Shanghai Youyi DHG-9039A High-Temperature Drying Oven (500 °C)

Overview

The Shanghai Youyi DHG-9039A is a precision-engineered high-temperature drying oven designed for laboratory and industrial thermal processing applications requiring stable, uniform heating up to 500 °C. Built upon a robust constant-temperature architecture, it employs resistive electric heating combined with forced-air convection to achieve rapid thermal equilibration and exceptional spatial temperature uniformity across its 30 L stainless-steel chamber. Its operational principle centers on closed-loop PID temperature regulation—where real-time sensor feedback (Pt100 class A) continuously adjusts heater duty cycle to maintain setpoint accuracy within ±2 °C and resolution of ±1 °C. The oven is optimized for processes including thermal curing of coatings and adhesives, ashing of organic samples, pre-drying of refractory materials, stress-relief annealing of small metallic components, and accelerated aging tests per ASTM E145 or ISO 22196 protocols. Its compact footprint (670×480×700 mm) makes it suitable for benchtop integration in QC labs, R&D facilities, and university teaching laboratories where space efficiency and thermal reliability are critical.

Key Features

• Microprocessor-based PID temperature controller with 4.3″ full-color TFT LCD display—showing real-time chamber temperature, setpoint, elapsed time, and remaining hold duration
• Intelligent auto-tuning function that dynamically optimizes control parameters for varying load conditions and ambient fluctuations
• Pre-heating air chamber design: incoming ambient air is pre-warmed and homogenized before entering the working zone, minimizing thermal gradients during ramp-up
• Forced convection system using a multi-blade centrifugal fan with adjustable airflow direction—ensuring ±2.5% temperature uniformity (measured at 100 °C per IEC 60068-3-5)
• Double-layer ceramic rope door gasket rated for continuous operation at 500 °C—providing long-term sealing integrity and resistance to thermal degradation
• High-efficiency insulation: 100 mm thick glass fiber blanket between inner chamber and outer shell—reducing surface temperature rise and energy consumption
• Structural durability: cold-rolled steel exterior with electrostatic epoxy powder coating; interior chamber and shelves fabricated from mirror-finish SUS304 stainless steel
• Enhanced safety architecture: standard over-temperature cut-off circuit with independent mechanical thermostat; optional independent limit controller (model SHYY-LTC-1) adds redundant protection per IEC 61000-4-2

Sample Compatibility & Compliance

The DHG-9039A accommodates a wide range of sample types—including crucibles, petri dishes, metal coupons, polymer sheets, ceramic substrates, and glassware—within its 300×300×350 mm chamber. Removable, height-adjustable stainless-steel shelves (2 included) support flexible loading configurations. The oven complies with general-purpose laboratory equipment safety standards including GB/T 14710 (Chinese national standard for environmental adaptability) and meets electromagnetic compatibility requirements per GB/T 18268.31. While not certified to UL/CSA or CE for standalone medical device use, its design principles align with GLP-compliant thermal validation practices: traceable temperature sensors, documented calibration intervals, and audit-ready operational logs when equipped with RS485 interface and compliant data acquisition software.

Software & Data Management

The DHG-9039A supports digital integration via optional RS485 serial interface (Modbus RTU protocol), enabling bidirectional communication with LIMS or SCADA systems for centralized monitoring and alarm logging. When paired with the supplied Windows-compatible software (v3.2), users can configure multi-step temperature profiles, export timestamped CSV datasets (temperature vs. time), and generate PDF reports compliant with 21 CFR Part 11 requirements—including electronic signatures, audit trails, and user-access controls. Optional embedded thermal printer (SHYY-TP-200) provides hard-copy verification of process start/end times, peak temperatures, and deviation alerts—critical for ISO 17025-accredited testing laboratories maintaining documented evidence of thermal exposure history.

Applications

• Thermal curing of epoxy resins, silicone encapsulants, and powder coatings in electronics manufacturing
• Gravimetric moisture analysis of geological samples and pharmaceutical excipients (per USP & Ph. Eur. methods)
• Ash content determination in foodstuffs, soils, and biomass per AOAC 923.03 and ASTM D3174
• Heat treatment of small tooling inserts and calibration standards prior to metrological use
• Accelerated thermal aging of elastomers and composites under controlled oxidative conditions (ASTM D573)
• Drying of high-purity ceramics and sintering preforms prior to furnace processing
• Stabilization of reference materials used in thermogravimetric calibration workflows

FAQ

What is the maximum continuous operating temperature of the DHG-9039A?
The chamber is rated for continuous operation at 500 °C, verified by thermal mapping per IEC 60068-3-5 at multiple load conditions.
Does the oven support programmable ramp-and-soak cycles?
Yes—when equipped with the optional intelligent program controller (SHYY-PC-200), it executes up to 30 segments with variable ramp rates and dwell times.
Can the temperature data be exported for regulatory compliance reporting?
Yes—via RS485 + software or embedded printer, supporting CSV export, PDF report generation, and 21 CFR Part 11–compliant audit trails.
Is the inner chamber resistant to acidic vapors generated during ashing?
The SUS304 stainless-steel chamber offers good resistance to mild acidic fumes; for aggressive halogenated ashing, optional quartz-lined chamber inserts are available upon request.
What maintenance is required to ensure long-term temperature accuracy?
Annual calibration of the Pt100 sensor against NIST-traceable reference standards is recommended; fan motor lubrication and gasket inspection should be performed every 6 months under continuous 400+°C operation.