Yoyi DHG-9995A Large-Scale Forced-Air Constant-Temperature Drying Oven (1000 × 1000 × 1000 mm Internal Chamber)

Overview

The Yoyi DHG-9995A is a large-capacity, forced-air circulation drying oven engineered for precision thermal processing in demanding laboratory and industrial environments. Designed around the principles of convective heat transfer and uniform air distribution, it utilizes an optimized rear-mounted blower system with multi-directional airflow ducts to ensure consistent temperature distribution across its 1000 L internal volume (1000 × 1000 × 1000 mm). The chamber operates within a validated temperature range of RT+10 °C to 300 °C, with a maximum fluctuation of ±1 °C and uniformity of ±2.5% (measured at 100 °C under no-load conditions per GB/T 30435–2013). Its structural architecture integrates thermal efficiency, operational safety, and long-term stability—making it suitable for applications including moisture removal, pre-sterilization drying, polymer curing, pharmaceutical residual solvent evaporation, and thermal aging of electronic components.

Key Features

• Microprocessor-based intelligent temperature controller with real-time digital display, offering precise setpoint resolution of 0.1 °C and programmable timer (1–9999 minutes)
• Robust dual-layer tempered glass observation window with high-visibility framing—enabling continuous visual monitoring without thermal interruption
• Mirror-finish SUS304 stainless steel interior chamber and adjustable stainless steel shelving (standard configuration: 3–4 trays, load-rated up to 15 kg per shelf)
• High-efficiency centrifugal fan with rear-mounted air intake and automatic exhaust port—ensuring rapid moisture evacuation and minimizing manual intervention
• Dual safety architecture: primary PID control loop + independent mechanical overtemperature cut-off (optional), compliant with Class II electrical safety standards
• Electrostatically coated cold-rolled steel exterior with reinforced structural frame; high-temperature silicone door gasket rated for continuous operation up to 300 °C
• Modular design supporting optional accessories—including RS485 communication interface (with Modbus RTU protocol), embedded thermal printer, inert gas inlet port with calibrated float flowmeter (0–10 L/min), and multi-segment programmable controller

Sample Compatibility & Compliance

The DHG-9995A accommodates a broad spectrum of sample types—from bulk biological matrices and ceramic green bodies to PCB assemblies and composite laminates—without compromising thermal integrity or dimensional stability. Its stainless steel chamber resists corrosion from organic solvents, weak acids, and alkaline residues common in QC/QA workflows. The unit conforms to GB/T 30435–2013 (General Technical Requirements for Electric Hot Air Circulation Ovens), and its electrical design meets IEC 61010-1:2010 safety requirements for laboratory equipment. Optional configurations support GLP/GMP-aligned data integrity: when equipped with RS485 + dedicated software, the system provides timestamped temperature logging, user-access audit trails, and exportable CSV reports—facilitating compliance with FDA 21 CFR Part 11 for electronic records in regulated environments.

Software & Data Management

While the base model features a standalone LCD interface with intuitive menu navigation, optional connectivity modules enable integration into centralized lab infrastructure. The RS485 interface supports bidirectional communication with SCADA systems or LIMS platforms via standard Modbus RTU protocol. Included PC software allows remote parameter setting, real-time graphing of chamber temperature profiles, alarm event logging (e.g., overtemp, power failure), and automated report generation. All logged data include ISO 8601 timestamps, operator ID fields, and checksum-verified integrity validation—critical for traceability in ISO/IEC 17025-accredited laboratories. Optional embedded thermal printers produce hard-copy records compliant with internal SOPs requiring physical audit trails.

Applications

• Pharmaceutical: Residual solvent removal from active pharmaceutical ingredients (APIs), excipient drying prior to tablet compression, and stability testing per ICH Q1 guidelines
• Materials Science: Thermal conditioning of carbon fiber prepregs, post-cure cycles for epoxy composites, and moisture content analysis per ASTM D4442
• Electronics Manufacturing: Pre-bake of PCB substrates, solder paste drying, and humidity preconditioning before reliability testing (e.g., JEDEC J-STD-020)
• Food & Agriculture: Moisture determination in grains and feedstuffs (AOAC 950.46), enzyme inactivation studies, and shelf-life acceleration protocols
• Academic Research: Controlled thermal degradation kinetics, catalyst activation, and polymer crosslinking optimization under reproducible ambient conditions

FAQ

What is the maximum operating temperature and thermal class rating of the DHG-9995A?
The unit is rated for continuous operation up to 300 °C and classified as Class H insulation per IEC 60085, ensuring safe performance under sustained high-temperature loads.
Can the oven be validated for IQ/OQ/PQ protocols?
Yes—its stable thermal profile, documented calibration traceability (NIST-traceable reference sensors available upon request), and optional data logging capability support full GxP validation across Installation, Operational, and Performance Qualification stages.
Is inert atmosphere operation supported out-of-the-box?
An optional inert gas inlet kit (including SS quick-connect fitting and calibrated float flowmeter) enables nitrogen or argon purging; users must supply external gas source and pressure regulator.
How is temperature uniformity verified during factory acceptance testing?
Each unit undergoes 9-point thermocouple mapping (per ISO 14644-3 Annex B methodology) at 100 °C and 250 °C under no-load conditions, with results provided in the Certificate of Conformance.
Are custom chamber configurations or non-standard voltages available?
Yoyi offers OEM engineering services for modified dimensions, voltage variants (e.g., 208 V / 60 Hz), explosion-proof enclosures (ATEX-certified variants on request), and specialized shelving layouts—subject to minimum order quantity and lead time agreement.