CZGY HH-Series Digital Display Constant Temperature Water Bath

Overview

The CZGY HH-Series Digital Display Constant Temperature Water Bath is an entry-level, benchtop thermal stabilization device engineered for precise and stable temperature control in routine laboratory applications. It operates on the principle of resistive heating combined with digital PID temperature regulation—where a stainless steel immersion heater transfers thermal energy uniformly into the water medium, and a platinum resistance thermometer (PT100) provides real-time feedback to the microprocessor-based controller. Designed for static (non-circulating) bath operation, it delivers consistent thermal environments ideal for applications requiring gentle, uniform heat without convective mixing—such as enzyme incubation, sample equilibration prior to analysis, reagent warming, or solvent preheating in preparative chemistry. Its architecture prioritizes mechanical robustness, electrical safety, and operational simplicity—meeting foundational requirements for ISO/IEC 17025-compliant laboratories where traceable temperature stability and repeatable experimental conditions are essential.

Key Features

• Digital LED display with intuitive push-button interface (SET, ↑, ↓) for direct temperature setpoint adjustment and real-time monitoring
• PID-controlled heating system with adjustable proportional band (P), cycle time (T), and anti-overshoot parameter (E) to optimize thermal response and minimize relay cycling
• Corrosion-resistant 304 stainless steel inner tank—welded construction ensures long-term integrity against aqueous and mildly corrosive media
• Powder-coated cold-rolled steel outer housing enhances durability and chemical resistance in shared lab environments
• Fixed-hole configuration options (1–8 wells), with standardized well diameter of 120 mm and depth of 120 mm; single- and double-row layouts accommodate diverse vessel sizes (test tubes, beakers, flasks)
• Integrated grounding terminal and three-pin power cord compliant with IEC 61000-6-3 EMC standards and basic electrical safety requirements per IEC 61010-1

Sample Compatibility & Compliance

The HH-Series supports standard glassware including 10–50 mL test tubes, 100–500 mL beakers, and low-form flasks up to 150 mm in height. It is not designed for sealed or pressurized vessels. While the unit itself does not carry CE, UL, or UKCA certification, its design adheres to fundamental safety principles referenced in EN 61010-1:2010 for laboratory electrical equipment. For GLP/GMP-regulated workflows, users must implement external calibration procedures traceable to NIST or national metrology institutes—at minimum annually or per internal SOP. The absence of circulation means temperature homogeneity relies on natural convection; therefore, ISO 17025-accredited labs should validate spatial uniformity (e.g., using calibrated PT100 probes at multiple depths and positions) before use in validated methods.

Software & Data Management

This analog-digital hybrid instrument features no embedded software, network connectivity, or data logging capability. Temperature setpoints and controller parameters (P, T, E) are configured manually via front-panel buttons. All operational states—including setpoint, measured temperature, and relay status—are visible on the dual-digit LED display. For auditability in regulated environments, users must maintain manual logbooks or integrate external digital thermometers with timestamped recording (e.g., Fluke 1524 or Omega HH309A) to satisfy FDA 21 CFR Part 11 requirements for electronic records. Firmware updates are not applicable; hardware revisions follow manufacturer’s engineering change notices (ECNs) issued upon design modification.

Applications

• Pre-warming of culture media, buffers, and enzymatic reagents prior to cell lysis or PCR setup
• Controlled dissolution testing of pharmaceutical excipients under USP <724> guidelines (when used as auxiliary thermal stage)
• Constant-temperature conditioning of polymer samples prior to tensile or rheological characterization
• Accelerated aging studies of packaging materials per ASTM D3045
• Extraction protocols involving aqueous phase separation (e.g., phenol-chloroform DNA isolation)
• Calibration verification of liquid-in-glass thermometers and digital probe sensors

FAQ

What is the maximum operating temperature and accuracy specification?
The HH-Series achieves a maximum setpoint of 100 °C with a stated control accuracy of ±0.5 °C under steady-state conditions, verified at mid-bath depth with a calibrated reference thermometer.
Can this unit be used with oil instead of water?
Yes—it is rated for both water and silicone or mineral oil baths; however, maximum safe oil temperature depends on flash point and viscosity; do not exceed 80 °C with common silicone oils to prevent thermal degradation.
Is external calibration required for compliance?
Yes. As a Class II laboratory thermal device, periodic calibration against a certified reference standard is mandatory for ISO/IEC 17025 or GxP compliance; CZGY provides no built-in calibration certificate.
Does the unit include over-temperature protection?
No independent high-limit cut-off is integrated; users must rely on proper procedural controls and never leave the bath unattended during operation.
How should the bath be maintained to ensure longevity?
Drain and dry thoroughly after each use; avoid prolonged exposure to chlorinated tap water; clean interior with mild detergent and rinse with deionized water to prevent scale buildup on the heating element.