JingHong DHG-9240A & DHG-9240Y Forced-Air Drying Oven

Overview

The JingHong DHG-9240A and DHG-9240Y are precision-engineered forced-air drying ovens designed for consistent thermal processing in laboratory, quality control, and industrial R&D environments. These models operate on the principle of convective heat transfer via a low-noise centrifugal blower and optimized internal airflow ducting, ensuring uniform temperature distribution across the entire 225 L working chamber (500 × 600 × 750 mm). With a controllable temperature range from ambient +10°C up to 200°C and a high-resolution digital PID controller offering 0.1°C setpoint resolution and ±1°C temperature uniformity, the DHG-9240 series meets fundamental requirements for drying, baking, sterilization, and pre-conditioning of samples per ISO 17025-compliant workflows. The stainless steel interior—resistant to corrosion, oxidation, and repeated cleaning with mild alkaline or alcohol-based agents—supports long-term reliability under routine use in chemistry, materials science, pharmaceutical QC, and food testing laboratories.

Key Features

• Stainless steel interior chamber (304 grade) for enhanced durability, chemical resistance, and ease of decontamination
• Microprocessor-based PID temperature controller with dual digital display (setpoint and actual temperature), auto-tuning capability, and power-limiting function to prevent overshoot
• Forced-air circulation system featuring a low-noise axial fan and symmetrical air duct design to minimize thermal gradients (<±1°C across chamber volume)
• Intuitive front-panel interface with timer function (up to 9999 minutes), enabling unattended operation for extended drying cycles
• Robust insulated double-wall construction with high-density mineral wool insulation, reducing external surface temperature and energy consumption
• Over-temperature protection circuit independent of main controller, complying with IEC 61010-1 safety requirements for laboratory equipment

Sample Compatibility & Compliance

The DHG-9240A and DHG-9240Y accommodate a broad spectrum of sample formats—including Petri dishes, weighing boats, glassware, metal trays, polymer films, and ceramic substrates—without risk of cross-contamination due to non-porous stainless steel surfaces. The oven is suitable for applications aligned with ASTM D1654 (corrosion testing), ISO 712 (moisture content in cereals), USP (sterile processing validation support), and GB/T 29251–2012 (Chinese national standard for electric heating ovens). While not certified for Class II biological safety or explosion-proof operation, its design supports GLP documentation practices through traceable temperature logging (when paired with external data loggers) and repeatable process parameters essential for method validation under ISO/IEC 17025.

Software & Data Management

These models operate as standalone instruments without embedded software or network connectivity. However, they are fully compatible with third-party temperature monitoring systems via analog 0–5 V or 4–20 mA output signals (optional accessory). When integrated into regulated environments, users may deploy validated external data loggers compliant with FDA 21 CFR Part 11 requirements—including electronic signatures, audit trails, and secure data export—to satisfy GMP/GLP record retention mandates. The microcontroller retains last-set parameters after power interruption, minimizing setup time during routine daily operation.

Applications

• Drying moisture-sensitive powders, granules, and filter papers in environmental and pharmaceutical labs
• Baking ceramic green bodies and sintering aids prior to high-temperature firing
• Pre-drying soil, aggregate, or biomass samples before gravimetric moisture analysis (e.g., ASTM D2234, ISO 11464)
• Conditioning reference standards and calibration weights per ISO 5725 guidelines
• Melting and solidifying waxes, resins, and encapsulants during formulation development
• Low-temperature sterilization of glassware and stainless steel tools where autoclaving is impractical

FAQ

Is the DHG-9240A suitable for sterilization of medical devices?
No — this model is not validated for microbiological sterilization (e.g., SAL 10⁻⁶) and lacks steam generation, vacuum capability, or HEPA filtration required for sterile processing. It may be used for dry-heat depyrogenation of glassware at ≥250°C, but the DHG-9240A’s maximum temperature is 200°C.
Can the oven be calibrated internally?
Yes — the PID controller supports user-accessible offset calibration using a traceable NIST-certified thermometer; full factory calibration certificates are available upon request.
What is the typical warm-up time to reach 150°C?
Approximately 22–28 minutes from ambient conditions, depending on chamber load and ambient humidity.
Does the DHG-9240Y differ functionally from the DHG-9240A?
The DHG-9240Y variant includes an additional analog output port and optional RS485 Modbus RTU interface for integration into building management or centralized lab automation systems.
Are replacement parts such as fans or heating elements available internationally?
Yes — JingHong provides global spare parts support including fan assemblies, silicone-sealed heating rods, and control boards, with lead times typically under 4 weeks ex-works Shanghai.