Hanuo JJ-1BA Digital Constant-Speed Electric Stirrer

Overview

The Hanuo JJ-1BA Digital Constant-Speed Electric Stirrer is an engineered laboratory stirring solution designed for reproducible, stable mixing of low-to-high-viscosity liquids under continuous operation. Based on direct-drive rotary torque transmission and precision gear-reduction mechanics, the JJ-1BA delivers consistent rotational energy transfer without speed drift—critical for applications requiring defined shear history, such as polymer dissolution, suspension homogenization, buffer preparation, or reagent blending in analytical and quality control labs. Its cantilevered support architecture isolates the motor housing from liquid ingress while enabling vertical alignment stability across varying vessel geometries (e.g., beakers, flasks, and jacketed reactors). Unlike portable handheld stirrers, the JJ-1BA is strictly intended for bench-mounted use with a rigid support stand—ensuring mechanical integrity and operator safety during extended runs.

Key Features

• Digitally displayed real-time rotational speed (RPM) with ±2% full-scale accuracy across both speed ranges
• Two-stage gear-shift mechanism offering dual operational modes: low-speed high-torque (60–500 rpm) and high-speed moderate-torque (240–2000 rpm), optimized for viscosity-dependent process requirements
• 120 W brushless motor with spark-free operation, delivering sustained torque output of 1850 g·cm and thermal resilience for uninterrupted 8+ hour duty cycles
• Cantilevered structural design with enlarged heat-dissipating surface area to maintain motor temperature rise below 45 °C during continuous operation at maximum load
• Stainless steel (AISI 304) stirring rod and impeller assembly, resistant to corrosion from aqueous, mildly acidic, and alkaline media
• Universal keyless chuck accommodating shaft diameters from 0.5 mm to 10 mm—compatible with standard paddle, propeller, and anchor-type agitators
• 2-meter reinforced power cord with integrated grounding conductor, conforming to IEC 61000-6-3 EMC emission standards

Sample Compatibility & Compliance

The JJ-1BA supports mixing of Newtonian and pseudo-plastic fluids within a dynamic viscosity range of 0–10,000 mPa·s—covering water, glycerol solutions, CMC suspensions, and low-MW polymer melts. It is validated for use with glass, stainless steel, and PTFE-lined vessels up to 20 L capacity (water-equivalent volume). While not intrinsically rated for explosive atmospheres (ATEX/IECEx), its spark-free motor design reduces ignition risk in non-hazardous lab environments. The unit complies with GB/T 2900.72–2013 (Chinese national standard for electric laboratory equipment safety) and meets basic electromagnetic compatibility per CISPR 11 Group 1, Class B. For GLP/GMP-regulated workflows, the digital RPM display enables manual logging of process parameters; however, it does not include audit-trail-capable firmware or 21 CFR Part 11-compliant electronic records.

Software & Data Management

The JJ-1BA operates as a standalone analog-electronic instrument with no embedded microcontroller, network interface, or software dependency. All operational parameters—including selected speed range, actual RPM, and power-on duration—are monitored via front-panel LED digits and mechanical controls. No drivers, configuration utilities, or data export functions are provided. Users record operational settings manually in lab notebooks or integrate external data loggers via optional analog tachometer signal taps (0–5 V DC proportional to RPM, available upon request with accessory kit). Firmware updates or remote diagnostics are not applicable.

Applications

• Preparation of homogeneous aqueous and organic solutions in pharmaceutical QC labs (e.g., dissolution medium conditioning per USP <711>)
• Mixing of cell culture media and buffered saline solutions in life science research settings
• Dispersion of nanoparticles and pigment suspensions in materials science laboratories
• Viscosity-sensitive reactions requiring controlled agitation, including esterification, hydrolysis, and emulsion formation
• Standardized stirring protocols for ASTM D1209 (color measurement), ASTM D189 (carbon residue), and ISO 4618 (paint drying tests)
• Supporting gravimetric calibration of volumetric flasks and pipettes through uniform solution homogenization prior to dispensing

FAQ

Is the JJ-1BA suitable for use in fume hoods or inert-atmosphere gloveboxes?
Yes—its sealed motor housing and absence of ventilation grilles permit safe operation in ventilated enclosures; however, ambient temperature must remain within 10–40 °C for rated performance.
Can the stirrer be used with magnetic stir bars?
No—the JJ-1BA is a mechanical overhead stirrer and does not incorporate magnetic coupling; it requires direct-shaft impeller attachment.
What maintenance is required for long-term reliability?
Annual inspection of chuck jaw integrity and lubrication of gear train (using lithium-based NLGI #2 grease) is recommended; motor bearings are pre-greased for lifetime service.
Does the unit include a support stand or clamping hardware?
No—mounting hardware (e.g., universal clamp, support rod, and base) must be sourced separately per user-defined bench configuration.
Is overload protection built into the motor circuit?
Yes—a thermal cut-off switch interrupts power if internal winding temperature exceeds 120 °C, resetting automatically upon cooldown.