Hanuo 76-1B Stirred Glass Water Bath Circulator

Overview

The Hanuo 76-1B Stirred Glass Water Bath Circulator is a precision-engineered benchtop thermal platform designed for consistent, uniform temperature control in laboratory applications requiring gentle yet reliable heating and mechanical homogenization. Unlike passive water baths, the 76-1B integrates a built-in electric stirrer and internal recirculation system to eliminate thermal stratification—ensuring rapid equilibration and high spatial temperature uniformity across the entire 18 L working volume. Its transparent borosilicate glass bath vessel enables real-time visual monitoring of samples, reaction progress, and fluid dynamics without compromising thermal integrity. The device operates exclusively in heating mode (no refrigeration), making it suitable for applications where stable, sub-boiling thermal environments are required—such as enzymatic assays, solvent evaporation, sample pre-warming, controlled hydrolysis, and temperature-dependent solubility studies. Engineered for daily use in regulated environments, the unit complies with general electrical safety standards (IEC 61010-1) and supports GLP-aligned documentation through traceable digital temperature readout and manual operational logging.

Key Features

• Borosilicate glass bath chamber (Ø300 × 300 mm) for optical clarity, chemical resistance, and thermal shock tolerance
• Integrated continuously variable-speed stirring motor (30 W, typical range: 0–600 rpm) ensuring homogeneous heat distribution and minimizing localized hot spots
• Digital LED temperature display with ±0.5 °C stability at setpoint across the full ambient-to-100 °C operating range
• 900 W high-efficiency heating element with PID-based temperature regulation for fast ramp-up and minimal overshoot
• Stainless steel structural base and insulated enclosure for mechanical robustness and energy conservation
• Internal recirculation loop (no external pump or tubing) simplifying setup, reducing maintenance, and eliminating cross-contamination risks

Sample Compatibility & Compliance

The 76-1B accommodates standard laboratory glassware—including Erlenmeyer flasks (up to 2 L), beakers, test tubes, and immersion-cooled reactors—within its open-top bath geometry. Its non-metallic wetted path (glass + silicone gaskets) ensures compatibility with mildly acidic, basic, and organic solvent systems commonly used in pharmaceutical stability testing (per ICH Q1A–Q1E), biochemical extraction, and QC dissolution pre-conditioning. While not certified for FDA 21 CFR Part 11 compliance out-of-the-box, the unit’s analog/digital hybrid interface allows integration into validated workflows when paired with external data loggers meeting ALCOA+ principles. It meets CE marking requirements for low-voltage equipment and conforms to ISO/IEC 17025-relevant environmental conditioning criteria for calibration laboratories performing temperature uniformity mapping per ASTM E2207.

Software & Data Management

The Hanuo 76-1B operates via a dedicated front-panel controller with no embedded software or network connectivity. Temperature setpoint and stirring speed are adjusted manually using calibrated rotary dials; real-time values are displayed on a dual-digit LED screen. For audit-ready operation in GxP environments, users may connect third-party USB or RS-232 data loggers (e.g., Omega OM-DAQPRO-5300 or Testo 176 T4) to record time-stamped temperature and stir speed profiles. All logged data can be exported in CSV format for inclusion in electronic lab notebooks (ELN) or LIMS systems. No firmware updates, cloud services, or proprietary drivers are required—ensuring long-term operational continuity and IT security compliance.

Applications

• Pre-heating reagents and buffers prior to HPLC injection or PCR setup
• Controlled evaporation of organic solvents under reduced pressure (rotary evaporation support)
• Temperature-dependent viscosity measurements of polymer solutions using capillary viscometers
• Incubation of cell culture media or antibody diluents at physiological or elevated temperatures
• Calibration of liquid-in-glass thermometers and RTDs against NIST-traceable references
• Soil and sediment leaching studies requiring sustained 40–80 °C thermal exposure per EPA Method 1311

FAQ

Is the bath vessel removable for cleaning or replacement?
Yes—the borosilicate glass tank is mechanically secured but fully detachable without tools, enabling thorough decontamination or replacement if chipped or etched.
Can this unit maintain temperature under load with multiple large vessels?
With proper loading (≤75% bath volume occupied by immersed glassware), the 76-1B achieves ±0.5 °C stability even during continuous 8-hour operation at 95 °C, provided ambient room temperature remains ≤25 °C and airflow around the unit is unobstructed.
Does it support external temperature probe input for chamber feedback control?
No—the unit relies solely on its integrated PT100 sensor located near the heater base; external probe inputs are not supported.
What is the expected service life of the stirring motor under continuous duty?
Rated for >10,000 hours of intermittent operation; continuous 24/7 use is not recommended—maximum recommended duty cycle is 8 hours per day with 30-minute cooldown intervals.
Is there over-temperature protection?
Yes—a redundant mechanical cut-off switch (110 °C nominal trip point) disables heating independently of the main controller, providing fail-safe thermal protection.