Yoyilab DHG-9640A Vertical Forced-Air Constant-Temperature Drying Oven

Overview

The Yoyilab DHG-9640A is a vertically oriented, forced-air constant-temperature drying oven engineered for precision thermal processing in research laboratories, quality control environments, and industrial R&D settings. It operates on the principle of convection-based heat transfer, utilizing an optimized rear-mounted air circulation system with adjustable inlet and exhaust ports to ensure uniform thermal distribution across the 640 L working chamber. Designed to meet GB/T 30435–2013 — China’s national standard for electric heating drying ovens — the unit delivers stable, repeatable thermal conditions essential for drying, baking, sterilization, moisture removal, wax melting, and pre-conditioning of polymeric, electronic, and biological specimens. Its robust architecture supports continuous operation under load at temperatures up to 250°C, with real-time monitoring and fail-safe thermal protection integral to its operational safety framework.

Key Features

• Microprocessor-based intelligent temperature controller with PID algorithm, enabling precise setpoint regulation (0.1°C resolution) and ±1°C fluctuation tolerance under steady-state conditions.
• Large dual-layer tempered glass observation window with reinforced sealing, permitting non-intrusive visual monitoring without compromising chamber integrity or thermal stability.
• High-efficiency horizontal airflow duct design with rear-mounted blower and auto-balanced intake/exhaust valves, eliminating manual damper adjustment and minimizing condensation buildup during extended low-temperature drying cycles.
• Electropolished stainless steel interior (SUS304 grade), corrosion-resistant and easy to decontaminate; compatible with ISO 14644 cleanroom maintenance protocols and GLP-compliant cleaning validation.
• Cold-rolled steel outer casing with epoxy-polyester powder coating, providing mechanical durability and resistance to ambient laboratory abrasion and chemical splashes.
• High-temperature silicone door gasket rated for continuous service up to 300°C, ensuring long-term sealing performance and reduced thermal leakage.
• Configurable safety architecture: standard over-temperature cut-off circuit plus optional independent mechanical limit controller (UL/IEC 61000-4-5 compliant) for redundant thermal protection.

Sample Compatibility & Compliance

The DHG-9640A accommodates a broad spectrum of sample types and container formats, including Petri dishes, weighing boats, crucibles, glassware, PCB assemblies, polymer pellets, pharmaceutical excipients, and botanical matrices. Its 800 × 800 × 1000 mm chamber allows vertical stacking of up to four standard ISO 8573-1 Class 4 compliant stainless steel trays (included), with height-adjustable support rails for optimal airflow clearance. The oven conforms to GB/T 30435–2013 for performance verification, and its thermal uniformity profile (±2.5% deviation at 100°C, per ASTM E2207–22 methodology) supports data integrity requirements under ISO/IEC 17025 accredited testing environments. While not intrinsically rated for hazardous area use, optional inert gas purging (N₂ or Ar via calibrated rotameter interface) enables oxygen-sensitive processes aligned with USP packaging stability guidelines.

Software & Data Management

The integrated LCD interface supports multi-parameter display (set temperature, real-time chamber temperature, elapsed time, remaining hold time) and programmable ramp-soak profiles (via optional multi-segment controller add-on). For traceability-critical applications, the RS485 communication port (optional) enables bidirectional integration with SCADA systems or LIMS platforms using Modbus RTU protocol. When paired with the embedded thermal printer module (optional), the oven generates timestamped hardcopy logs compliant with FDA 21 CFR Part 11 Annex 11 audit trail requirements — including operator ID, parameter changes, alarm events, and cycle completion markers. All configuration data is retained through power interruption via non-volatile EEPROM memory, supporting uninterrupted operation during scheduled utility outages.

Applications

• Moisture content determination (per AOAC 950.46 and ISO 5528) in food, feed, and agricultural commodities.
• Pre-drying of filter papers, gravimetric vessels, and ceramic crucibles prior to ashing or residue analysis.
• Thermal aging studies of elastomers, adhesives, and composite laminates per ASTM D573 and ISO 188.
• Baking and curing of printed circuit board solder masks and conformal coatings under controlled convection.
• Depyrogenation of glassware and stainless steel tools in pharmaceutical manufacturing (supporting EU GMP Annex 15 qualification).
• Stabilization of reference standards and calibration artifacts under ISO/IEC 17025 environmental conditioning protocols.

FAQ

What is the maximum operating temperature and certified accuracy range?
The DHG-9640A is rated for continuous operation from ambient +10°C to 250°C. Temperature accuracy is validated per GB/T 30435–2013 at key points (e.g., 100°C, 150°C, 200°C), with typical uniformity ≤ ±2.5% and fluctuation ≤ ±1°C under no-load, stabilized conditions.

Can this oven be qualified for GMP or ISO 17025 compliance?
Yes — the unit supports IQ/OQ documentation packages, and its optional data logging and alarm history functions align with ALCOA+ data integrity principles. Third-party qualification services are available upon request.

Is inert gas purging supported natively or only as an add-on?
Inert gas compatibility requires the optional inert gas inlet kit (including stainless steel fitting, pressure regulator, and calibrated float-type flowmeter), which integrates seamlessly with the rear panel service port.

Are replacement shelves and calibration certificates available?
Standard stainless steel shelves (600 × 600 mm, 1.2 mm thickness) and NIST-traceable temperature calibration certificates (per ISO/IEC 17025) are offered as configurable accessories.