CZGY DJ-100W Digital Display Constant-Speed Electric Stirrer

Overview

The CZGY DJ-100W Digital Display Constant-Speed Electric Stirrer is an entry-level yet robust benchtop mixing solution engineered for reproducible, low-to-medium viscosity liquid homogenization in academic laboratories, QC testing environments, and small-scale R&D settings. It operates on the principle of mechanical rotational agitation via a precision-controlled brushless DC motor, delivering consistent torque across its full speed range without thermal drift or commutation noise. Unlike gear-driven or universal-motor-based stirrers, the DJ-100W eliminates carbon brush wear, ensuring long-term speed stability and reduced maintenance intervals. Its fixed-speed architecture—combined with digital feedback control—makes it especially suitable for applications requiring sustained, unattended operation over extended durations (e.g., dissolution testing, buffer preparation, or polymer solution conditioning), where repeatability between runs is prioritized over dynamic speed profiling.

Key Features

• Brushless DC motor with dual-loop (speed + current) closed-loop control for high-speed stability and load compensation
• Digital LED display showing real-time RPM and elapsed timer value; intuitive rotary encoder interface for parameter input
• Adjustable vertical and horizontal positioning: stainless steel support column with locking collar, reinforced cross-arm with fine-tuning nut for precise impeller alignment
• Wide operational speed range (40–1400 rpm) optimized for both gentle suspension dispersion and vigorous emulsification tasks
• Programmable timer (0–9999 minutes) supporting single-stage or multi-phase protocols (forward/reverse/pause sequences)
• Thermally protected motor housing and overload detection circuitry with audible/visual fault indication
• IP20-rated enclosure compliant with IEC 61010-1 safety requirements for laboratory electrical equipment

Sample Compatibility & Compliance

The DJ-100W accommodates standard glassware including beakers (up to 10 L capacity), Erlenmeyer flasks, and jacketed reactors with compatible stir bar dimensions (typically Ø6–10 mm × 30–60 mm). It supports aqueous, organic, and mildly corrosive media when used with chemically resistant PTFE- or ceramic-coated stir bars. While the unit itself does not incorporate temperature regulation, it is mechanically compatible with external heating mantles or water baths. From a regulatory standpoint, its design adheres to fundamental safety principles outlined in IEC 61010-1 and incorporates functional elements aligned with GLP documentation practices—including non-volatile timer logging and deterministic motor response—enabling traceable protocol execution in regulated environments. It is not certified for use in explosion-hazardous areas (ATEX/IECEx) or sterile processing suites.

Software & Data Management

The DJ-100W operates as a standalone instrument with no embedded firmware-based data export or PC connectivity. All operational parameters (set speed, timer values, phase sequence logic) are retained in volatile memory during power cycling but are not archived or timestamped. For laboratories requiring audit trails, integration with external environmental monitoring systems or programmable logic controllers (PLCs) is possible via optional analog voltage output (0–10 V) representing real-time RPM—a feature available upon request for OEM configurations. The absence of network interfaces ensures electromagnetic compatibility in sensitive instrumentation zones and simplifies validation under FDA 21 CFR Part 11 Annex 11 frameworks where electronic records are not generated.

Applications

• Standardized dissolution testing per USP using calibrated paddle/basket assemblies
• Preparation of calibration standards and reference solutions in analytical chemistry labs
• Homogenization of cell culture media, nutrient broths, or enzyme reaction mixtures prior to spectrophotometric analysis
• Dispersion of nanoparticles in aqueous suspensions for DLS or zeta potential characterization
• Accelerated aging studies involving solvent-based polymer blends under ambient conditions
• Supporting ASTM D2196 (viscosity of paints) and ISO 2557-2 (plasticizer migration) sample conditioning steps

FAQ

Does the DJ-100W support RS-232 or USB communication?
No. It is a self-contained analog-digital hybrid controller without serial or host interface capabilities.
Can the unit operate continuously for 72 hours or longer?
Yes—provided ambient temperature remains below 35°C and duty cycle does not exceed 100% at maximum load (10 L water, 1400 rpm); thermal protection will engage if internal motor temperature exceeds 85°C.
Is the timer resolution adjustable to seconds?
No. Timer increments are displayed and executed in one-minute intervals; sub-minute timing requires external stopwatch synchronization.
What stir bar sizes are recommended for optimal coupling at 1400 rpm?
For stable operation above 1000 rpm, use cylindrical PTFE-coated stir bars with aspect ratios ≤ 6:1 (e.g., 8 mm × 40 mm) and ensure vessel depth exceeds 1.5× bar length to prevent vortex-induced wobble.
Does the manufacturer provide IQ/OQ documentation templates?
CZGY supplies basic factory test reports and mechanical calibration certificates; site-specific IQ/OQ protocols must be developed by end users in accordance with local quality system requirements.