Zuofei DHG-9246A Forced-Air Constant-Temperature Drying Oven

Overview

The Zuofei DHG-9246A is a precision-engineered forced-air constant-temperature drying oven designed for routine and mission-critical thermal processing in industrial laboratories, quality control facilities, and academic research environments. It operates on the principle of convection-based heat transfer, utilizing a high-reliability centrifugal blower and optimized airflow ducting to ensure uniform thermal distribution across the working chamber. The unit is rated for continuous operation up to 300°C, making it suitable for applications requiring elevated temperature stability—including moisture removal, thermal aging, pre-conditioning of polymer samples, sterilization of glassware, and solvent evaporation under controlled conditions. Its robust construction—featuring a mirror-finish stainless steel interior welded via argon arc technology and a cold-rolled steel exterior with powder-coated finish—ensures long-term corrosion resistance and mechanical integrity under repeated thermal cycling.

Key Features

• Microprocessor-based P.I.D. temperature controller with dual-line digital display, offering precise setpoint regulation and real-time deviation monitoring
• Programmable timer with 1–9999 minute range; supports automatic shutdown and power-resume functionality following unexpected interruption
• Over-temperature deviation protection circuit with audible alarm, compliant with IEC 61000-4-2 immunity standards
• High-efficiency axial fan capable of sustained operation at 300°C, integrated into a single-channel forced-convection air path for consistent thermal homogeneity
• High-performance silicone rubber gasket (synthetic fluorosilicone formulation), rated for continuous use up to 350°C, ensuring low-leakage sealing and extended service life
• Tempered double-glazed observation window with anti-fog coating, enabling non-intrusive visual monitoring without thermal loss or condensation interference
• Standard configuration includes two adjustable stainless steel shelves (load capacity: 15 kg per shelf); up to five shelves may be installed

Sample Compatibility & Compliance

The DHG-9246A accommodates a broad spectrum of sample types—including petri dishes, crucibles, weighing boats, glass vials, metal test coupons, and ceramic substrates—within its 225 L working volume. Its internal geometry (50 × 60 × 75 cm) permits vertical stacking of standard ISO/IEC 17025-compliant calibration reference blocks for spatial temperature mapping validation. The oven meets essential safety and electromagnetic compatibility requirements per GB/T 5170.2–2017 (equivalent to IEC 60068-2-2 Ed. 5.0) for dry heat testing. While not certified to UL or CSA standards out-of-the-box, the unit’s electrical architecture (220 V / 50 Hz, 2600 W) supports third-party certification pathways for GLP/GMP-regulated environments when paired with documented IQ/OQ protocols. Optional independent over-temperature cut-off (settable from 50°C to 320°C) satisfies risk-mitigation requirements under ISO 13485 Clause 7.5.2 and FDA 21 CFR Part 820.72.

Software & Data Management

The base model supports analog data logging via optional RS485 interface (Modbus RTU protocol), enabling integration with SCADA systems or centralized laboratory informatics platforms such as LabVantage or Thermo Fisher SampleManager. An optional thermal printer module provides time-stamped hardcopy output of temperature profiles, meeting ALCOA+ data integrity criteria for audit trails. For advanced process control, the optional touchscreen multi-segment programmer allows definition of up to 32 programmable steps—including ramp rates (0.1–20.0°C/min), soak durations, and hold temperatures—with built-in curve visualization and CSV export capability. All logged data retain full traceability, including operator ID, timestamp, and environmental context—fully compatible with 21 CFR Part 11-compliant electronic signature workflows when deployed with validated software middleware.

Applications

• Moisture content determination per ASTM D2298 and ISO 712 for food, pharmaceutical excipients, and agricultural commodities
• Pre-drying of filter papers and gravimetric analysis vessels prior to ashing or residue quantification (USP & EP general chapter <1251>)
• Thermal stabilization of reference materials used in calorimetry and TGA calibration
• Baking of coated substrates in thin-film R&D and printed electronics fabrication
• Accelerated aging studies per ASTM D3045 for polymer degradation kinetics
• Depyrogenation of glassware and stainless-steel components in cleanroom-support labs

FAQ

What is the maximum permissible load weight inside the chamber?
The DHG-9246A supports a total static load of up to 45 kg distributed across five shelves; individual shelf rating is 15 kg.
Does the oven support NIST-traceable temperature calibration?
Yes—three calibrated PT100 probe ports (top, center, bottom) are provided for simultaneous multi-point validation using external reference thermometers traceable to NIST SRM 1750.
Can the unit be operated continuously at 300°C?
Yes, the heating elements, insulation, and fan motor are rated for uninterrupted operation at 300°C per manufacturer specifications and IEC 60519-2 Annex B thermal endurance guidelines.
Is the RS485 interface compatible with LabVIEW and MATLAB?
Yes—standard Modbus RTU implementation enables native driver support in both LabVIEW (NI Modbus Library) and MATLAB (Instrument Control Toolbox).
How often should the door seal be replaced under routine use?
Under typical operation (2–4 cycles/day at ≤250°C), the fluorosilicone gasket maintains functional integrity for ≥24 months; visual inspection every 6 months is recommended per preventive maintenance schedule.