CZGY HH-S12 Dual-Row 12-Well Digital Constant-Temperature Water Bath

Overview

The CZGY HH-S12 Dual-Row 12-Well Digital Constant-Temperature Water Bath is an engineered solution for precise, uniform, and reproducible thermal conditioning of samples in routine laboratory workflows. Operating on the principle of convective heat transfer via water as a stable, high-heat-capacity medium, the HH-S12 maintains consistent thermal environments across all 12 wells—critical for applications requiring parallel sample processing under identical thermal conditions. Designed for durability and operational transparency, its AISI 304–grade stainless steel inner tank resists corrosion from aqueous reagents, buffers, and mild solvents, while the powder-coated cold-rolled steel chassis ensures mechanical robustness and long-term structural integrity in shared lab environments. Unlike analog thermostats, the HH-S12 employs a microprocessor-controlled digital PID algorithm, enabling fine-tuned thermal regulation between ambient temperature and 100 °C with visual feedback via high-contrast LED display. Its dual-row layout optimizes benchtop footprint without compromising accessibility—each well accommodates standard glassware up to Ø120 mm, with dedicated four-ring covers facilitating vapor retention during prolonged heating or gentle reflux.

Key Features

• Dual-row 12-well configuration (6 wells per row) supports high-throughput sample incubation, enzymatic reactions, dissolution testing, and solvent evaporation protocols.
• Stainless steel inner tank (900 × 310 × 115 mm) fabricated by full seam welding—eliminates crevices where microbial growth or residue accumulation may occur, supporting GLP-aligned cleaning validation.
• 2500 W high-efficiency heating element enables rapid thermal recovery after sample loading; thermal uniformity across wells is maintained within ±0.5 °C at setpoints between 37 °C and 85 °C under standard load conditions.
• Adjustable PID control parameters (P, T, E) allow users to optimize response dynamics: P-band tuning minimizes overshoot during ramp-up; T-cycle (20–60 s default) balances relay longevity against control fidelity; E-hysteresis prevents rapid cycling near setpoint.
• Digital interface with tactile push-button navigation (SET, ↑, ↓) simplifies calibration-free operation—no firmware updates or PC dependency required for daily use.
• Integrated safety architecture includes mandatory grounding (IEC 61010-1 compliant terminal), dry-run protection, and physical barrier design preventing water ingress into electronics.

Sample Compatibility & Compliance

The HH-S12 accommodates a broad range of sample containers—including borosilicate glass test tubes (10–50 mL), beakers (up to 500 mL), flasks, and enzymatic assay plates—provided external dimensions remain within Ø120 mm and height does not impede lid closure. It is routinely deployed in compliance-critical workflows aligned with ASTM D1217 (density determination), USP environmental conditioning support, and ISO 8573-1 compressed air moisture testing pre-conditioning stages. While the instrument itself carries no CE or UL certification mark, its electrical design adheres to IEC 61010-1 Edition 3 safety requirements for laboratory equipment. For GMP/GLP environments, users are advised to perform periodic verification using NIST-traceable PT100 probes and document thermal uniformity per SOPs referencing ISO/IEC 17025 clause 5.10.

Software & Data Management

The HH-S12 operates as a standalone hardware platform with no embedded data logging, USB connectivity, or software interface. All operational parameters—including setpoint, real-time bath temperature, and relay status—are displayed locally via LED digits. This architecture eliminates cybersecurity exposure, reduces validation burden, and ensures uninterrupted functionality in regulated settings where electronic records are not mandated. For laboratories requiring audit trails, external temperature dataloggers (e.g., Omega OM-DAQPRO-5300 series) may be integrated via probe ports compatible with standard 1/4″ NPT thermowells (adapter sold separately). No FDA 21 CFR Part 11 compliance is claimed, as the device lacks user authentication, electronic signature, or change-control mechanisms.

Applications

• Biological sample thawing and enzyme reactivation at controlled rates (e.g., cryopreserved cell suspensions, restriction enzyme buffers).
• Pharmaceutical dissolution testing per USP Apparatus I/II water bath auxiliary systems.
• Chemical synthesis pre-heating of reagents and solvents prior to addition to reaction vessels.
• Microbiological media preparation, agar liquefaction, and sterility maintenance during pour-plating procedures.
• Environmental testing sample equilibration (e.g., BOD incubation support, wastewater parameter stabilization).
• Educational laboratory instruction in thermodynamics, kinetics, and analytical method development where multi-sample comparability is essential.

FAQ

What is the maximum recommended water level for safe operation?
Fill the bath so the water surface remains at least 20 mm above the top of the heating element—never allow the element to operate exposed. Overfilling beyond the overflow notch risks spillage during boiling; minimum fill volume is ~18 L.
Can the HH-S12 be used with non-aqueous liquids such as oil or glycerol?
No. The unit is validated exclusively for deionized or distilled water. Using oils or viscous fluids invalidates thermal calibration, accelerates heater degradation, and voids warranty due to uncontrolled thermal expansion and oxidation risks.
Is the temperature sensor calibrated at the factory, and can it be recalibrated onsite?
The built-in NTC thermistor is factory-set and not user-adjustable. For metrological traceability, external calibration using a certified reference thermometer (e.g., Fluke 1523 with 0.02 °C uncertainty) is recommended annually or after physical impact.
Does the HH-S12 meet RoHS or REACH material compliance standards?
Yes—housing coatings, wiring insulation, and stainless steel components conform to EU Directive 2011/65/EU (RoHS2) and Regulation (EC) No 1907/2006 (REACH) SVHC thresholds, with full material declarations available upon request.
How often should the stainless steel tank be passivated to maintain corrosion resistance?
Passivation is recommended every 12 months using nitric acid-based formulations (ASTM A967 Method A) following thorough descaling with 5% citric acid solution—particularly after repeated use with saline or phosphate-buffered solutions.