Hanuo 99-1A High-Power Digital Temperature-Controlled Magnetic Stirrer

Overview

The Hanuo 99-1A is a high-power, digitally controlled magnetic stirrer engineered for reproducible mixing of low-to-medium viscosity liquids in laboratory and quality control environments. It operates on the principle of rotating magnetic coupling: a microprocessor-driven dual-pole electromagnetic drive beneath the ceramic-coated stainless steel plate generates a time-varying magnetic field, inducing synchronous rotation of a PTFE- or glass-coated magnetic stir bar immersed in the sample vessel. This non-contact torque transmission eliminates mechanical wear, shaft leakage risks, and contamination pathways—making it ideal for sealed reactions, sterile preparations, and solvent-based systems where inertness and cleanliness are critical. Unlike overhead stirrers or mechanical agitators, the 99-1A delivers consistent shear input across volumes up to 10 L without requiring vessel penetration or external clamping. Its design prioritizes thermal stability and speed linearity, with digital feedback control ensuring ±1 °C temperature accuracy and ±15 rpm speed repeatability under load.

Key Features

• Digital PID temperature control with real-time LED display (ambient to 100 °C), enabling precise thermal management during extended mixing protocols.
• Wide-speed range (0–2600 rpm) with smooth analog-style adjustment via rotary encoder—no stepwise increments—to accommodate both gentle suspension homogenization and vigorous emulsification.
• 600 W heating element integrated into a 30 × 30 cm ceramic-coated aluminum plate, offering uniform heat distribution and rapid thermal response (typical ramp rate: ~1.8 °C/min at 5 L water).
• Robust housing with reinforced ABS+PC casing, anti-slip rubber feet, and IP20-rated electrical protection suitable for standard laboratory benchtop use.
• Overheat protection circuitry automatically deactivates heating if surface temperature exceeds 120 °C or if no thermal load is detected for >120 seconds.
• Low-noise operation (<55 dB(A) at 1 m, 1500 rpm), minimizing acoustic interference in shared analytical workspaces.

Sample Compatibility & Compliance

The 99-1A supports glass, borosilicate, stainless steel, and polypropylene vessels ranging from 50 mL beakers to 10 L jacketed reactors. Compatible stir bars include cylindrical (20–80 mm), oval (30–60 mm), and cross-shaped designs (for high-viscosity media). The unit complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and meets RoHS 2011/65/EU restrictions on hazardous substances. While not certified for Class I Div 1 hazardous locations, its sealed electronics and absence of sparking components make it suitable for use with flammable solvents when operated within manufacturer-recommended ventilation guidelines (e.g., fume hood use for volatile organics). No intrinsic safety rating is assigned; users must assess compatibility with local EH&S policies prior to deployment in regulated GMP/GLP workflows.

Software & Data Management

The 99-1A operates as a standalone instrument without embedded data logging or PC connectivity. All setpoints and operational status are displayed locally via a 4-digit red LED screen. For laboratories requiring audit trails or electronic records per FDA 21 CFR Part 11 or ISO/IEC 17025, external validation protocols—including independent thermocouple verification, speed calibration using optical tachometry, and periodic performance qualification (PQ)—must be implemented manually. The device supports integration into broader lab infrastructure via analog signal output (0–5 V DC) for temperature and speed monitoring when paired with third-party DAQ systems (not included).

Applications

• Preparation of buffer solutions, culture media, and reagent dilutions in molecular biology and clinical diagnostics labs.
• Homogenization of polymer solutions, nanoparticle suspensions, and colloidal dispersions prior to DLS or SEM analysis.
• Heated dissolution testing of pharmaceutical tablets per USP , particularly for sink condition maintenance in 900 mL vessels.
• Controlled synthesis of metal-organic frameworks (MOFs) and covalent organic frameworks (COFs) requiring prolonged, temperature-stabilized agitation.
• Environmental sample digestion (e.g., EPA Method 3050B) involving HNO₃/HF mixtures at elevated temperatures under reflux conditions.

FAQ

Does the 99-1A support external temperature probe input for vessel internal monitoring?
No—the unit relies solely on built-in plate surface sensing. For internal solution temperature tracking, a separate calibrated probe and readout system must be used.
Can the stirrer maintain 100 °C continuously for >8 hours?
Yes, provided ambient temperature remains ≤25 °C and airflow around the unit is unobstructed; continuous operation at maximum temperature may reduce long-term heater lifespan.
Is the ceramic coating resistant to hydrofluoric acid (HF) exposure?
No—HF etches silica-based ceramics. Avoid direct contact with HF-containing solutions; use secondary containment or alternative heating methods.
What is the recommended stir bar size for optimal performance at 10 L volume?
A 60 mm × 15 mm cylindrical PTFE-coated stir bar is validated for uniform mixing at 10 L in standard cylindrical vessels (diameter ≥18 cm).
Does Hanuo provide IQ/OQ documentation templates for this model?
Standard factory documentation includes a Certificate of Conformance and basic operating instructions. Custom IQ/OQ templates are available upon request through authorized distributors—not directly from Hanuo’s Shanghai office.