Shanghai Youyi DHG-9625A Precision Forced-Air Drying Oven (620 L, 300 °C)

Overview

The Shanghai Youyi DHG-9625A is a high-capacity, precision forced-air drying oven engineered for rigorous laboratory and industrial thermal processing applications. Designed in accordance with GB/T 30435–2013 (General Technical Requirements for Electrically Heated Drying Ovens), this vertical cabinet-style oven employs a robust convection-based heating architecture to deliver stable, repeatable thermal environments across its 620 L stainless-steel chamber. Its operational temperature range spans from ambient +20 °C to 300 °C—enabling use in drying, baking, sterilization, polymer curing, moisture loss determination, and pre-conditioning of materials prior to analytical testing. The system integrates a microprocessor-controlled PID temperature regulation loop with real-time monitoring and digital feedback, ensuring minimal thermal drift and high reproducibility under load. Unlike natural-convection ovens, the DHG-9625A utilizes an optimized rear-mounted air duct system with adjustable intake/exhaust ports and a high-efficiency centrifugal blower to maintain uniform airflow distribution—critical for minimizing spatial thermal gradients and meeting ISO/IEC 17025 traceability requirements in accredited laboratories.

Key Features

• Intelligent microcomputer control system with LCD menu-driven interface: simultaneous display of setpoint temperature, actual chamber temperature, and remaining timer duration
• Programmable timer (1–9999 minutes) with auto-shutdown and power-failure recovery function—retains user-defined parameters after interruption
• Double-layer tempered glass observation window with wide-angle viewing field for non-intrusive process monitoring without door opening
• High-strength cold-rolled steel outer casing with electrostatic epoxy-polyester powder coating; corrosion-resistant mirror-finish SUS304 stainless-steel interior chamber and adjustable chrome-plated wire shelves (4 standard trays included)
• High-temperature silicone door gasket ensures long-term sealing integrity and thermal efficiency at elevated temperatures
• Dual independent safety systems: primary PID controller + optional over-temperature cut-off unit (alarm threshold user-configurable, hardware-limited interruption)
• Rear-mounted automatic air exchange ducts with passive humidity venting—eliminates manual damper adjustment and prevents condensate accumulation during prolonged low-temperature drying cycles

Sample Compatibility & Compliance

The DHG-9625A accommodates a broad spectrum of sample types and container formats—including Petri dishes, weighing boats, crucibles, glassware, polymer sheets, electronic assemblies, and biological substrates—without compromising thermal stability or cross-contamination risk. Its chamber geometry and airflow design support uniform heat transfer to both flat and volumetric samples, making it suitable for ASTM D2240 (Shore hardness conditioning), ISO 293 (thermoplastic sheet conditioning), USP (dry-heat sterilization validation), and pharmacopeial residual solvent removal protocols. All electrical components comply with IEC 61010-1 safety standards for laboratory equipment. The oven’s construction and performance metrics are fully aligned with GB/T 30435–2013, and its temperature uniformity profile (±2.5% at 100 °C, empty chamber) satisfies GLP/GMP environmental qualification prerequisites for equipment used in regulated quality control laboratories.

Software & Data Management

While the base configuration operates via embedded firmware, optional RS485 serial interface enables integration into centralized lab data acquisition networks using Modbus RTU protocol. When paired with supplied PC software, users can log time-stamped temperature records, generate CSV-formatted reports, and export calibration verification datasets compliant with FDA 21 CFR Part 11 audit-trail requirements (electronic signature and change history enabled). Optional embedded thermal printer provides hard-copy output of real-time temperature curves and cycle completion certificates—ideal for batch documentation in pharmaceutical manufacturing or food safety labs. For advanced process control, the multi-segment programmable controller (optional add-on) supports up to 30 ramp-hold segments per program, facilitating complex thermal profiles required in material annealing or accelerated aging studies.

Applications

• Drying of moisture-sensitive powders, granules, and filter papers in QC/QA laboratories
• Pre-drying of samples prior to Karl Fischer titration or gravimetric moisture analysis (ASTM E180, ISO 5555)
• Heat treatment of metal specimens, ceramic green bodies, and composite laminates
• Thermal stabilization of reference standards and calibration artifacts
• Sterilization of glassware and stainless-steel tools via dry-heat exposure (160 °C for 2 hours or 180 °C for 30 minutes)
• Curing of adhesives, coatings, and encapsulants in electronics and aerospace prototyping
• Baking of electrodes, battery separators, and porous membrane substrates

FAQ

What is the maximum recommended continuous operating temperature?
The DHG-9625A is rated for continuous operation up to 300 °C. Sustained use above 250 °C may reduce heater element service life and requires periodic verification of temperature uniformity per GB/T 30435–2013 Annex B.

Can inert gas purging be implemented for oxygen-sensitive processes?
Yes—optional inert gas inlet port with calibrated float-type flowmeter (0–10 L/min range) allows rapid nitrogen or argon atmosphere establishment. Gas compatibility must be confirmed with chamber gasket material (standard silicone rated to 250 °C).

Is third-party IQ/OQ/PQ validation support available?
Shanghai Youyi provides standardized validation templates (including test protocols, acceptance criteria, and blank record forms) compatible with ISO/IEC 17025 and GMP Annex 15. On-site qualification assistance is available upon request.

How is temperature uniformity verified during routine maintenance?
Uniformity assessment follows GB/T 30435–2013 Clause 6.4.3: nine thermocouple probes placed on three horizontal planes (top/middle/bottom) at defined grid points, with data logged at 1-minute intervals over 30 minutes after thermal stabilization.

Are custom chamber configurations or non-standard voltage options supported?
Yes—Shanghai Youyi offers OEM engineering services for modified dimensions, alternative insulation thicknesses, specialized shelving, and dual-voltage (220/380 V) configurations. Lead time and certification implications apply.