Yoyilab DHG-9920A Vertical Forced-Air Constant-Temperature Drying Oven (1000 L Capacity)

Overview

The Yoyilab DHG-9920A is a vertically oriented, forced-air constant-temperature drying oven engineered for high-volume thermal processing in regulated laboratory and industrial quality control environments. With a certified internal chamber volume of 1000 liters (1000 × 600 × 1600 mm), it delivers scalable, reproducible thermal treatment across diverse applications including moisture removal, pre-weighing sample conditioning, polymer curing, pharmaceutical stability testing, and sterilization support. Its operational principle relies on a rear-mounted centrifugal blower and optimized ducted airflow architecture—designed to ensure uniform convective heat transfer throughout the entire working space. The system adheres strictly to GB/T 30435–2013, the national Chinese standard for electrically heated drying ovens, and its thermal performance metrics—including ±1°C temperature fluctuation and ±2.5% uniformity at 100°C—are validated under no-load, vibration-free, non-magnetic ambient conditions (20°C, 50% RH). This makes the DHG-9920A suitable for routine use in GLP-compliant labs where traceable, repeatable thermal exposure is required.

Key Features

• Microprocessor-based intelligent temperature controller with dual PID algorithms, supporting precise setpoint regulation, programmable timing (1–9999 minutes), and over-temperature cut-off protection
• Large-format LCD interface with menu-driven navigation: simultaneous display of set temperature, real-time chamber temperature, elapsed time, and remaining hold duration
• Double-layer tempered glass observation window with integrated anti-fog coating, enabling unobstructed visual monitoring without thermal leakage or condensation interference
• Robust structural design: cold-rolled steel outer casing with electrostatic epoxy-polyester powder coating; interior chamber fabricated from electropolished SUS304 stainless steel for corrosion resistance and cleanability
• High-efficiency horizontal air circulation system featuring adjustable stainless-steel shelves (standard configuration: 3 shelves, fully movable and repositionable)
• Integrated rear-mounted automatic intake/exhaust ports with passive humidity venting—eliminates manual damper adjustment and prevents condensate accumulation during prolonged low-temperature drying cycles
• High-temperature silicone door gasket ensures long-term sealing integrity and thermal containment up to 250°C

Sample Compatibility & Compliance

The DHG-9920A accommodates a broad spectrum of sample types and container formats—including Petri dishes, aluminum weighing pans, glass desiccators, polymer trays, and bulk material baskets—without compromising thermal homogeneity. Its chamber geometry and airflow profile have been validated for uniform heating across all load configurations within its rated capacity. The oven meets GB/T 30435–2013 requirements for temperature accuracy, recovery time, and insulation performance. While not intrinsically certified to ISO/IEC 17025 or ASTM E145, its documented thermal stability and repeatability support integration into accredited laboratories’ method validation protocols. Optional accessories—including independent over-temperature limiters, RS485 communication modules, and inert gas purging kits—enable alignment with enhanced safety and data integrity frameworks such as FDA 21 CFR Part 11 (when paired with compliant software and audit-trail-enabled controllers).

Software & Data Management

The base unit operates via embedded firmware with local parameter storage and power-loss recovery functionality: all active settings—including temperature setpoints, timer values, and alarm thresholds—are retained during unexpected shutdowns and automatically restored upon restart. For advanced data logging and remote supervision, optional RS485 interfaces enable seamless integration with SCADA systems or PC-based acquisition platforms using Modbus RTU protocol. An optional embedded thermal printer provides hard-copy records of temperature profiles, start/stop timestamps, and alarm events—supporting paper-based audit trails in GMP or ISO 9001 environments. Multi-segment programmable controllers (sold separately) extend capability to complex thermal ramp-soak-cool sequences, facilitating applications such as accelerated aging studies or solvent evaporation kinetics.

Applications

• Moisture content determination per AOAC 950.46, USP <1251>, and ISO 712 in food, feed, and agricultural commodities
• Pre-drying of filter papers, crucibles, and volumetric glassware prior to gravimetric analysis
• Curing and post-baking of epoxy-coated electronic components and PCB assemblies
• Thermal conditioning of polymer films, composites, and elastomeric test specimens per ASTM D618 and ISO 291
• Stability testing of pharmaceutical excipients and finished dosage forms under ICH Q1A(R2) guidelines
• Heat treatment of metal samples prior to tensile or hardness evaluation (within specified temperature limits)
• Residual solvent removal from coated substrates in R&D and pilot-scale manufacturing

FAQ

What is the maximum operating temperature of the DHG-9920A?
The DHG-9920A is rated for continuous operation from ambient +10°C up to 250°C.
Does the oven include calibration documentation?
Factory calibration certificates are available upon request; users are advised to perform periodic verification using NIST-traceable thermocouples or PT100 probes.
Can the DHG-9920A be used for sterilization?
While it achieves temperatures sufficient for dry-heat sterilization (e.g., 160°C for 2 hours per ISO 15693), it is not classified as a medical-grade sterilizer and lacks validation hardware (e.g., biological indicators, cycle mapping sensors).
Is inert gas purging supported natively?
Yes—via an optional accessory kit comprising a dedicated inlet port, stainless-steel flow regulator, and calibrated rotameter for controlled nitrogen or argon introduction.
What safety protections are built-in?
Standard features include over-temperature cut-off, door-open detection, and thermal fuse backup; the independent limiter (optional) adds redundant hardware-level protection.
Are custom chamber configurations available?
Yoyilab offers OEM and non-standard modifications—including altered dimensions, specialized shelving, additional access ports, and alternative insulation grades—subject to engineering review and lead-time confirmation.