WIGGENS WH200 Heating Magnetic Stirrer

Overview

The WIGGENS WH200 Heating Magnetic Stirrer is a precision-engineered laboratory instrument designed for reproducible temperature-controlled mixing of low-to-medium viscosity aqueous and organic solutions. It operates on the principle of magnetic coupling: a rotating permanent magnet beneath the heating plate induces synchronous rotation of a PTFE- or glass-coated stir bar immersed in the sample vessel. Simultaneous resistive heating of the anodized aluminum plate enables accurate thermal regulation across the working surface. Engineered for daily use in academic, pharmaceutical, and industrial QC laboratories, the WH200 delivers stable thermal and rotational performance under continuous operation—without mechanical drive shafts or exposed moving parts. Its compact footprint and sealed enclosure support compliance with general laboratory safety protocols and routine GLP documentation requirements.

Key Features

• Microprocessor-based control system with integrated PID algorithm ensures high thermal stability (±1 °C) when used with optional external Pt100 probe (not included)
• High-brightness LED display showing real-time setpoints and actual values for both speed (rpm) and plate temperature (°C)
• Auto-memory function retains last-used parameters after power cycling—reducing setup time for standardized protocols
• Integrated drip channel above control panel prevents liquid ingress during accidental spills; conforms to IEC 61010-1 contamination protection class IP21
• Thermal cut-off activation at 280 °C (plate surface) triggers audible/visual alarm (E02 error code) and halts heating—meeting essential safety thresholds per EN 61010-1
• Anodized aluminum heating plate offers uniform heat distribution, corrosion resistance, and rapid thermal response (typical ramp rate: ~10 °C/min from ambient to 200 °C)
• Rugged housing with recessed rotary controls minimizes mechanical wear and supports long-term reliability in shared lab environments

Sample Compatibility & Compliance

The WH200 accommodates standard laboratory glassware up to 2 L capacity—including beakers, Erlenmeyer flasks, and jacketed reactors—when paired with appropriately sized stir bars (e.g., 30–40 mm cross-shaped or oval types). It is compatible with water, ethanol, acetone, buffer solutions, and low-viscosity polymer dispersions (≤500 mPa·s). Not recommended for highly viscous media (>1000 mPa·s), abrasive slurries, or applications requiring inert atmosphere control. The device complies with IEC 61010-1 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use) and EN 61326-1 (EMC requirements for laboratory instrumentation). While not intrinsically safe, its design meets general-purpose electrical safety standards applicable to non-hazardous area installations.

Software & Data Management

The WH200 operates as a standalone analog-digital hybrid instrument without proprietary software or USB/RS232 connectivity. All operational parameters are configured locally via dual rotary knobs and verified on the front-panel LED display. No data logging, remote control, or audit trail functionality is provided—consistent with Class I benchtop stirrers intended for manual process execution. For laboratories requiring electronic records per FDA 21 CFR Part 11 or ISO/IEC 17025, external validation of parameter settings (e.g., calibrated thermometer + tachometer verification) and manual logbook entry remain standard practice. The unit’s deterministic behavior and repeatable setpoint accuracy support traceable method validation when incorporated into SOP-defined workflows.

Applications

• Buffer and reagent preparation in molecular biology and clinical diagnostics labs
• Solution homogenization prior to pH measurement, titration, or spectroscopic analysis
• Accelerated dissolution testing of solid dosage forms (e.g., USP Apparatus II simulation at fixed T and rpm)
• Pre-crystallization mixing in small-scale API synthesis and purification steps
• Heating and agitation of culture media in microbiology incubation workflows
• Standardized sample conditioning for rheological pre-testing or particle dispersion stability assessment

FAQ

Does the WH200 support external temperature feedback control?
Yes—when connected to an optional Pt100 sensor (sold separately), the unit can regulate based on medium temperature rather than plate surface temperature, improving accuracy for deep or insulated vessels.
What is the maximum recommended operating time at 250 °C?
Continuous operation at maximum plate temperature is rated for ≤4 hours per cycle; extended use requires ≥30-minute cooldown intervals to maintain thermal sensor longevity and prevent housing deformation.
Can the WH200 be used with metal stir bars?
No—only PTFE-, glass-, or ceramic-coated stir bars are permitted; bare metal bars may corrode, contaminate samples, or demagnetize at elevated temperatures.
Is calibration certificate included with shipment?
No factory calibration certificate is supplied; users must perform initial verification using NIST-traceable thermometers and optical tachometers per internal QA procedures.
How is overtemperature protection triggered?
The E02 fault activates if either the internal plate sensor exceeds 280 °C OR—if a Pt100 probe is installed—the measured medium temperature exceeds the setpoint by >50 °C.