Yoyi DHG-9925A Vertical Forced-Air Constant-Temperature Drying Oven (1000 L Capacity)

Overview

The Yoyi DHG-9925A is a vertically oriented, forced-air convection drying oven engineered for precise thermal processing in demanding laboratory and industrial environments. Designed in accordance with GB/T 30435–2013 (the Chinese national standard for electric heating constant-temperature ovens), this 1000 L capacity unit delivers stable, uniform heat distribution across its large stainless-steel chamber—making it suitable for drying, baking, sterilization, polymer curing, moisture loss analysis, and pre-conditioning of samples prior to analytical testing. Its robust thermal architecture relies on a rear-mounted axial fan and optimized ducted airflow path to ensure rapid temperature recovery and minimized thermal gradients. The oven operates within a wide controllable range of RT+10 °C to 300 °C, supporting applications from low-temperature desiccation to high-temperature thermal stabilization of materials such as ceramics, composites, and pharmaceutical excipients.

Key Features

• Microprocessor-based intelligent temperature controller with dual PID algorithms for high reproducibility and minimal overshoot
• LCD graphical interface enabling simultaneous display of setpoint temperature, real-time chamber temperature, and remaining/elapsed timer duration
• Power-failure memory function: automatically restores previously configured parameters—including temperature setpoint, timer value, and operational mode—upon power resumption
• Double-layer tempered glass observation window with integrated anti-fog coating for continuous visual monitoring without thermal interruption
• Heavy-duty cold-rolled steel outer casing with electrostatic epoxy-polyester powder coating; interior chamber constructed from electropolished SUS304 stainless steel for corrosion resistance and easy decontamination
• High-efficiency forced-air circulation system with adjustable horizontal air baffles and rear-mounted intake/exhaust ports for passive humidity evacuation
• Independent mechanical over-temperature cut-off circuit (optional) compliant with IEC 61000-4-2 immunity requirements, providing fail-safe protection against thermal runaway
• Configurable auxiliary interfaces including RS485 communication port (Modbus RTU protocol), analog output (4–20 mA), and optional thermal printer module for audit-ready data logging

Sample Compatibility & Compliance

The DHG-9925A accommodates diverse sample geometries via three adjustable stainless-steel shelving tiers (standard configuration), with load capacity up to 50 kg per shelf. It supports routine validation protocols under GLP and GMP frameworks, particularly for stability-indicating assays, residual solvent removal, and dry-heat sterilization cycles (e.g., depyrogenation at ≥250 °C for 45 minutes). While not certified to ISO 17025 or ASTM E145, the oven’s performance characteristics—including temperature uniformity (±2.5% at 100 °C), stability (±1 °C), and resolution (0.1 °C)—are verifiable using calibrated NIST-traceable thermocouples and documented per internal SOPs. Optional inert gas purging (via standardized 1/4″ BSP inlet with integrated rotameter) enables oxygen-sensitive processing aligned with USP guidelines for anaerobic drying.

Software & Data Management

The embedded control firmware supports time-stamped event logging (start/stop, alarm triggers, parameter changes) stored internally for ≥30 days. When equipped with the RS485 interface and companion PC software (Yoyi OvenLink v3.2), users can export CSV-formatted temperature profiles synchronized with system clock, generate calibration reports, and configure multi-step ramp-soak-hold programs. All electronic records comply with FDA 21 CFR Part 11 requirements when deployed with user authentication, electronic signatures, and audit trail activation—facilitating regulatory submissions in pharmaceutical and medical device manufacturing contexts.

Applications

• Drying of biological tissues, filter papers, and chromatographic media in environmental and clinical laboratories
• Baking and post-curing of epoxy-coated electrical components and printed circuit boards (PCBs)
• Moisture content determination per AOAC 950.46 and ISO 712 for food, feed, and agricultural commodities
• Thermal aging studies of elastomers, adhesives, and packaging films per ASTM D573 and ISO 188
• Pre-drying of ceramic green bodies and sintering support fixtures prior to furnace processing
• Depyrogenation of glassware and stainless-steel tools in cleanroom-compatible workflows

FAQ

What is the maximum operating temperature and how is thermal safety ensured?
The DHG-9925A is rated for continuous operation up to 300 °C. Safety is enforced through dual redundant systems: a programmable electronic over-temperature alarm (user-configurable threshold) and an independent mechanical limit switch that physically interrupts power if chamber temperature exceeds 320 °C.
Can this oven be validated for IQ/OQ/PQ in regulated environments?
Yes—its stable thermal performance, digital logging capability, and configurable alarm thresholds support full qualification under GAMP 5 principles. Customers routinely perform mapping studies using 9- or 15-point sensor arrays per ISO 14644-3 recommendations.
Is the chamber volume truly 1000 L, and how is usable space affected by airflow design?
Chamber net volume is 1000 L (1000 × 600 × 1600 mm). Airflow optimization preserves ≥92% of nominal volume as unobstructed working area; baffle placement ensures laminar flow above and below shelves without compromising thermal homogeneity.
Does the oven meet international electromagnetic compatibility (EMC) standards?
It conforms to GB/T 18268.1–2010 (equivalent to IEC 61326-1:2012 Class A) for industrial environments, with conducted and radiated emissions tested per CISPR 11.
Are custom modifications available for specialized process requirements?
Yoyi offers OEM engineering services including modified door configurations (e.g., double-door access), extended temperature ranges (up to 400 °C), integrated vacuum manifolds, and bespoke shelving layouts—subject to mechanical and thermal feasibility review.