CZGY HH-S6H Digital Constant-Temperature Constant-Speed Magnetic Stirring Water Bath with Brushless Motor

Overview

The CZGY HH-S6H is a precision-engineered digital constant-temperature magnetic stirring water bath designed for reproducible thermal and mechanical conditioning of liquid samples in analytical, pharmaceutical, biochemical, and quality control laboratories. It integrates dual independent control systems—PID-regulated resistive heating and digitally synchronized brushless DC motor-driven magnetic stirring—to maintain simultaneous stability in temperature and rotational speed across extended operation cycles. Unlike conventional AC-motor-based units, the HH-S6H employs an 8-channel brushless motor architecture, eliminating carbon brush wear, reducing electromagnetic interference, and enabling high-resolution speed modulation from standstill to 2000 rpm with ±1 rpm repeatability. Its 17.4 L stainless-steel bath chamber supports large-volume reactions, dissolution testing, enzyme kinetics assays, and sample equilibration under strictly defined thermal profiles. The system operates within a calibrated range of ambient +5°C to 100°C, achieving ±0.5°C thermal uniformity across the working zone—validated per ASTM E1112 and ISO/IEC 17025-compliant calibration protocols.

Key Features

• Dual digital display interface: Independent LED readouts for real-time temperature (°C) and stirring speed (rpm), with dedicated parameter keys for rapid setpoint adjustment.
• Brushless motor array: Eight isolated brushless DC motors provide synchronized or individually timed stirring across multiple vessels; eliminates maintenance downtime associated with brushed motor degradation.
• Intelligent dry-run protection: Integrated level sensor triggers automatic heating shutdown when water volume falls below operational threshold—prevents heater coil damage and ensures GLP-compliant safety logging.
• Precise dual-timer architecture: Separate programmable timers for temperature hold duration (0–999 minutes/hours) and stirring activation (0–999 minutes per channel, up to eight concurrent programs).
• Rugged construction: 304 stainless-steel bath tank, reinforced aluminum alloy housing, and IP22-rated electrical enclosure suitable for standard laboratory environments.
• Low thermal inertia design: Optimized heater geometry and forced-convection bath circulation minimize overshoot and stabilize setpoints within ≤3 minutes after load introduction.

Sample Compatibility & Compliance

The HH-S6H accommodates standard laboratory glassware including beakers (up to 2 L), Erlenmeyer flasks, volumetric cylinders, and custom reaction vessels with magnetic stir bars (diameters 8–15 mm). Its uniform temperature distribution meets requirements for USP dissolution apparatus calibration and ASTM D2515 viscosity sample conditioning. The unit complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and supports audit-ready documentation through optional RS232/USB data export (firmware v2.3+). All thermal and speed calibrations are traceable to NIM (National Institute of Metrology, China) standards, with optional UKAS-accredited calibration certificates available upon request.

Software & Data Management

While the HH-S6H operates as a standalone instrument, its firmware supports bidirectional serial communication via RS232 or USB-to-serial adapter (optional). Third-party lab information management systems (LIMS) and electronic lab notebooks (ELN) can log timestamped temperature and speed values at user-defined intervals (1–60 s resolution). Firmware v2.3 introduces non-volatile memory for storing up to 16 user-defined protocols—including ramp-hold profiles and multi-stage stirring sequences—with password-protected access control. Audit trail functionality records all parameter changes, timer activations, and safety events in chronological order, satisfying FDA 21 CFR Part 11 requirements when paired with validated software clients.

Applications

• Dissolution testing of solid oral dosage forms under USP Apparatus I/II conditions.
• Enzyme activity assays requiring precise thermal incubation and homogeneous mixing (e.g., kinase kinetics, PCR master mix preparation).
• Standardization of viscosity reference fluids prior to rheometer calibration.
• Accelerated stability studies per ICH Q1A(R2), including temperature-cycled protocols with synchronized agitation.
• Preparation of homogeneous colloidal suspensions, nanoparticle dispersions, and polymer solutions.
• Cell culture media pre-warming and reagent equilibration in molecular biology workflows.

FAQ

Does the HH-S6H support external temperature probe input for vessel-specific monitoring?
No—the unit relies on built-in PT100 sensor immersion in the bath medium; external probe integration is not supported in current hardware revision.
Can the eight stirring channels operate at different speeds simultaneously?
Yes—each channel is independently controllable via front-panel navigation or serial command set; speed resolution remains ±1 rpm across all channels.
Is the bath tank removable for cleaning or replacement?
The 304 stainless-steel tank is permanently welded into the chassis; cleaning is performed in situ using mild detergent and deionized water.
What is the maximum allowable load weight on the bath platform?
The platform supports up to 8 kg distributed load; exceeding this may compromise thermal uniformity and stir bar coupling efficiency.
Does the device include factory calibration documentation?
Yes—a certificate of conformance with initial temperature and speed verification data is supplied with each unit; NIST-traceable calibration reports are available as add-on service.