Yoyi DHG-9245C Nitrogen-Purged Forced-Air Drying Oven (220 L, 300 °C)
| Brand | Yoyi |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Instrument Category | Domestic |
| Model | DHG-9245C |
| Instrument Type | Precision Drying Oven |
| Temperature Fluctuation | ±1 °C |
| External Dimensions | 880 × 800 × 830 mm |
| Temperature Control Range | RT+10 to 300 °C |
| Internal Chamber Dimensions | 600 × 595 × 650 mm |
| Temperature Resolution | 0.1 °C |
| Chamber Material | Mirror-Finish Stainless Steel |
| Heating Method | Electric Resistive Heating |
| Temperature Uniformity | ±2.5% (measured at 100 °C, non-purged condition) |
| Inert Gas Inlet | Φ10 mm |
| Gas Flow Rate | 0–10 L/min (with calibrated rotameter) |
Overview
The Yoyi DHG-9245C is a precision-engineered nitrogen-purged forced-air drying oven designed for applications requiring oxygen-sensitive thermal processing in laboratory and industrial R&D environments. Unlike standard convection ovens, the DHG-9245C integrates a dedicated inert gas inlet system with calibrated flow control, enabling continuous displacement of ambient air with high-purity nitrogen (or other inert gases such as argon) to suppress oxidation, moisture ingress, and volatile organic compound accumulation within the chamber. Its thermally optimized wind tunnel architecture—featuring rear-mounted circulation fans, strategically positioned baffle plates, and dual-directional airflow distribution—ensures uniform heat transfer across the full 220 L working volume. The oven operates over a wide temperature range from ambient +10 °C to 300 °C, with microprocessor-based PID control delivering stable thermal regulation under dynamic load conditions. This design supports critical workflows including thermal stabilization of hygroscopic compounds, low-oxygen annealing of thin-film substrates, pre-conditioning of calibration standards, and accelerated aging studies compliant with ASTM D5422 and ISO 11357-3 protocols.
Key Features
- Microcomputer-controlled 4.3-inch LCD interface with intuitive menu navigation, supporting simultaneous display of setpoint temperature, real-time chamber temperature, elapsed time, and remaining hold duration
- Intelligent power-loss recovery function: automatically restores previously configured parameters—including temperature setpoint, timer value, and PID tuning—after unexpected shutdown or mains interruption
- Dual-layer tempered glass observation window with reinforced silicone gasket seal, enabling non-intrusive visual monitoring without thermal leakage or condensation interference
- High-efficiency forced-air circulation system with rear-mounted centrifugal blower and asymmetric duct geometry, achieving ≥92% volumetric air exchange per minute at 150 °C
- Electropolished 304 stainless steel interior chamber (mirror finish) with removable, height-adjustable stainless steel shelves (2 standard trays included)
- Front-access inert gas port (Φ10 mm) integrated with precision-calibrated rotameter (0–10 L/min range), supporting rapid connection to external nitrogen supply lines and real-time flow adjustment
- Auto-evacuation exhaust duct with passive condensate drainage path, eliminating manual venting requirements during high-humidity drying cycles
- Cold-rolled steel outer casing with epoxy-polyester powder coating for corrosion resistance and mechanical durability under continuous operation
Sample Compatibility & Compliance
The DHG-9245C accommodates a broad spectrum of sample formats—including Petri dishes, crucibles, glassware, polymer films, PCB assemblies, and ceramic sintering boats—within its 600 × 595 × 650 mm stainless steel chamber. Its inert atmosphere capability makes it suitable for processing oxygen-labile materials such as lithium-ion battery cathode precursors, organometallic catalysts, reduced graphene oxide dispersions, and pharmaceutical intermediates prone to autoxidation. The unit complies with IEC 61010-1:2010 safety standards for laboratory electrical equipment and meets electromagnetic compatibility requirements per EN 61326-1. Optional RS485 communication module enables integration into centralized lab management systems adhering to FDA 21 CFR Part 11 data integrity guidelines when paired with validated software. Temperature validation reports (per IQ/OQ protocols) can be generated using optional PT100 probe ports (25 mm or 50 mm test openings available as accessories).
Software & Data Management
While the base configuration features standalone microcontroller operation, optional digital enhancements extend traceability and process control capabilities. The RS485 interface (available as an add-on) supports Modbus RTU protocol for bidirectional communication with SCADA platforms or LIMS. When combined with Yoyi’s optional multi-segment programmable controller (up to 30 ramp/soak steps), users can define complex thermal profiles for applications such as solvent removal kinetics studies or controlled dehydration of biologics. An embedded thermal printer accessory provides hard-copy logs of temperature/time data with timestamped entries—essential for GLP-compliant documentation. All parameter changes, alarm events, and runtime statistics are logged internally with audit-trail functionality, ensuring alignment with ISO/IEC 17025 clause 7.7 requirements for equipment recordkeeping.
Applications
- Drying and conditioning of moisture-sensitive reference standards (e.g., USP USP 1251, ISO 8573-3)
- Oxidation-inhibited thermal curing of conductive pastes and dielectric coatings in electronics manufacturing
- Pre-baking of optical components prior to thin-film deposition to minimize outgassing contaminants
- Controlled dehydration of botanical extracts and nutraceutical powders while preserving thermolabile phytochemicals
- Accelerated stability testing of polymer composites per ASTM D3045 protocols under inert atmosphere
- Post-processing annealing of metal-organic frameworks (MOFs) to retain crystallinity and porosity
- Residual solvent removal from pharmaceutical granules under nitrogen blanket, supporting ICH Q5C guidance
FAQ
What inert gases are compatible with the DHG-9245C?
Nitrogen (N₂) and argon (Ar) are fully supported; helium may be used but requires recalibration of the rotameter due to differing gas density and viscosity.
Can the oven operate continuously at 300 °C?
Yes—the heating elements, insulation, and chamber seals are rated for uninterrupted operation at maximum temperature, with thermal cut-off protection activated only above 320 °C.
Is temperature uniformity verified under nitrogen purge conditions?
Uniformity specifications (±2.5% at 100 °C) are established in non-purged mode per standard test procedures; actual performance under flow-controlled nitrogen varies by gas flow rate and must be qualified per user-defined SOPs.
Does the unit support external data logging via USB or Ethernet?
No native USB/Ethernet port is included; however, the optional RS485 interface enables connection to third-party data acquisition systems via serial-to-Ethernet converters.
What maintenance intervals are recommended for long-term reliability?
Fan motor lubrication and door gasket inspection every 6 months; annual verification of temperature sensor calibration using NIST-traceable reference probes is advised for regulated environments.
