CZGY JJ-2QE Heavy-Duty Constant-Speed Electric Stirrer

Overview

The CZGY JJ-2QE Heavy-Duty Constant-Speed Electric Stirrer is an engineered solution for laboratory-scale mixing and dispersion tasks requiring high torque at low rotational speeds. Designed around a precision pulse-step motor architecture, the stirrer delivers consistent angular velocity across its full 5–500 rpm operating range—without speed droop under load. This capability stems from the motor’s inherent torque retention profile, which remains effective even when agitating highly viscous media such as polymer melts, asphalt emulsions, or concentrated suspensions (up to ~10⁵ mPa·s viscosity range, depending on impeller geometry and vessel configuration). Unlike conventional AC or brushed DC motors, the pulse-step drive eliminates reliance on mechanical commutation or variable-frequency inverters, thereby enhancing long-term operational stability and reducing maintenance intervals. The unit operates on standard 220 V / 50 Hz mains power and integrates a dedicated digital speed controller with real-time RPM feedback and closed-loop regulation—ensuring repeatable process conditions essential for method transfer and regulatory compliance.

Key Features

• High-torque pulse-step motor delivering stable 5 rpm operation with no stall risk under viscous loads
• Digital constant-speed controller with LED display, intuitive rotary knob interface, and tactile button controls
• Power-off memory function: retains last-used speed and timer settings after interruption or shutdown
• Adjustable timer with 1-minute resolution across 0–9990 minute range (up to 166.5 hours), supporting unattended extended-duration experiments
• Robust aluminum alloy housing with IP20-rated enclosure for laboratory benchtop use
• Interchangeable stainless steel stirring shafts (standard Ø10 mm, optional Ø8 mm or Ø12 mm) compatible with common lab clamps and universal joints
• No external cooling fan required—motor thermal management achieved via passive convection and duty-cycle optimized drive electronics

Sample Compatibility & Compliance

The JJ-2QE supports mixing of aqueous, organic, and semi-solid formulations in glass, stainless steel, or polypropylene vessels ranging from 100 mL to 3 L nominal volume. Its low-speed torque profile enables homogeneous dispersion of particulates in high-viscosity matrices without excessive shear-induced degradation—making it suitable for applications including catalyst slurry preparation, pharmaceutical suspension blending, and polymer solution homogenization. The device complies with IEC 61010-1:2010 safety requirements for electrical equipment used in laboratory environments. While not certified for hazardous area use (e.g., ATEX or IECEx), it meets general-purpose lab safety standards applicable to non-explosive atmospheres. All electrical components are rated for continuous duty at ambient temperatures of 5–40 °C and relative humidity ≤80% non-condensing.

Software & Data Management

The JJ-2QE operates as a standalone instrument without proprietary software dependencies. All operational parameters—including setpoint speed, elapsed time, and remaining timer duration—are displayed locally on the integrated LED screen. No data logging, USB export, or PC connectivity is provided; however, the unit’s deterministic behavior and power-off memory ensure reproducibility across user sessions without reliance on external recordkeeping systems. For GLP/GMP-aligned workflows, users may document speed/timer settings manually in lab notebooks or integrate usage logs into electronic lab notebook (ELN) platforms via standard observational entry. The absence of firmware-updatable components eliminates cybersecurity concerns associated with networked instruments and simplifies audit readiness during FDA 21 CFR Part 11 or ISO/IEC 17025 assessments.

Applications

• Preparation of high-viscosity calibration standards for rheometers and viscometers
• Homogenization of pigment dispersions in coating and ink R&D
• Mixing of hydrogel precursors prior to crosslinking reactions
• Blending of API-excipient blends in early-phase solid dosage form development
• Stirring of bituminous binders and asphalt emulsion samples per ASTM D140/D6377 protocols
• Controlled agitation during dissolution testing of extended-release tablets (USP Apparatus 2 adaptation possible with custom shaft mounting)

FAQ

What is the minimum controllable speed, and does torque remain consistent at that setting?
The JJ-2QE maintains precise 5 rpm rotation with full motor torque output—verified under load conditions up to 3 L of glycerol-water mixtures (η ≈ 800 mPa·s) using a standard 40 mm paddle impeller.
Is the timer programmable in seconds or only minutes?
Timer resolution is 1 minute; fractional-minute entries are not supported.
Can this stirrer be mounted on a standard laboratory clamp stand?
Yes—the vertical shaft features a standardized 10 mm diameter smooth section compatible with common universal clamps and extension rods.
Does the unit support external analog or digital control signals (e.g., 0–10 V, RS-232)?
No. The JJ-2QE is a manually operated, self-contained instrument with no external control interface.
What is the expected service life of the pulse-step motor under continuous operation?
Rated for ≥10,000 hours of cumulative operation under typical lab duty cycles (≤8 hrs/day, ambient temperature ≤35 °C).