JingHong DK Series Water Bath Circulators

Overview

The JingHong DK Series Water Bath is a precision-engineered, benchtop constant-temperature water bath system designed for routine thermal stabilization of samples in life science, pharmaceutical, clinical, and general chemistry laboratories. Operating on the principle of convective heat transfer via immersion in a thermally uniform aqueous medium, the DK Series provides stable, repeatable temperature environments without active fluid circulation in its base configuration (DK-8B, DK-8D). For enhanced thermal homogeneity and external process integration, the DKB-8A variant integrates an internal recirculation pump and optional external port connections—enabling controlled delivery of constant-temperature water to auxiliary equipment such as reaction jackets or external sensors. All models comply with standard laboratory safety requirements for Class I electrical appliances and are constructed with 304 stainless steel interiors and lids to ensure corrosion resistance, ease of cleaning, and long-term dimensional stability under repeated thermal cycling.

Key Features

• 304 stainless steel inner tank and lid—resistant to oxidation, chemical splashes, and repeated sterilization cycles
• Microprocessor-based PID temperature controller with dual-digit LED display showing both setpoint and real-time bath temperature
• PID auto-tuning capability ensures rapid thermal equilibration and minimizes overshoot during startup or load changes
• Over-temperature safety cutoff (typically ≥110°C) prevents uncontrolled heating and protects samples and equipment
• Stable thermal performance: ±0.5°C temperature uniformity across the working volume at steady state (per ISO 17025-relevant verification protocols)
• Modular design accommodates multiple configurations: single-zone (DK-8B), triple independent zones (DK-8D), or internally recirculating (DKB-8A)

Sample Compatibility & Compliance

The DK Series supports glassware (e.g., beakers, flasks, test tubes), plastic containers rated for continuous immersion at ≤100°C, and sealed sample vials used in enzymatic assays, dissolution testing, and cell culture pre-warming. Its construction and operational parameters align with general laboratory good practice (GLP) documentation standards. While not certified to ISO/IEC 17025 for accredited calibration, the system is suitable for use in non-regulated QC/QA workflows and educational applications. Temperature stability data may be recorded manually or via optional analog output interfaces for basic traceability in GxP-adjacent environments.

Software & Data Management

The DK Series operates via embedded firmware without proprietary software dependencies. Temperature setpoints and real-time readings are accessible through the front-panel interface only. No USB, Ethernet, or Bluetooth connectivity is provided. For laboratories requiring electronic recordkeeping, third-party data loggers (e.g., Omega OM-DAQPRO series) may be interfaced using the optional 0–5 V or 4–20 mA analog output (available on DKB-8A upon request). The system does not support FDA 21 CFR Part 11-compliant audit trails or user access controls; therefore, it is intended for use in non-critical, non-GMP production settings where manual logging satisfies quality system requirements.

Applications

• Enzyme activity assays requiring precise incubation at 37°C, 60°C, or other defined temperatures
• Sample thawing and reconstitution of lyophilized reagents
• Pre-heating solvents prior to HPLC or GC injection
• Calibration of temperature-sensitive probes and sensors
• Controlled melting point determination for low-melting-point standards
• Supporting ASTM D92 (Cleveland Open Cup Flash Point) and ISO 3679 test methods where water bath immersion is specified

FAQ

Does the DK-8D model allow simultaneous operation at three different temperatures?
Yes—the DK-8D features three physically isolated chambers, each with independent heating elements and PID controllers, enabling concurrent maintenance of distinct setpoints within the ambient +5°C to 99°C range.
Can the DKB-8A supply constant-temperature water to external equipment?
Yes—when equipped with the optional external outlet fitting, the DKB-8A’s internal pump delivers up to 1.2 L/min of circulated water at user-defined temperatures up to 65°C.
Is calibration documentation included with shipment?
No factory calibration certificate is supplied by default; however, users may perform in-house verification using NIST-traceable reference thermometers per ASTM E74 or ISO/IEC 17025 Annex A.3 guidelines.
What is the maximum recommended fill level for optimal temperature uniformity?
For all models, maintain water level between 2 cm below the rim and at least 2 cm above the heater element—typically corresponding to 70–90% of nominal capacity.
Are replacement parts such as heaters or controllers available separately?
Yes—JingHong supplies OEM-specified heating assemblies, PID modules, and stainless steel tank inserts under part numbers aligned to the DK Series service manual (available upon request to authorized distributors).