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

Overview

The Yoyi DHG-9640A is a vertically oriented, forced-air constant-temperature drying oven engineered for precision thermal processing in regulated laboratory and industrial quality control environments. It operates on the principle of convection-based heat transfer, utilizing a rear-mounted centrifugal blower and optimized air duct architecture to ensure uniform thermal distribution across its 640 L stainless-steel chamber. Designed in strict accordance with GB/T 30435–2013 (General Technical Requirements for Electrically Heated Drying Ovens), this model supports critical non-destructive thermal treatments—including moisture removal, pre-conditioning of polymeric specimens, sterilization of glassware, wax melting, and post-curing of coatings—where reproducible temperature profiles and long-term thermal stability are mandatory. Its vertical configuration maximizes floor-space efficiency while enabling ergonomic loading/unloading of large or stacked samples without compromising airflow integrity.

Key Features

• Microprocessor-controlled PID temperature regulation system with real-time digital display, offering setpoint resolution of 0.1 °C and operational stability within ±1 °C fluctuation.
• Intelligent data retention function: automatically preserves user-defined parameters—including target temperature, hold time, and alarm thresholds—during power interruption or system reset, resuming operation upon restoration of supply.
• Large-format LCD interface with menu-driven navigation; simultaneously displays set temperature, actual chamber temperature, elapsed time, and remaining hold duration.
• Dual-layer tempered glass observation window with wide-angle field of view, permitting continuous visual monitoring without thermal loss or door opening.
• Robust enclosure constructed from cold-rolled steel with electrostatic epoxy-polyester coating; interior chamber fabricated from electropolished SUS304 stainless steel for corrosion resistance and cleanability.
• High-efficiency forced-air circulation system featuring rear-mounted axial fan and symmetrically distributed air inlets/outlets, achieving ≤±2.5% temperature uniformity at 100 °C (per GB/T 30435 test protocol).
• Integrated automatic exhaust and intake ports with passive humidity venting capability—eliminates manual damper adjustment and prevents condensate accumulation during extended low-temperature drying cycles.
• Independent mechanical over-temperature cut-off circuit (optional), compliant with IEC 61000-4-5 surge immunity standards, providing fail-safe protection against controller failure.

Sample Compatibility & Compliance

The DHG-9640A accommodates diverse sample geometries via three adjustable stainless-steel shelves (standard), with maximum load capacity supporting up to 30 kg per shelf under static conditions. Its chamber geometry and airflow design are validated for homogeneous heating of biological culture plates, polymer pellets, ceramic green bodies, printed circuit board assemblies, and pharmaceutical excipient batches. The unit meets GB/T 30435–2013 requirements for thermal performance, electrical safety (GB 4793.1), and electromagnetic compatibility (GB/T 18268.1). While not certified to ISO/IEC 17025 or ASTM E145 as a standalone metrological instrument, it serves as a qualified auxiliary thermal platform in GLP-compliant laboratories when operated under documented SOPs and routine verification using NIST-traceable thermocouples.

Software & Data Management

The standard configuration includes RS485 serial interface (optional) compatible with Modbus RTU protocol, enabling integration into centralized lab management systems for remote parameter setting, real-time temperature logging, and alarm event capture. Optional embedded thermal printer provides hard-copy records of temperature/time profiles—suitable for audit trails in GMP-regulated environments where 21 CFR Part 11 compliance is required (when paired with validated third-party software). Data export formats include CSV and XML, supporting traceability workflows aligned with ISO 9001:2015 clause 8.5.2 (Identification and traceability) and ISO 13485:2016 clause 7.5.10 (Production process controls).

Applications

• Moisture content determination per AOAC 950.46 and ASTM D2298 in food, feed, and agricultural commodities.
• Thermal aging studies of elastomers and thermoplastics per ISO 188 and ASTM D573.
• Baking and curing of powder-coated metal substrates prior to salt-spray testing (ASTM B117).
• Pre-drying of filter membranes and gravimetric sample holders in environmental water analysis (EPA Method 160.1).
• Depyrogenation of glass vials and stoppers in pharmaceutical packaging lines (USP ).
• Accelerated stability testing of medical device packaging per ISO 11607-1 Annex A.

FAQ

What is the maximum allowable operating temperature for the DHG-9640A?
The rated upper limit is 250 °C, verified under continuous-load conditions per GB/T 30435–2013 Clause 5.3.1.
Does the oven support programmable multi-segment temperature ramps?
Yes—when equipped with the optional multi-stage programmable controller (order code: DHG-PC-12), it executes up to 12 ramp/soak segments with independent rate and dwell settings.
Can inert gas purging be implemented for oxygen-sensitive materials?
An optional inert gas inlet port with calibrated rotameter (0–10 L/min range) is available; installation requires factory modification and validation per ISO 8573-1 Class 4 purity requirements.
Is calibration documentation provided with shipment?
A factory-as-built temperature uniformity report (at 100 °C and 200 °C) and electrical safety test certificate are included; full ISO/IEC 17025 calibration must be performed onsite by an accredited provider.
What maintenance intervals are recommended for optimal thermal performance?
Blower motor lubrication and door gasket inspection every 6 months; chamber cleaning with pH-neutral detergent after each use involving volatile organics or saline solutions.