Yoyi DHGL-9075A Vertical Forced-Air Constant-Temperature Drying Oven

Overview

The Yoyi DHGL-9075A is a vertically oriented, microprocessor-controlled forced-air 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 an optimized rear-mounted air circulation system with adjustable intake and exhaust ports to ensure uniform temperature distribution across the stainless-steel working chamber. Designed to meet GB/T 30435–2013 — the Chinese national standard for electrically heated forced-air ovens — the DHGL-9075A delivers stable thermal performance across its full operating range of RT+10°C to 300°C, with a typical temperature fluctuation of ±1.0°C and uniformity of ±2.5% at 100°C under no-load conditions. Its robust architecture supports applications requiring repeatable thermal exposure, including moisture loss determination, polymer curing, pre-weighing sample conditioning, sterilization of glassware, and thermal stability testing of electronic components.

Key Features

• Microcomputer-based PID temperature controller with intuitive LCD menu interface displaying setpoint, real-time chamber temperature, and remaining timer duration simultaneously
• Mirror-finish SUS304 stainless-steel interior chamber (400 × 425 × 445 mm) offering corrosion resistance, easy cleaning, and long-term dimensional stability
• Double-layer tempered glass observation window with silicone-sealed door gasket rated for continuous operation up to 300°C
• Modular forced-air system featuring rear-mounted centrifugal blower, independently adjustable inlet/exhaust dampers, and integrated condensate venting path
• Power-fail recovery function preserving user-defined parameters and resuming operation upon power restoration
• Independent over-temperature cut-off circuit (optional) compliant with IEC 61000-4-2 immunity requirements for fail-safe thermal protection
• Electrostatically coated cold-rolled steel exterior (545 × 580 × 800 mm) with reinforced structural frame for vibration-damped placement on standard lab benches

Sample Compatibility & Compliance

The DHGL-9075A accommodates a wide variety of sample types, including but not limited to petri dishes, weighing boats, crucibles, glass vials, PCB substrates, polymer pellets, and botanical specimens. Its chamber volume (75 L) and adjustable stainless-steel shelving (standard: two removable trays) support multi-tiered batch processing without airflow obstruction. The unit complies with GB/T 30435–2013 for thermal accuracy, stability, and safety interlocks. While not certified to ISO/IEC 17025 or GLP as a standalone instrument, its design facilitates integration into validated workflows when paired with external calibration protocols (e.g., using NIST-traceable PT100 probes). Optional RS485 communication enables audit-ready data logging aligned with FDA 21 CFR Part 11 requirements when used with compliant software platforms.

Software & Data Management

The built-in controller supports time-stamped temperature logging via optional RS485 interface (Modbus RTU protocol), enabling seamless integration with LabVIEW, MATLAB, or custom SCADA systems. An optional embedded thermal printer provides hard-copy records of temperature profiles, start/stop timestamps, and alarm events — essential for QC documentation in food safety (HACCP), pharmaceutical stability studies (ICH Q1), and materials certification. All parameter changes are logged internally with timestamp and operator ID fields (when configured with external authentication). Firmware supports firmware-upgradable functionality, ensuring long-term compatibility with evolving laboratory informatics standards.

Applications

• Moisture content analysis per AOAC 950.46 and ASTM D2231 for agricultural, feed, and pharmaceutical raw materials
• Baking and pre-drying of filter papers, silica gel plates, and chromatography media prior to analytical use
• Thermal aging of elastomers and thermoplastics per ISO 188 and ASTM D573
• Residue-on-ignition (ROI) preparation in environmental soil testing (EPA Method 9081)
• Pre-conditioning of sensors, transducers, and MEMS devices prior to calibration
• Low-risk dry-heat sterilization of non-porous instruments in academic and diagnostic labs (per WHO TRS 961 Annex 2 guidelines)

FAQ

What is the maximum recommended continuous operating temperature?
The DHGL-9075A is rated for continuous operation at 300°C; however, sustained use above 250°C may accelerate aging of the silicone door gasket and internal wiring insulation.
Can the oven be used under inert atmosphere conditions?
Yes — an optional inert gas inlet port (with calibrated float flowmeter) allows controlled nitrogen or argon purging to prevent oxidation during thermal treatment of sensitive metal powders or battery electrode materials.
Is calibration certificate included with shipment?
No — factory calibration verification data is provided; users must perform initial qualification (IQ/OQ) using third-party traceable standards per their internal SOPs.
How is temperature uniformity verified?
Uniformity is measured using nine calibrated PT100 sensors placed on a 3×3 grid at chamber center plane per GB/T 30435–2013 Annex B; results are documented in the validation report.
Are replacement shelves available as spare parts?
Yes — SUS304 wire mesh shelves (425 × 400 mm) and solid sheet variants are stocked and shipped within 5 business days globally.