CZGY HH-1 Digital Display Constant Temperature Water Bath
| Brand | CZGY |
|---|---|
| Model | HH-1 |
| Type | Water Bath |
| Heating Power | 300 W |
| Tank Dimensions (L×W×H) | 160×160×120 mm |
| Temperature Range | Ambient to 100 °C |
| Temperature Stability | ±0.5 °C |
| Control Method | Digital PID |
| Construction | Stainless Steel Inner Chamber, Cold-Rolled Steel Exterior with Powder Coating |
| Power Supply | 220 V AC, 50 Hz |
| Compliance | Designed for GLP-compliant laboratory environments |
Overview
The CZGY HH-1 Digital Display Constant Temperature Water Bath is an entry-level, precision-engineered thermal platform designed for routine laboratory applications requiring stable and repeatable temperature control in aqueous media. Operating on the principle of resistive heating with direct immersion of sample containers into a thermally uniform water bath, the HH-1 delivers consistent thermal energy transfer without forced circulation—making it ideal for static incubation, gentle sample warming, enzymatic reactions, dissolution testing, and pre-heating prior to analytical procedures. Its stainless steel inner tank ensures chemical resistance and long-term durability under repeated exposure to water, buffers, and mild reagents, while the powder-coated cold-rolled steel housing provides mechanical robustness and corrosion resistance in standard laboratory environments. Engineered for reliability rather than high-throughput automation, the HH-1 serves as a foundational thermal tool in teaching labs, QC/QA units, and R&D support settings where cost-efficiency, operational simplicity, and regulatory traceability are prioritized.
Key Features
- Digital PID temperature controller with intuitive push-button interface (SET, ↑, ↓) for precise setpoint adjustment and real-time display
- Temperature stability of ±0.5 °C across the full operating range (ambient to 100 °C), verified per ISO/IEC 17025 calibration practices
- Single-hole configuration (160 × 160 × 120 mm tank volume) optimized for space-constrained benchtop use
- 300 W heating element with thermal cut-off protection and grounded chassis design compliant with IEC 61010-1 safety standards
- No-circulation architecture minimizes mechanical complexity and eliminates risk of cross-contamination between samples
- Front-panel digital LED display enables immediate visual verification of current and set temperatures—critical for audit-ready documentation
Sample Compatibility & Compliance
The HH-1 accommodates standard laboratory glassware including test tubes (up to Ø25 mm), beakers, flasks, and sample vials placed directly into the water medium. It is compatible with aqueous solutions, saline buffers, and low-viscosity biological media; however, it is not rated for oil-based thermal transfer fluids or aggressive solvents. The unit conforms to general-purpose laboratory equipment requirements under ISO 15190:2020 (laboratory safety) and supports adherence to Good Laboratory Practice (GLP) through its stable thermal performance and manual parameter logging capability. While not equipped with electronic audit trails or 21 CFR Part 11–compliant software, its analog-digital hybrid control system allows full manual recording of setpoints, duration, and observed deviations—sufficient for non-GMP educational and preliminary research workflows.
Software & Data Management
The HH-1 operates as a standalone instrument with no embedded firmware connectivity (no USB, RS-232, or Ethernet ports). All temperature parameters—including setpoint, actual reading, and PID tuning values (P, T, E)—are configured and monitored locally via the front-panel keypad and LED display. Users may manually document operational logs in laboratory notebooks or LIMS-compatible spreadsheets. For laboratories requiring digital data capture, external temperature dataloggers (e.g., calibrated Pt100 probes interfaced with USB-enabled recorders) can be deployed alongside the unit to generate time-stamped thermal profiles—ensuring compliance with internal SOPs and external accreditation audits such as ISO/IEC 17025 Clause 7.7 (result reporting).
Applications
- Pre-warming reagents and culture media prior to cell-based assays or microbiological inoculation
- Controlled hydration and swelling of hydrogels and polymer films
- Standardized dissolution testing of pharmaceutical dosage forms per USP
- Enzyme kinetics studies requiring stable sub-boiling thermal conditions (e.g., alkaline phosphatase, β-galactosidase)
- Calibration verification of liquid-in-glass thermometers and digital probe sensors
- Supporting ASTM D1250 (Petroleum Measurement Tables) and ISO 3104 (kinematic viscosity of transparent and opaque liquids) when used as a thermal conditioning stage
FAQ
What is the maximum recommended fill level for the water bath?
The water level must fully submerge the heating element but remain at least 20 mm below the top rim to prevent overflow during boiling. Overfilling risks electrical hazard and thermal instability.
Can this unit be used with oil or organic solvents?
No. The HH-1 is rated exclusively for water-based operation. Oil or solvent use may compromise gasket integrity, accelerate corrosion, and invalidate safety certifications.
Is the temperature controller programmable for ramp-hold cycles?
No. The HH-1 supports only fixed-point temperature control. Multi-step thermal protocols require external programmable controllers or manual intervention.
Does the unit include a calibration certificate?
Factory calibration is performed at 37 °C and 100 °C using NIST-traceable reference thermometers. A calibration report is available upon request at time of order—required for ISO/IEC 17025–accredited labs.
How often should maintenance be performed?
Biannual inspection of heater terminals, grounding continuity, and tank integrity is recommended. Deionized water usage and periodic descaling (with 5% acetic acid solution) extend service life beyond 5 years under typical lab usage.
