Yoyi DHG-9965A Vertical Large-Scale Forced-Air Constant-Temperature Drying Oven

Overview

The Yoyi DHG-9965A is a vertically oriented, large-capacity forced-air drying oven engineered for precision thermal processing in industrial and research laboratory environments. Designed according to the national standard GB/T 30435–2013 for electric heating constant-temperature ovens, it employs a robust convection-based heat transfer architecture—utilizing rear-mounted centrifugal blowers and an optimized air duct system—to ensure uniform temperature distribution across its 1000 L working chamber. Unlike natural convection ovens, this model actively circulates heated air at controlled velocity and direction, minimizing thermal gradients and enabling reproducible drying, baking, sterilization, and pre-conditioning of thermally stable samples. Its maximum operating temperature of 300°C supports applications ranging from polymer curing and moisture removal in pharmaceutical excipients to residual solvent evaporation in QC laboratories and thermal aging of electronic components.

Key Features

• Microprocessor-based PID temperature controller with intuitive LCD menu interface—displays setpoint, real-time chamber temperature, and remaining timer simultaneously
• Dual-layer tempered glass observation window with wide-angle view, facilitating non-intrusive monitoring without thermal loss or door opening
• High-efficiency forced-air circulation system featuring rear-mounted blower and directional airflow channels—achieves ±2.5% temperature uniformity (measured at 100°C per GB/T 30435)
• Mirror-finish SUS304 stainless steel interior chamber and adjustable stainless steel shelving—resistant to corrosion, easy to clean, and compatible with repeated exposure to organic solvents and cleaning agents
• Robust cold-rolled steel outer casing with electrostatic epoxy-polyester powder coating—provides mechanical durability and long-term resistance to abrasion and chemical splashes
• High-temperature silicone door gasket ensuring reliable sealing up to 300°C—minimizes heat leakage and extends service life compared to standard rubber variants
• Independent over-temperature protection circuit (optional)—automatically cuts power if chamber temperature exceeds user-defined safety limit, complying with IEC 61000-4-2 immunity requirements
• Integrated auto-ventilation ducts with rear-mounted intake/exhaust ports—enable passive moisture expulsion during extended drying cycles without manual damper adjustment

Sample Compatibility & Compliance

The DHG-9965A accommodates a broad spectrum of sample types—including bulk powders, coated substrates, packaged medical devices, ceramic green bodies, and polymer composites—within its spacious 1000×800×1300 mm chamber. Its design conforms to key regulatory expectations for thermal equipment used in GMP-compliant manufacturing and GLP-aligned testing: the microcontroller logs operational parameters (e.g., temperature setpoint, runtime, alarm events) with timestamped records when paired with optional RS485 communication; the optional embedded printer provides hard-copy audit trails suitable for FDA 21 CFR Part 11–aligned documentation workflows. While not intrinsically rated for hazardous area use, the inert gas inlet port (optional) permits nitrogen or argon purging for oxygen-sensitive processes—supporting ASTM E145–22 Class II oven classification protocols when configured accordingly.

Software & Data Management

Standard operation requires no external software—the integrated controller stores up to 99 programmable segments (with ramp/soak profiles) and retains all settings after power interruption via non-volatile memory. Optional RS485 interface enables bidirectional communication with third-party SCADA or LIMS platforms using Modbus RTU protocol; accompanying PC software (supplied on USB drive) allows real-time graphing, data export to CSV/XLSX, and configurable alarm notifications. The optional thermal printer outputs continuous strip charts or discrete event logs—including start/stop timestamps, deviation alerts, and temperature stability windows—meeting traceability requirements for ISO/IEC 17025 accredited calibration labs and pharmaceutical stability studies per ICH Q1A(R2).

Applications

• Moisture content determination in food, feed, and agricultural products per AOAC 950.46 and ISO 665
• Thermal curing of epoxy resins, adhesives, and composite laminates in aerospace and automotive R&D
• Pre-drying of filter membranes and chromatography columns prior to analytical validation
• Accelerated aging tests for packaging materials under controlled thermal stress (ASTM F1980)
• Residual solvent removal from active pharmaceutical ingredients (APIs) and intermediates in API synthesis suites
• Baking of printed circuit board (PCB) assemblies post-soldering to eliminate trapped moisture (JEDEC J-STD-020)
• Heat treatment of metallographic specimens prior to etching and microscopy

FAQ

What is the maximum allowable load weight per shelf?
Each adjustable stainless steel shelf supports up to 15 kg uniformly distributed. Total chamber loading should not exceed 60 kg to maintain airflow integrity and thermal uniformity.

Is the oven suitable for use with flammable solvents?
No. This is a general-purpose drying oven without explosion-proof certification. For volatile organic compounds, consult our ATEX-certified inert-atmosphere drying systems.

Can the temperature uniformity be validated per ISO 17025 requirements?
Yes. The unit includes nine standardized sensor mounting points (per GB/T 30435 Annex B) for 9-point mapping. Calibration certificates traceable to NIM (National Institute of Metrology, China) are available upon request.

Does the optional multi-segment programmer support ramp-and-soak profiles?
Yes. The optional programmable controller offers up to 99 segments with independent rate control (0.1–999.9°C/min), soak dwell times (1 min–999 h 59 min), and cycle repetition (1–999 cycles).

What maintenance intervals are recommended for optimal performance?
Blower motor lubrication every 12 months; gasket inspection every 6 months; internal chamber cleaning after each high-residue application; annual verification of temperature sensor accuracy using NIST-traceable reference thermometers.