CZGY HH-4 Digital Display Constant Temperature Water Bath (Single-Row)

Overview

The CZGY HH-4 Digital Display Constant Temperature Water Bath (Single-Row) is a precision-engineered laboratory thermal platform designed for stable, uniform temperature maintenance in aqueous or oil-based media. Operating on the principle of resistive heating with feedback-controlled thermal regulation, it delivers consistent thermal environments essential for applications requiring precise thermal input without agitation or circulation. Its architecture follows classical immersion-bath design—featuring a fully welded 304 stainless steel inner tank for corrosion resistance and long-term chemical compatibility, housed within a durable cold-rolled steel outer shell finished with industrial-grade epoxy powder coating. Unlike circulating baths, the HH-4 relies on natural convection and high thermal mass for stability, making it ideal for static incubation, sample equilibration, enzymatic reactions, dissolution testing, and gentle warming of reagents or biological specimens where mechanical disturbance must be avoided.

Key Features

• Four-well single-row configuration (120 mm well diameter, four concentric rings per cover plate) optimized for parallel processing of standard lab vessels including test tubes, flasks, and beakers.
• Digital PID temperature controller with intuitive front-panel interface: SET key for parameter entry, ↑/↓ keys for adjustment, and real-time display of setpoint and actual bath temperature.
• High-reproducibility thermal control across 0–100 °C range with ±0.5 °C accuracy at steady state—validated per ASTM E2207 for laboratory bath performance verification.
• No-circulation design eliminates cross-contamination risk and preserves delicate samples; suitable for GLP-compliant workflows where fluid homogeneity is maintained passively.
• Robust safety architecture: grounded 220 V AC input (IEC 61010-1 compliant), automatic overtemperature cutoff, and mandatory earth-ground connection specified in operating instructions.
• Modular mechanical design enables field serviceability; heating elements are accessible via removable base panel, and stainless steel tank integrity supports repeated autoclave-compatible cleaning protocols.

Sample Compatibility & Compliance

The HH-4 accommodates glass, polypropylene, and borosilicate containers up to 1000 mL volume per well. Its non-circulating operation ensures compatibility with low-viscosity aqueous solutions, buffer preparations, enzyme storage media, and pharmaceutical excipient melts (e.g., PEG 400, glycerol). It meets general requirements for ISO/IEC 17025-accredited laboratories performing temperature-dependent sample conditioning prior to HPLC injection, titration, or spectrophotometric analysis. While not certified to USP or FDA 21 CFR Part 11 out-of-the-box, its digital setpoint logging capability (via optional external data logger integration) supports audit-ready documentation when deployed in regulated QC environments under documented SOPs.

Software & Data Management

The HH-4 operates as a standalone analog-digital hybrid instrument with no embedded firmware update capability or native USB/Ethernet connectivity. Temperature setpoints and real-time readings are displayed locally only. For traceable data capture, users may integrate third-party calibrated thermistors (e.g., PT100 Class A) connected to validated data acquisition systems compliant with 21 CFR Part 11 Annex 11 requirements. The PID controller’s internal parameters—including proportional band (P), integral time (I = 180 s default), derivative time (D = 45 s default), and output cycle time (T = 20–60 s adjustable)—are accessible via extended key press sequences and support fine-tuning for specific thermal load profiles. All configuration changes require manual recording per laboratory documentation standards.

Applications

• Pre-warming of culture media and agarose gels prior to pouring or electrophoresis setup.
• Controlled solubilization of temperature-sensitive compounds (e.g., antibiotics, hormones) in pharmaceutical R&D.
• Standardized conditioning of polymer samples prior to tensile testing per ASTM D638.
• Stabilization of calibration standards for pH meters and conductivity probes.
• Low-shear thermal activation of restriction enzymes and ligases in molecular biology workflows.
• Supporting dissolution apparatus (USP Apparatus I & II) water baths in generic drug bioequivalence studies.

FAQ

What is the maximum recommended liquid fill level?
Do not exceed 80 mm depth above the heating element surface; minimum coverage must fully submerge the heater to prevent dry-firing damage.
Can this unit be used with oil as the heat transfer medium?
Yes—compatible with silicone oils and mineral oils up to 100 °C; ensure oil viscosity remains below 100 cSt at operating temperature to maintain natural convection efficiency.
Is the HH-4 suitable for GMP-regulated environments?
It may be deployed in GMP settings when operated under validated SOPs, with periodic temperature mapping (per ISO 14644-3), and paired with external calibrated loggers for electronic record retention.
How often should the stainless steel tank be passivated?
Passivation is recommended after any exposure to chlorinated buffers or acidic solutions; perform per ASTM A967 using nitric acid solution followed by thorough deionized water rinse and air drying.
Does the unit include a calibration certificate?
No factory-issued NIST-traceable calibration certificate is provided; users must perform initial verification using a Class A thermometer per ISO/IEC 17025 clause 5.10 prior to first use.