Shanghai Youyi DHG-9925A 1000L Precision Forced-Air Drying Oven

Overview

The Shanghai Youyi DHG-9925A is a high-capacity, precision-engineered forced-air drying oven designed for demanding laboratory and industrial thermal processing applications. Engineered for stability, repeatability, and long-term operational integrity, this 1000 L vertical drying oven employs a robust convection-based thermal management architecture—utilizing a rear-mounted centrifugal blower, optimized wind tunnel design, and multi-directional air distribution ducts—to ensure uniform heat distribution throughout the entire chamber volume. Its temperature control system conforms to GB/T 30435–2013, the Chinese national standard for electric heating ovens used in laboratory environments, and supports traceable thermal validation under GLP-aligned workflows. The unit operates across a wide thermal range of RT+20°C to 300°C with a certified fluctuation tolerance of ±1°C and uniformity of ±2.5% (measured at 100°C under no-load conditions), making it suitable for drying, baking, sterilization, polymer curing, moisture loss analysis, and pre-conditioning of samples prior to instrumental analysis.

Key Features

• Microprocessor-based intelligent temperature controller with dual PID algorithms, enabling precise setpoint tracking and adaptive compensation for load-induced thermal inertia
• Large-format LCD interface with menu-driven navigation—displays real-time chamber temperature, set temperature, elapsed time, remaining hold time, and system status simultaneously
• Non-volatile memory retention: automatically saves all user-defined parameters—including temperature profiles, timer settings, and alarm thresholds—in the event of power interruption or system reset; resumes operation upon power restoration
• Double-layer tempered glass observation window with anti-fog coating, providing unobstructed visual monitoring without compromising thermal insulation or safety integrity
• Electrostatically coated cold-rolled steel exterior housing combined with a mirror-polished SUS304 stainless steel interior chamber and adjustable stainless steel shelving (standard configuration: 3 shelves)
• High-performance silicone rubber door gasket rated for continuous use up to 350°C, ensuring low-leakage sealing and extended service life
• Integrated rear-mounted auto-intake and exhaust ports linked to the circulation system—enabling passive vapor removal during humidification-sensitive processes without manual damper adjustment
• Optional independent over-temperature cut-off circuit (certified to Class II safety standards) that physically interrupts heating power if chamber temperature exceeds user-defined safety limits

Sample Compatibility & Compliance

The DHG-9925A accommodates diverse sample types—including glassware, metal components, polymer sheets, ceramic substrates, biological culture plates, pharmaceutical excipients, and electronic assemblies—within its spacious 1000 L chamber. Its stainless steel interior resists corrosion from mild organic solvents, saline solutions, and acidic vapors commonly encountered in QC/QA labs. The oven meets structural and performance requirements specified in GB/T 30435–2013 and is compatible with internationally recognized validation protocols, including IQ/OQ/PQ documentation frameworks. While not inherently compliant with FDA 21 CFR Part 11 out-of-the-box, optional RS485 communication modules enable integration into validated data acquisition systems supporting electronic audit trails, user access controls, and secure data export—facilitating alignment with GMP, ISO/IEC 17025, and ISO 9001 quality management systems.

Software & Data Management

As a standalone instrument, the DHG-9925A features embedded firmware supporting programmable ramp-hold cycles, timer-based shutdown, and alarm logging with timestamped event records stored in non-volatile memory. For enhanced data governance, optional accessories include an RS485 serial interface paired with proprietary PC software (Windows-compatible) that enables remote parameter configuration, real-time temperature graphing, CSV-formatted data export, and automated report generation. An embedded thermal printer (optional) provides hard-copy output of temperature logs, start/stop timestamps, and deviation alerts—supporting paper-based audit readiness where required. All digital interfaces comply with standard Modbus RTU protocol conventions, allowing interoperability with SCADA platforms and centralized lab information management systems (LIMS).

Applications

• Drying of moisture-sensitive powders and granules in pharmaceutical manufacturing and quality control
• Baking and post-curing of epoxy-coated PCBs, sensor housings, and aerospace composite layups
• Thermal stabilization of reference standards prior to gravimetric or chromatographic analysis
• Residual solvent removal from polymer films and thin-film coatings in R&D laboratories
• Pre-heating and conditioning of calibration weights, volumetric glassware, and analytical crucibles
• Heat treatment of soil, feed, and botanical samples in agricultural and environmental testing facilities
• Sterilization of reusable lab tools via dry-heat exposure (validated per ISO 17665 for microbiological lethality at ≥160°C for ≥2 hours)

FAQ

What is the maximum operating temperature and how is thermal stability maintained?
The DHG-9925A achieves a maximum operating temperature of 300°C. Stability is ensured through a combination of high-density mineral wool insulation (≥100 mm thickness), dual-stage PID temperature regulation, and continuous airflow monitoring via integrated thermistor feedback loops within the recirculation duct.

Can the oven be validated for ISO/IEC 17025-compliant calibration?
Yes—the chamber geometry, sensor placement options (including standardized 9-point mapping kits), and documented uncertainty budgets support third-party qualification per ISO/IEC 17025 Annex A.3 requirements for thermal equipment verification.

Is inert atmosphere operation supported?
An optional inert gas inlet port with calibrated rotameter (0–10 L/min range) allows nitrogen or argon purging to suppress oxidation during heat treatment of reactive metals or sensitive organics.

Are custom chamber configurations available?
Shanghai Youyi offers OEM and non-standard engineering services—including modified internal dimensions, specialized shelving layouts, reinforced door hinges, and explosion-proof electrical packages—subject to technical feasibility review and lead-time agreement.