; for higher-viscosity applications (>5000 cP), use of high-strength PTFE-coated stir bars and reduced speed (≤400 rpm) is recommended.
What safety certifications does the MULTISTIRRER hold?
CE-marked per Directive 2014/30/EU (EMC) and 2014/35/EU (LVD); compliant with IEC 61010-1:2010 for laboratory electrical equipment.
How is calibration verified for speed accuracy?
Users may validate performance using an external optical tachometer; VELP provides factory calibration certificates traceable to NIST standards upon request (additional service).