Shanghai Youyi DHG-9309A 300L High-Temperature Forced-Air Drying Oven (RT+20°C to 500°C)

Overview

The Shanghai Youyi DHG-9309A is a 300-liter high-temperature forced-air drying oven engineered for precision thermal processing in industrial R&D, quality control, and materials testing laboratories. Designed to operate continuously within a validated temperature range of ambient +20°C to 500°C, it employs a robust convection-based heating architecture grounded in ISO 17025-aligned thermal management principles. The oven utilizes resistive electric heating elements integrated with a multi-blade centrifugal circulation fan system, ensuring rapid heat-up response and stable thermal distribution across the full working volume. Its chamber is constructed from mirror-finish stainless steel (SUS304), minimizing oxidation and facilitating cleaning under stringent GLP-compliant environments. Thermal insulation consists of high-density glass fiber mat (≥100 mm thickness), achieving low surface temperature rise (<45°C at 500°C internal setpoint) and reduced energy consumption per thermal cycle—critical for labs adhering to ISO 50001 energy management frameworks.

Key Features

• Microprocessor-controlled PID temperature regulation with auto-tuning capability and real-time deviation compensation, supporting programmable ramp-hold profiles via optional intelligent controller.
• 4.3-inch backlit LCD interface displaying setpoint, actual chamber temperature, elapsed time, and remaining hold duration; supports up to 9999-minute timer operation.
• Pre-heated air duct design: incoming ambient air passes through a dedicated pre-heating cavity before entering the working chamber, eliminating cold spots and improving thermal response consistency.
• Dual-layer ceramic rope door gasket rated for continuous operation at 500°C, offering superior sealing integrity, long service life (>5 years under standard use), and resistance to thermal degradation.
• Independent mechanical over-temperature cut-off circuit (optional), compliant with IEC 61000-4-2/4-4 immunity standards, providing fail-safe interruption if primary controller malfunctions.
• Cold-rolled steel exterior with electrostatic epoxy powder coating (film thickness ≥60 µm), corrosion-resistant and compatible with cleanroom Class 8 (ISO 14644-1) facility requirements.
• Two adjustable stainless-steel shelves with reinforced support brackets; shelf positions modifiable without tools via slide-and-lock mechanism.

Sample Compatibility & Compliance

The DHG-9309A accommodates a broad spectrum of sample formats—including metal components, polymer specimens, ceramic green bodies, catalyst pellets, and coated substrates—without risk of cross-contamination or residue buildup. Its stainless-steel interior meets ASTM E145-22 Class II oven classification for non-volatile residue testing and complies with USP requirements for dry-heat sterilization validation when operated above 160°C for defined dwell times. All electrical components conform to CE marking directives (2014/30/EU EMC, 2014/35/EU LVD) and RoHS 2011/65/EU material restrictions. Documentation includes factory calibration certificates traceable to NIM (National Institute of Metrology, China) standards, supporting audit readiness for ISO/IEC 17025 accreditation and FDA 21 CFR Part 11–governed electronic records where optional RS485 data logging is deployed.

Software & Data Management

While the base unit operates via standalone microcontroller firmware, optional RS485 serial interface enables integration with third-party SCADA platforms (e.g., LabVIEW, WinCC, Ignition) using Modbus RTU protocol. An optional embedded thermal printer provides hard-copy output of temperature/time logs with timestamp, operator ID field, and cycle signature—satisfying ALCOA+ data integrity criteria for GMP-regulated environments. The intelligent programmable controller (optional add-on) supports up to 30 segmented temperature ramps with slope control, event-triggered alarms, and USB export of CSV-formatted datasets. All firmware versions undergo version-controlled release cycles with documented change logs, aligning with Annex 11 (EU GMP) expectations for configurable software validation.

Applications

• Thermal aging studies per ASTM D573 and ISO 188 for elastomers and rubber compounds.
• Moisture content determination in pharmaceutical excipients (EP 2.2.32, USP <731>) using gravimetric loss-on-drying protocols.
• Sintering pre-heat cycles for powder metallurgy parts prior to furnace entry.
• Curing of high-temperature epoxies, polyimides, and silicone adhesives used in aerospace assemblies.
• Residual solvent removal from battery electrode coatings in lithium-ion cell manufacturing.
• Calibration of thermocouples and RTDs via fixed-point annealing procedures at 420°C (Zn), 660°C (Al), and 962°C (Ag) — though extended operation beyond 500°C requires external modification not covered under warranty.

FAQ

What is the maximum recommended continuous operating temperature?
The DHG-9309A is validated for continuous operation up to 500°C. Prolonged exposure above this limit may accelerate insulation degradation and compromise sensor accuracy.
Does the oven support validation documentation for IQ/OQ/PQ protocols?
Yes—factory-provided as-built drawings, wiring schematics, calibration reports (including thermocouple verification at three points: 100°C, 300°C, and 500°C), and URS traceability matrices are available upon request for qualification projects.
Can the chamber be purged with inert gas?
The standard configuration does not include gas inlet/outlet ports; however, 25 mm and 50 mm test port kits (optional accessories) allow safe integration of nitrogen or argon purge lines with appropriate pressure regulation.
Is remote monitoring possible without the RS485 module?
No—local display only. Ethernet or Wi-Fi connectivity is not natively supported; all digital communication requires the optional RS485 interface paired with compatible host software.
How often should preventive maintenance be performed?
We recommend quarterly inspection of door gaskets, fan motor lubrication (if applicable), and verification of thermal uniformity per ASTM E2207; annual recalibration of the main temperature sensor is advised for regulated applications.