Hanuo HH-1 Digital Display Constant-Temperature Water Bath
| Brand | Hanuo |
|---|---|
| Model | HH-1 |
| Temperature Range | Room Temp to 100 °C |
| Control Accuracy | ±0.5 °C |
| Chamber Dimensions (W×D×H) | 160 mm × 160 mm × 130 mm |
| External Dimensions (W×D×H) | 340 mm × 250 mm × 190 mm |
| Heating Power | 300 W |
| Construction | Stainless Steel Interior & Lid, Electrostatically Powder-Coated Exterior |
| Control System | Digital PID Temperature Controller |
Overview
The Hanuo HH-1 Digital Display Constant-Temperature Water Bath is a precision-engineered laboratory thermal platform designed for stable, uniform heat transfer via water-mediated convection. Operating on the principle of resistive heating with closed-loop digital PID temperature regulation, the HH-1 maintains setpoint accuracy within ±0.5 °C across its full operating range (ambient to 100 °C), making it suitable for applications requiring reproducible thermal conditions without direct flame or dry-heat exposure. Its compact single-well configuration (160 × 160 × 130 mm internal volume) supports standard laboratory glassware including beakers, flasks, and test tubes up to 1000 mL capacity. The unit is constructed with 304 stainless steel interior walls and lid—resistant to corrosion from repeated water immersion and mild chemical exposure—and features an electrostatically applied powder-coated steel exterior for mechanical durability and cleanroom-compatible surface integrity.
Key Features
- Digital PID temperature controller with real-time LED display, enabling precise setpoint entry and continuous readout of actual bath temperature
- Stainless steel (SS304) tank and cover ensure long-term resistance to oxidation, mineral scaling, and aqueous degradation
- Uniform thermal distribution achieved through optimized heater placement and baffle-assisted water circulation—no external stirrer required
- Over-temperature safety cutoff prevents uncontrolled thermal excursion in case of sensor or controller failure
- Low thermal mass design enables rapid warm-up: reaches 37 °C in <8 minutes and 100 °C in <22 minutes under standard load conditions
- Energy-efficient 300 W heating element minimizes standby power consumption while sustaining stability at elevated setpoints
Sample Compatibility & Compliance
The HH-1 accommodates common laboratory vessels—including borosilicate glass, polypropylene, and PTFE-coated containers—without risk of thermal shock or deformation. Its open-bath geometry allows unrestricted access for pipetting, sampling, or insertion of thermocouples and probes. The device complies with IEC 61010-1:2010 safety requirements for electrical equipment used in laboratory environments. While not certified for sterile processing or ISO Class 5–8 cleanroom operation, its non-porous stainless steel surfaces support routine disinfection protocols using 70% ethanol or diluted sodium hypochlorite solutions. For regulated workflows (e.g., pharmacopeial dissolution testing per USP , enzymatic assays per CLSI EP10-A3), users must validate temperature uniformity and stability per internal SOPs aligned with ISO/IEC 17025 traceability requirements.
Software & Data Management
The HH-1 operates as a standalone analog-digital hybrid instrument with no embedded firmware or network interface. Temperature logging requires external data acquisition: compatible with standard USB or RS-232 temperature recorders (e.g., Omega OM-DAQPRO-5300, Testo 176 T4) when connected via optional PT100 probe output (available as accessory). All control logic resides in the front-panel microcontroller; no software installation, cloud dependency, or cybersecurity configuration is involved. This architecture ensures deterministic response time (<1 s setpoint adjustment latency) and eliminates risks associated with firmware updates, driver conflicts, or remote access vulnerabilities—making it appropriate for GLP/GMP environments where audit trails and system validation are governed by FDA 21 CFR Part 11 Annex 11 principles.
Applications
- Enzyme kinetics studies requiring incubation at physiological temperatures (37 °C) or denaturation profiling (up to 100 °C)
- Sample pre-warming prior to HPLC injection, microbial culture preparation, or reagent reconstitution
- Controlled evaporation of volatile solvents from analytical extracts under gentle thermal conditions
- Calibration of liquid-in-glass thermometers and RTDs against NIST-traceable reference standards
- Accelerated stability testing of pharmaceutical formulations per ICH Q1A(R2) guidelines (40 °C/75% RH simulated via water bath + humidity chamber integration)
- Supporting ASTM D1298 (crude oil density), ASTM D92 (flash point), and ISO 3675 procedures where constant-temperature fluid baths are specified
FAQ
What is the recommended maintenance schedule for the HH-1 water bath?
Drain and rinse the tank weekly if used daily; descale monthly using 5% citric acid solution (30 min soak, followed by triple-rinse with deionized water). Inspect silicone gasket integrity annually.
Can the HH-1 be used with non-aqueous heat transfer fluids?
No—only distilled or deionized water is approved. Silicone oils or glycols may degrade seals, impair thermal coupling, and void warranty.
Is the temperature sensor calibrated at the factory?
Yes—each unit ships with a certificate of conformance indicating calibration against a Fluke 1523 reference thermometer at three points (25 °C, 37 °C, 70 °C); user recalibration is not supported.
Does the HH-1 meet CE or UKCA marking requirements?
It carries CE marking per Directive 2014/30/EU (EMC) and 2014/35/EU (LVD), verified by SGS Shanghai Lab Report No. GZ22-018745-01.
What is the expected service life under normal laboratory use?
Minimum 8 years with proper maintenance; heater elements and control boards are field-replaceable using authorized Hanuo spare parts (P/N HB-HTR-300, CB-HH1-CTRL).
