CZGY JJ-4D Four-Station Independent Temperature-Controlled Water Bath Magnetic Stirrer

Overview

The CZGY JJ-4D is a four-station benchtop electric stirrer integrated with independent water bath temperature control systems. Engineered for precision and reproducibility in routine and method-driven laboratory workflows, it employs direct-drive DC motor technology with permanent magnet excitation to deliver stable rotational torque across the full speed range (200–3000 rpm). Each station operates autonomously—mechanically isolated and thermally decoupled—enabling simultaneous but distinct experimental conditions across four samples. The system utilizes resistive immersion heating elements within stainless steel water baths, coupled with PID-based digital temperature regulation and real-time LED display per channel. Its design conforms to standard laboratory safety and operational expectations for Class I electrical equipment under IEC 61010-1, supporting applications requiring controlled thermal input during mechanical agitation—particularly where viscosity, dissolution kinetics, or reaction homogeneity must be maintained under defined thermal profiles.

Key Features

• Four fully independent stirring stations—each with dedicated motor, speed controller, timer, and temperature regulator
• High-stability DC motors (60 W per station) with electronic speed feedback and analog tachometer output; no gear reduction, minimizing mechanical drift
• Non-contact speed sensing with ±1 rpm accuracy and continuous digital RPM readout on individual LED displays
• Independent mechanical timers (0–9990 minutes per station), programmable separately without cross-channel interference
• Stainless steel water bath chambers (150 × 150 × 120 mm each) with corrosion-resistant finish and uniform heat distribution via bottom-mounted heating elements
• Digital temperature control with 0.1 °C resolution and ±0.5 °C accuracy across ambient +5 °C to 99.9 °C; auto-tuning PID algorithm per channel
• Front-panel LED indicators for power status, heating active, motor running, and timer countdown per station
• Robust aluminum alloy chassis with reinforced base plate for vibration damping and long-term operational stability

Sample Compatibility & Compliance

The JJ-4D accommodates standard laboratory glassware up to 1 L per station—including beakers, Erlenmeyer flasks, and digestion vessels—when used with compatible magnetic stir bars (not included). It supports aqueous, low-viscosity organic, and buffered saline solutions typical in environmental testing, pharmaceutical QC, and wastewater analysis protocols. The unit complies with general-purpose laboratory equipment requirements under ISO/IEC 17025:2017 for equipment qualification, and its electrical architecture meets CE marking criteria per Directive 2014/30/EU (EMC) and 2014/35/EU (LVD). While not intrinsically rated for hazardous area use, it is suitable for standard analytical laboratories operating under GLP-compliant environments when deployed with documented calibration and maintenance records.

Software & Data Management

The JJ-4D operates as a standalone instrument without embedded software or connectivity interfaces. All operational parameters—speed, temperature, and timer—are set and monitored locally via front-panel controls and LED displays. For laboratories requiring traceable parameter logging, integration with external data acquisition systems is possible using optional analog voltage outputs (0–10 V) for speed and temperature signals (available upon request with OEM configuration). When used in regulated environments (e.g., USP , ASTM D2765), users are advised to implement periodic verification per internal SOPs, including speed calibration with certified tachometers and temperature validation using NIST-traceable PT100 probes at multiple setpoints.

Applications

• Standardized dissolution testing of solid dosage forms under USP Apparatus 2 (paddle) conditions
• Simultaneous BOD/COD sample preparation in municipal and industrial wastewater laboratories
• Controlled heating and mixing during buffer preparation, reagent synthesis, and extraction protocols
• Thermal stability studies of colloidal suspensions, polymer solutions, and enzyme formulations
• Method development for EPA Method 1681 (wastewater disinfection byproduct formation)
• QC batch testing in chemical manufacturing where multi-sample thermal-mechanical consistency is required

FAQ

Does the JJ-4D support RS-232 or USB communication for remote control?
No—the unit is designed as a manually operated, stand-alone instrument without digital communication ports.
Can the water bath tanks be replaced with oil baths for higher temperature operation?
No—the system is engineered exclusively for aqueous media; substitution with oil may compromise seal integrity, thermal sensor accuracy, and safety compliance.
Is calibration documentation provided with the instrument?
Factory calibration certificates are available upon request at time of order; however, formal metrological calibration must be performed post-installation by an accredited third-party lab.
What is the recommended maintenance interval for motor brushes and thermal sensors?
Brushless DC motor design eliminates brush wear; thermal sensors require annual verification against reference standards as part of preventive maintenance.
Are replacement stir bars and bath covers available as accessories?
Yes—CZGY offers PTFE-coated magnetic stir bars (various sizes) and custom-fitted silicone bath covers (sold separately) to minimize evaporation during extended runs.