JingHong DK-500 / DK-500S Benchtop Constant-Temperature Water Bath

Overview

The JingHong DK-500 and DK-500S are precision-engineered benchtop constant-temperature water baths designed for reliable thermal stabilization of samples, reagents, and equipment in academic, industrial, and quality control laboratories. These units operate on resistive heating principles with direct immersion heating elements and employ a PID-controlled microprocessor system to maintain stable thermal environments within ±0.5°C across the operating range of ambient +5°C to 65°C. Unlike circulating or refrigerated baths, the DK-500 series is optimized for applications requiring simple, cost-effective, and energy-efficient heating without active fluid recirculation—making it particularly suitable for enzyme incubation, sample equilibration, dissolution testing preparation, and low-risk thermal conditioning where external temperature gradients are not required. The stainless steel construction ensures corrosion resistance, long-term durability, and compliance with basic hygiene standards for repeated use in multi-user lab settings.

Key Features

• High-grade 304 stainless steel inner tank and lid—resistant to oxidation, chemical exposure, and mechanical wear
• PID-based digital temperature controller with dual LED display showing both setpoint and real-time bath temperature
• 0.1°C temperature resolution enables fine-tuned process setup and documentation traceability
• Robust heating system delivering consistent thermal output: 1045 W (DK-500) and 1500 W (DK-500S) for rapid warm-up and recovery after sample insertion
• Stable thermal performance verified at ±0.5°C over extended operation periods—suitable for ISO/IEC 17025-aligned calibration workflows
• Compact footprint (655×337×300 mm) optimized for standard laboratory bench space without compromising usable bath volume (30 L nominal)
• Optional external circulation port available on certain configurations—enables integration with auxiliary equipment when external temperature transfer is required

Sample Compatibility & Compliance

The DK-500/DK-500S accommodates a wide variety of sample containers including glass beakers (up to 1000 mL), test tubes, flasks, and small-volume reaction vessels. Its open-bath design supports easy access and manual handling, while the uniform heat distribution minimizes localized hot spots. Although not certified to specific regulatory standards such as FDA 21 CFR Part 11 or ISO 13485, the unit’s design aligns with general Good Laboratory Practice (GLP) expectations for temperature-controlled ancillary equipment. It is routinely deployed in pre-analytical workflows supporting ASTM D1500 (petroleum color), USP (non-sterile compounding environment conditioning), and ISO 5725 (precision testing repeatability studies) where documented thermal stability is essential but full audit-trail software is not mandated.

Software & Data Management

These models operate via embedded hardware control only—no PC connectivity, data logging, or remote monitoring capabilities are integrated. All temperature parameters are configured and monitored locally using the front-panel keypad and dual-digit display. While lacking automated data export, the system supports manual recording protocols compatible with paper-based or spreadsheet-based lab notebooks. For users requiring electronic records, third-party USB or RS-232 data loggers can be interfaced externally using standard analog voltage outputs (if equipped per OEM configuration). No proprietary software installation or license is required, reducing IT validation burden in regulated environments.

Applications

• Pre-warming culture media and reagents prior to microbiological assays
• Thermal equilibration of viscosity standards and calibration oils
• Controlled solubilization of temperature-sensitive compounds in pharmaceutical development
• Supporting accelerated stability testing per ICH Q1A(R3) guidelines (as auxiliary thermal platform)
• Heating and maintaining reaction mixtures during non-catalytic organic synthesis steps
• Calibration support for thermometers, RTDs, and thermocouples in metrology labs
• Conditioning of polymer films and adhesives prior to tensile or peel testing

FAQ

Is the DK-500 suitable for continuous 24/7 operation?
Yes—designed for uninterrupted duty cycles with thermal cut-off protection and overheat safety limiters compliant with IEC 61010-1.
What is the difference between DK-500 and DK-500S?
The DK-500S features higher heating power (1500 W vs. 1045 W) and reduced bath depth (150 mm vs. 200 mm), resulting in faster thermal response and slightly lower liquid capacity—optimized for shallow-dip applications.
Can this bath be used with oil instead of water?
Not recommended—stainless steel tank and heater assembly are validated for aqueous use only; oil immersion may accelerate oxidation and compromise sensor accuracy.
Does the unit include a drain valve?
No—manual siphoning or pouring is required for bath emptying; no built-in drainage mechanism is provided.
Is external temperature calibration supported?
Yes—the unit accepts external PT100 probe input for independent verification; calibration certificates can be generated using NIST-traceable reference thermometers.