Zuofei DHG-9053A Benchtop Forced-Air Drying Oven
| Brand | Zuofei |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Product Category | Domestic |
| Model | DHG-9053A |
| Instrument Type | High-Temperature Drying Oven |
| Temperature Range | RT+10°C to 250°C |
| Temperature Uniformity | ±1.0°C |
| External Dimensions (W×D×H) | 68×59×52 cm |
| Internal Chamber Dimensions (W×D×H) | 42×35×35 cm |
| Temperature Resolution | 0.1°C |
| Operating Ambient Temperature | +5°C to +40°C |
| Interior Material | Mirror-Finish Stainless Steel |
Overview
The Zuofei DHG-9053A is a benchtop forced-air drying oven engineered for precise thermal processing in research laboratories, quality control environments, and industrial R&D settings. It operates on the principle of dry-heat sterilization and moisture removal via convective heat transfer—circulating heated air uniformly throughout the chamber using an internal axial fan and optimized airflow ducting. This design ensures rapid temperature equilibration, high thermal stability, and reproducible drying, baking, curing, and sterilization outcomes. The oven complies with fundamental thermal validation requirements outlined in ISO 17025–accredited laboratory practices and supports routine adherence to ASTM E2500 (Verification of Pharmaceutical Process Equipment) and USP (Sterilization and Sterility Assurance). Its RT+10°C to 250°C operating range enables applications ranging from polymer sample conditioning to microbiological media preparation and residual solvent evaporation.
Key Features
- Microprocessor-based digital temperature controller with LCD display, offering 0.1°C resolution and ±1.0°C temperature uniformity across the working chamber.
- Forced-air convection system with adjustable fan speed—enabling optimization of airflow intensity for sensitive samples or high-mass loads.
- Dual independent overtemperature protection circuits: primary electronic cut-off and secondary mechanical thermostat—both independently interrupt power supply upon exceeding user-defined safety thresholds.
- Mirror-finish stainless steel interior (304 grade) for corrosion resistance, ease of decontamination, and long-term dimensional stability under repeated thermal cycling.
- Removable and repositionable stainless steel shelving (standard configuration: 2 trays), facilitating flexible load arrangement and simplified chamber cleaning.
- Integrated earth-leakage circuit breaker (ELCB) for personnel and equipment electrical safety in compliance with IEC 61000-4-5 surge immunity standards.
- Optional auxiliary temperature controller available for redundant thermal monitoring—critical for GLP/GMP-regulated workflows requiring fail-safe temperature oversight.
Sample Compatibility & Compliance
The DHG-9053A accommodates standard laboratory glassware (e.g., Petri dishes, weighing bottles, crucibles), metal sample holders, and polymer substrates up to 42 cm wide × 35 cm deep × 35 cm high. Its chamber geometry and airflow profile are validated for homogeneous thermal distribution per ISO 13485 Annex C (sterilization process validation) and align with common validation protocols for dry-heat depyrogenation (e.g., 250°C for ≥45 min). The unit meets CE marking requirements for electromagnetic compatibility (EMC Directive 2014/30/EU) and low-voltage safety (LVD Directive 2014/35/EU). While not certified for Class II biological safety, it is routinely deployed in non-sterile preparatory stages preceding aseptic processing.
Software & Data Management
The base configuration includes local parameter programming via front-panel keypad and real-time display of setpoint, actual temperature, and elapsed time. Optional RS-485 serial interface enables integration into centralized lab monitoring systems using Modbus RTU protocol—supporting remote logging, alarm triggering, and audit-trail generation. When paired with compliant SCADA or LIMS software, the oven satisfies FDA 21 CFR Part 11 requirements for electronic records and signatures, including time-stamped event logs, user-access controls, and change history tracking. SMS alert modules (optional) provide asynchronous notification of out-of-spec conditions—enhancing unattended operation reliability.
Applications
- Drying of moisture-sensitive powders, granules, and filter papers in pharmaceutical and chemical QC labs.
- Baking of ceramic and metallurgical specimens prior to XRD or SEM analysis.
- Curing of epoxy-coated substrates and printed circuit board assemblies.
- Depyrogenation of glass vials and stainless steel tools in pre-sterilization workflows.
- Accelerated aging studies of packaging materials under controlled thermal stress.
- Residual solvent removal from synthesized organic compounds per ICH Q5C guidelines.
FAQ
What is the maximum recommended continuous operating temperature?
The DHG-9053A is rated for continuous operation at up to 250°C; prolonged use above this limit may compromise sensor longevity and chamber seal integrity.
Does the oven support calibration traceability?
Yes—the built-in PT100 sensor can be verified against NIST-traceable reference thermometers; calibration certificates are available upon request with documented uncertainty budgets.
Can the unit be validated for GMP environments?
While the base model is not pre-validated, its architecture supports IQ/OQ/PQ execution per ASTM E2500 and EU Annex 15; documentation packages and validation support services are provided by authorized distributors.
Is external ventilation required during operation?
No dedicated exhaust ducting is mandatory, but installation in a well-ventilated room is advised—especially when processing volatile solvents or generating particulate residues.
What maintenance intervals are recommended?
Fan motor lubrication and door gasket inspection should occur every 6 months; temperature uniformity verification is recommended quarterly or after any major relocation or repair.
