ZiQi HH-Series Digital Constant-Temperature Water Bath with Dry-Run Protection

Overview

The ZiQi HH-Series Digital Constant-Temperature Water Bath is an engineered solution for precise, stable, and safe thermal incubation of samples in research laboratories, quality control environments, and educational institutions. Designed around the fundamental principle of convective heat transfer via water as a uniform thermal medium, this series delivers consistent temperature distribution across the bath chamber—critical for applications requiring reproducible thermal conditioning over extended durations. Unlike traditional welded-tank water baths prone to seam corrosion and leakage, the HH-Series features a seamless, deep-drawn 304 stainless steel inner tank, eliminating structural weak points and ensuring long-term integrity under repeated thermal cycling and chemical exposure. All P-model variants integrate intelligent dry-run protection—a hardware-monitored safety circuit that automatically de-energizes the heating element when water level falls below the minimum operational threshold, preventing heater damage and mitigating fire risk. The unit operates within a validated temperature range of ambient +5°C to 100°C, with microprocessor-based PID control enabling high repeatability and minimal overshoot.

Key Features

• Seamless 304 stainless steel inner tank formed via single-stage deep drawing—resists pitting, crevice corrosion, and leakage; eliminates weld seams and associated maintenance vulnerabilities.
• Microprocessor-controlled PID temperature regulation with digital LED display, delivering ±0.5°C accuracy across the full operating range.
• Dry-run protection circuit (exclusive to P-series models) continuously monitors water level and cuts power to the heating element upon detection of insufficient fluid volume.
• Optimized thermal geometry: rounded internal corners and arc-shaped base minimize thermal stratification and stagnant zones, enhancing temperature uniformity (±0.8°C typical across chamber volume).
• Robust cold-rolled steel outer housing with electrostatic powder coating; external radius edges improve impact resistance during handling and transport while facilitating wipe-down cleaning.
• Modular configuration: five standardized models (HH-S11P to HH-S28P) accommodate 1–8 sample vessels, with scalable heating power (300 W to 1800 W) matched to chamber volume and thermal load requirements.

Sample Compatibility & Compliance

The HH-Series supports standard laboratory glassware including test tubes (10–25 mm OD), culture flasks, beakers, and enzymatic reaction vials. Its open-bath design permits direct immersion of containers without lid interference, while the uniform temperature field ensures reliable thermal equilibration for kinetic assays, enzyme denaturation studies, and solubility testing. The device complies with IEC 61010-1:2010 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use) and meets electromagnetic compatibility standards per EN 61326-1:2013. While not certified for GLP/GMP production environments, its traceable temperature control, stable setpoint retention (>72 h at 37°C), and dry-run safeguard support documentation-ready workflows aligned with ISO/IEC 17025 clause 5.4.2 (Equipment Calibration and Verification). All units undergo factory verification against NIST-traceable reference thermometers prior to shipment.

Software & Data Management

The HH-Series operates as a standalone analog-digital hybrid instrument with no embedded data logging or remote interface. Temperature setpoint and real-time chamber reading are displayed on a high-contrast 4-digit LED screen. For laboratories requiring audit trails or electronic records, optional third-party USB temperature loggers (e.g., Omega OM-DAQPRO-5300) may be immersed alongside samples to capture time-stamped thermal profiles compliant with FDA 21 CFR Part 11 when paired with validated acquisition software. No firmware updates or cloud connectivity are provided; control logic resides entirely in hardened ASIC-based circuitry to ensure operational continuity and immunity to cyber disruption.

Applications

• Enzyme activity assays and protein stability studies requiring precise 37°C or 60°C incubation.
• Cell culture media pre-warming and reagent equilibration prior to sterile processing.
• Chemical hydrolysis kinetics, dissolution testing (USP ), and viscosity standardization baths.
• Calibration of liquid-in-glass thermometers and RTD probes using fixed-point water baths.
• Educational demonstrations of thermal conduction, phase-change behavior, and Arrhenius kinetics.
• Preparatory steps in HPLC mobile phase degassing and GC sample derivatization protocols.

FAQ

Does the HH-Series meet international electrical safety standards?
Yes—each unit is certified to IEC 61010-1:2010 and carries CE marking for EMC compliance per EN 61326-1:2013.
Is calibration documentation included with shipment?
A factory calibration report—referencing NIST-traceable standards and listing measured deviation at 25°C, 37°C, and 60°C—is supplied with every unit.
Can the water bath be used with organic solvents?
No. The system is designed exclusively for aqueous media; use of flammable or corrosive liquids voids warranty and compromises safety circuit integrity.
What is the expected service life under continuous operation?
With routine descaling and distilled water usage, the heating element and control board typically exceed 10,000 hours of cumulative runtime.
Are replacement tanks available for field service?
Yes—original-specification 304 stainless steel inner tanks are stocked and shipped with mounting gaskets and thermal sensor assemblies for straightforward replacement.