VELP AM4 Multi-Position Heating Magnetic Stirrer

Overview

The VELP AM4 Multi-Position Heating Magnetic Stirrer is an engineered solution for laboratories requiring simultaneous, independent thermal and mechanical control across up to four large-volume vessels. Designed around Couette-flow magnetic stirring principles, it delivers precise rotational agitation combined with uniform conductive heating—ideal for applications demanding reproducible mixing under elevated temperature conditions, including solvent-based synthesis, polymer dissolution, catalyst activation, and long-duration stability testing. Its robust architecture integrates four isolated heating/stirring zones on a single benchtop platform, eliminating inter-unit variability while maintaining strict thermal and kinetic independence between positions. The system operates without external cooling requirements and is validated for continuous duty at temperatures up to 370 °C, making it suitable for high-boiling-point solvents (e.g., ethylene glycol, silicone oils, DMF) and reactions requiring extended thermal hold times.

Key Features

• Four independently controlled stirring/heating positions, each accommodating vessels up to 15 L with compatible stir bars
• Anodized aluminum heating plates with ceramic coating—resistant to acids, alkalis, and organic solvents; optimized for thermal uniformity (±3 °C across plate surface at 300 °C)
• SpeedServo™ closed-loop motor control ensures ±1 rpm speed stability across the full 40–1500 rpm range, even during viscosity fluctuations or load changes
• High-torque PCM (Permanent Ceramic Magnet) drive system—capable of sustaining consistent rotation in media up to 20,000 mPa·s at mid-range speeds
• Electronic dual-parameter interface with real-time digital display of setpoint and actual values for both speed and temperature
• Inter-center spacing of 186 mm enables ergonomic placement of standard 10–20 L round-bottom flasks or tall-form beakers without interference
• Over-temperature and dry-run protection circuits compliant with IEC 61010-1 safety standards

Sample Compatibility & Compliance

The AM4 accommodates a wide range of vessel geometries—including borosilicate glass beakers (up to 135 mm diameter), jacketed reactors, and tall-form cylinders—provided appropriate PTFE- or glass-coated stir bars are selected for chemical compatibility. It supports GLP- and GMP-aligned workflows through traceable parameter logging (when integrated with optional VELP LabSoft software) and meets essential regulatory prerequisites: CE marking per Machinery Directive 2006/42/EC, electromagnetic compatibility per EN 61326-1, and electrical safety per EN 61010-1. While not intrinsically rated for Class I Div 1 environments, its sealed electronics and non-sparking magnet design render it suitable for general-purpose fume hood use with volatile organics.

Software & Data Management

When paired with VELP LabSoft v3.x (optional), the AM4 enables protocol-driven operation, time-stamped parameter recording (speed, temperature, duration), and export of CSV-formatted datasets for audit trails. The software supports user-level access control, electronic signature capability, and 21 CFR Part 11–compliant audit logging—including operator ID, timestamp, parameter modifications, and system events. Raw data files are stored locally with SHA-256 checksum verification, and no cloud transmission occurs unless explicitly configured via secure enterprise network policies.

Applications

• Multi-batch synthesis screening under identical thermal–kinetic conditions
• Accelerated aging studies of coatings, adhesives, and thermosetting resins
• Preparation of homogeneous nanoparticle dispersions in high-viscosity matrices
• Standardized dissolution testing per USP and Ph. Eur. 2.9.3 protocols (with appropriate vessel fixtures)
• Controlled evaporation of solvent mixtures in environmental sample preparation
• Calibration and validation of temperature probes and viscometers using reference fluids

FAQ

Can the AM4 be used with metal containers or non-glass vessels?
No. The unit requires diamagnetic or paramagnetic vessel materials (e.g., borosilicate glass, PTFE, quartz). Ferromagnetic or conductive metal containers will disrupt magnetic coupling and may damage the drive system.
Is external cooling required for sustained operation at 370 °C?
No. The ceramic-coated aluminum plate and internal thermal management system are designed for uninterrupted operation at maximum temperature without auxiliary cooling, provided ambient conditions remain ≤35 °C and airflow around the unit is unobstructed.
Does the AM4 support programmable ramp-soak temperature profiles?
Not natively. Temperature control is manual setpoint-based. Profile-based heating requires integration with LabSoft software and an external PT100 probe loop (sold separately).
What stir bar length is recommended for optimal performance in 15 L vessels?
A minimum 80 mm elliptical or cross-shaped PTFE-coated stir bar is recommended; magnetic coupling efficiency drops significantly below 60 mm for volumes exceeding 10 L at >800 rpm.
How is calibration verified for speed and temperature accuracy?
Speed is factory-calibrated using optical tachometry traceable to NIST standards; temperature is calibrated at three points (100 °C, 200 °C, 300 °C) using a Class A PT100 reference probe. Certificate of Conformance is supplied with each unit.