Yiheng DKZ Series Constant-Temperature Shaking Water Bath

Overview

The Yiheng DKZ Series Constant-Temperature Shaking Water Bath is an integrated laboratory platform engineered for precise thermal regulation and controlled orbital or linear agitation of aqueous samples. Designed around a dual-function thermoelectric (Peltier-based) or compressor-assisted refrigeration system coupled with resistive heating elements, the unit maintains stable setpoint temperatures across its operational range while simultaneously delivering uniform mechanical oscillation. This architecture supports applications requiring both thermal homogeneity and dynamic mixing—such as enzyme kinetics studies, cell suspension culture, solubility testing, and accelerated stability protocols under ISO 16850 or USP environmental simulation conditions. Unlike circulating baths, the DKZ series operates in non-circulating mode, minimizing cross-contamination risk and enabling direct immersion of sealed vessels—including glass vials, centrifuge tubes, and custom reaction containers—within the stainless-steel bath chamber.

Key Features

• Corrosion-resistant 304 stainless steel inner tank and lid, compliant with ISO 8502-3 surface cleanliness standards for laboratory equipment.
• Microprocessor-based PID temperature controller with ±0.3°C accuracy at 37°C (typical), 0.1°C resolution, and programmable ramp-hold profiles.
• Integrated overtemperature protection with audible/visual alarm and automatic heater cutoff, meeting IEC 61010-1 Class II safety requirements.
• Brushless AC gearmotor with stepless speed adjustment (20–300 rpm, model-dependent), delivering low vibration amplitude (<0.5 mm p-p) and acoustic noise <55 dB(A) at 1 m distance.
• Modular oscillation platform with quick-release fasteners, allowing full disassembly for cleaning and validation—critical for GLP-compliant labs performing residue audits.
• Self-diagnostic firmware monitoring heater continuity, PT100 sensor integrity, and real-time deviation from setpoint; error codes displayed via LED interface.

Sample Compatibility & Compliance

The DKZ series accommodates standard laboratory vessels up to 500 mL capacity per position, including borosilicate glass, polypropylene, and fluoropolymer-coated containers. Its open-bath configuration permits unrestricted access for pipetting, sampling, or integration with external sensors (e.g., dissolved oxygen or pH probes). Units conform to electromagnetic compatibility (EMC) per EN 61326-1 and electrical safety per EN 61010-1. Optional multi-segment programming modules support audit-ready operation logs aligned with FDA 21 CFR Part 11 requirements when paired with Yiheng’s certified data acquisition software (sold separately). All models are manufactured under ISO 9001-certified quality management systems.

Software & Data Management

While the base DKZ series operates via front-panel controls, optional programmable controllers enable advanced protocol automation. The 7-segment × 63-step scheduler allows users to define time-temperature-shake sequences with independent ramp rates (0.1–10.0°C/min), dwell durations (1 min to 99 h 59 min), and oscillation speed transitions. Each program includes auto-restart after power interruption and timestamped event logging stored internally (up to 10,000 entries). When connected to a PC via RS-232 or USB-to-serial adapter, raw thermal and motion data can be exported in CSV format for traceability in LIMS or ELN environments. Firmware updates are performed via secure bootloader protocol without hardware modification.

Applications

• Biological sample incubation with agitation (e.g., bacterial growth curves, protein refolding assays)
• Chemical dissolution rate testing per USP and Ph. Eur. 2.9.35
• Calibration of temperature-sensitive analytical instruments (e.g., viscometers, spectrophotometers)
• Stability testing of pharmaceutical formulations under ICH Q1A(R2) long-term and accelerated conditions
• Preparation of homogeneous suspensions for particle size analysis (ISO 13320) or zeta potential measurement
• Environmental simulation for materials testing per ASTM D3418 and ISO 62

FAQ

Does the DKZ series support external temperature probe input for chamber monitoring?
Yes—models equipped with optional analog output (0–5 V or 4–20 mA) can interface with third-party data loggers or SCADA systems using calibrated external PT100 or thermistor probes.
Is the oscillation motion orbital or reciprocating?
Standard configurations provide horizontal orbital shaking (25 mm diameter); reciprocating motion is available upon request for specialized applications such as sediment resuspension.
Can the bath operate continuously at 4°C for extended periods?
Units with refrigeration capability (DKZ-B/C variants) maintain 4°C continuously under typical lab ambient conditions (≤25°C, ≤60% RH), subject to proper ventilation clearance (≥10 cm on all sides).
What maintenance intervals are recommended for long-term reliability?
Annual verification of temperature uniformity (per ASTM E1112), biannual cleaning of condenser coils (refrigerated models), and quarterly inspection of motor coupling integrity are advised per Yiheng’s Maintenance Protocol MP-DKZ-2023.
Are CE or UL certifications available for export to North America or the EU?
CE marking is standard on all units shipped to EEA markets; UL 61010-1 certification is available for North American distribution under model-specific documentation packages.