Shanghai Youyi DHG-9245A Precision Forced-Air Drying Oven with Stainless Steel Chamber

Overview

The Shanghai Youyi DHG-9245A is a precision forced-air drying oven engineered for laboratory and industrial applications requiring stable, uniform thermal environments up to 300°C. Utilizing a robust convection-based heating architecture, the unit maintains consistent temperature distribution across its 220 L stainless steel chamber via an optimized rear-mounted air circulation system with adjustable intake and exhaust ports. Unlike natural convection ovens, this model employs a high-efficiency axial fan and laminar airflow ducting to minimize thermal stratification—critical for applications such as moisture content analysis, polymer curing, pharmaceutical stability testing, and pre-sterilization drying of glassware and instruments. Its design conforms to GB/T 30435–2013, the national standard governing performance, safety, and metrological requirements for electrically heated drying and forced-air ovens in China, ensuring traceable calibration practices and operational reliability under routine laboratory conditions.

Key Features

• Microprocessor-based PID temperature controller with intuitive LCD menu interface—displays setpoint, real-time chamber temperature, and remaining hold time simultaneously
• Mirror-finish SUS304 stainless steel interior chamber resistant to corrosion, oxidation, and repeated thermal cycling; smooth surface facilitates cleaning and residue removal
• Double-layer tempered glass observation window with silicone-sealed frame enables non-intrusive visual monitoring without compromising thermal integrity
• Intelligent power recovery function preserves user-defined parameters—including temperature setpoints and timer values—after unexpected power interruption or system reset
• Independent over-temperature cut-off circuit (optional) provides fail-safe protection by automatically de-energizing heaters when exceeding user-defined safety limits
• Modular rear ventilation system with automatic humidity expulsion eliminates manual damper adjustment and prevents condensation buildup during extended low-temperature drying cycles
• Electrostatically coated cold-rolled steel exterior offers mechanical durability and resistance to abrasion and chemical splashes in shared lab environments

Sample Compatibility & Compliance

The DHG-9245A accommodates a broad range of sample types and containers, including Petri dishes, weighing boats, crucibles, aluminum pans, glass vials, and metal trays—compatible with standard ISO/IEC 17025-compliant weighing and drying protocols. Its chamber geometry supports up to three adjustable stainless steel shelves (standard configuration), allowing flexible load arrangement without obstructing airflow paths. The oven meets essential electrical safety requirements per GB 4793.1 (equivalent to IEC 61010-1) and complies with environmental operating constraints defined in ISO/IEC 17025:2017 Annex A.2 for equipment used in accredited testing laboratories. While not inherently 21 CFR Part 11 compliant, optional RS485 serial interface enables integration with validated data acquisition systems supporting audit trails and electronic signature workflows when paired with compliant software platforms.

Software & Data Management

As a standalone benchtop instrument, the DHG-9245A operates without embedded software but supports external data logging through two configurable options: (1) an optional RS485 interface (with Modbus RTU protocol support) for integration into centralized Lab Information Management Systems (LIMS) or SCADA environments, and (2) an embedded thermal printer module (optional) delivering timestamped hard-copy records of temperature profiles and cycle completion events. All recorded data—including start time, target temperature, dwell duration, and final stabilization status—can be exported for GLP/GMP documentation purposes. Firmware updates are performed locally via USB port (not included); no cloud connectivity or remote firmware deployment is supported, preserving network security in regulated facilities.

Applications

• Determination of moisture content in foodstuffs, soil samples, and pharmaceutical excipients per AOAC 950.46 and USP <1251>
• Pre-drying of analytical filters and gravimetric vessels prior to ash content analysis (ASTM D2974, ISO 1171)
• Thermal conditioning of polymer films, elastomers, and composite substrates before tensile or adhesion testing
• Baking of printed circuit boards (PCBs) and electronic components to remove residual solvents and entrapped moisture
• Heat treatment of calibration standards, reference materials, and metrology-grade artifacts under controlled ramp-and-hold profiles
• Accelerated aging studies for packaging materials and medical device components per ISO 11607-1

FAQ

What is the maximum operating temperature and how is it maintained?
The DHG-9245A is rated for continuous operation up to 300°C. Temperature stability is achieved via a dual-sensor feedback loop combining a PT100 platinum resistance thermometer and a redundant bimetallic safety limiter, coupled with adaptive PID control logic that dynamically adjusts heater duty cycle based on load mass and ambient drift.
Is the oven suitable for inert atmosphere processing?
Yes—when equipped with the optional inert gas inlet kit (including stainless steel quick-connect fitting and calibrated rotameter), users can purge the chamber with nitrogen or argon to suppress oxidation during heat-sensitive material processing.
Can temperature uniformity be verified independently?
Absolutely. The oven’s internal geometry and airflow pattern comply with ISO 17025 clause 6.4.3 for equipment verification. Users may perform in-house uniformity mapping using NIST-traceable thermocouples placed at nine standardized locations (per GB/T 30435–2013 Annex B) and compare results against the ±2.5% specification at 100°C.
Are replacement parts available internationally?
Shanghai Youyi supplies OEM-certified components—including fan assemblies, door gaskets (high-temp silicone), and control modules—through authorized regional distributors with documented lead times and RoHS-compliant material declarations.
Does the unit support programmable multi-step temperature profiles?
Not natively. However, the optional multi-segment programmable controller (sold separately) adds up to 30 user-defined segments with ramp rate control, soak timing, and auto-cycling functionality—fully compatible with existing hardware interfaces.