Zuofei DHG-9626A Forced-Air Constant-Temperature Drying Oven

Overview

The Zuofei DHG-9626A is a high-capacity, forced-air constant-temperature drying oven engineered for precision thermal processing in industrial laboratories, quality control facilities, and research institutions. It operates on the principle of convection-driven heat transfer—using a rear-mounted, high-reliability stainless steel heating system coupled with a continuously rated high-temperature centrifugal blower—to ensure stable, uniform thermal distribution across its large internal chamber (80 × 60 × 130 cm). Designed for applications requiring sustained operation up to 300°C—including drying of moisture-sensitive samples, thermal stabilization of polymers, pre-conditioning of test specimens, sterilization of glassware, and controlled curing of coatings—the DHG-9626A meets foundational requirements for ISO/IEC 17025-compliant environments where repeatability and traceable temperature control are essential.

Key Features

• Microprocessor-based PID temperature controller with dual-line digital display, offering real-time setpoint and actual temperature readout with 0.1°C resolution and ±1.0°C stability under steady-state conditions.
• Rear-mounted heating configuration with three independent heating zones and dedicated airflow channels—optimized to minimize thermal stratification and improve axial/radial uniformity (±3% at 100°C, verified per ASTM E2207).
• Mirror-finish 304 stainless steel inner chamber—electropolished and fully welded via argon arc process—ensuring corrosion resistance, ease of decontamination, and long-term dimensional stability under repeated thermal cycling.
• Robust structural design: cold-rolled steel outer casing with powder-coated finish; integrated transparent double-glazed observation window with silicone-sealed gasket rated for continuous service at 300°C.
• Intelligent safety architecture including over-temperature deviation protection, auto-restart after power interruption, audible alarm activation upon thermal excursion, and configurable independent upper-limit cut-off circuit (optional).
• Standard 3-tier adjustable stainless steel shelving (expandable to 6 levels); all trays feature reinforced edge profiles and non-slip support rails for secure placement of heavy or stacked sample containers.

Sample Compatibility & Compliance

The DHG-9626A accommodates a broad range of sample formats—from standard Petri dishes, weighing boats, and aluminum pans to larger industrial components (e.g., printed circuit boards, composite laminates, ceramic substrates) up to 75 cm in length. Its chamber geometry supports both static and dynamic loading configurations without impeding airflow integrity. The unit complies with general electrical safety standards IEC 61010-1 and GB 4793.1 (Chinese national equivalent), and its thermal performance characteristics align with calibration practices outlined in ISO 17025 Clause 6.4.2 for equipment used in accredited testing. While not inherently 21 CFR Part 11–compliant, optional RS485 communication modules enable integration into validated systems supporting electronic audit trails when paired with compliant LIMS or SCADA platforms.

Software & Data Management

The base configuration includes an embedded timer with programmable duration (1–9999 min) and automatic shutdown. Optional upgrades expand data handling capabilities: an RS485 interface allows bidirectional communication with external PCs running custom or third-party logging software (e.g., LabVIEW, MATLAB, or industry-standard MES platforms); a thermal printer module provides hard-copy output of time-stamped temperature logs; and a touchscreen multi-segment programmer enables up to 32-step ramp-soak-hold profiles—including programmable ramp rates, dwell times, and scheduled start/stop events—with built-in curve visualization and CSV export functionality. All optional digital modules retain full GLP/GMP traceability when deployed within documented procedures.

Applications

• Drying and moisture removal from pharmaceutical excipients, herbal extracts, and soil samples prior to gravimetric analysis (in accordance with USP & EP drying protocols).
• Baking and pre-baking of electrode coatings, battery slurry films, and thin-film sensor substrates under controlled thermal ramping.
• Thermal aging studies of elastomers, adhesives, and packaging materials per ASTM D573 and ISO 188.
• Sterilization of reusable labware (glass, metal) using dry-heat cycles validated at ≥160°C for ≥2 hours.
• Post-curing of epoxy composites and prepreg layups in R&D and low-volume production settings.
• Conditioning of reference standards and calibration artifacts prior to metrological evaluation.

FAQ

What is the maximum operating temperature and how is it maintained?
The DHG-9626A is rated for continuous operation up to 300°C. Temperature is regulated by a digital PID controller interfaced with a Class A PT100 sensor mounted inside the chamber; the rear-mounted triple-zone heater array responds dynamically to minimize overshoot and maintain ±1.0°C fluctuation under load.
Does the oven support validation and calibration documentation?
Yes—the unit’s stable thermal profile, accessible sensor port, and optional data-logging interfaces facilitate IQ/OQ execution. Users may perform temperature mapping per ISO 14644-3 or EU GMP Annex 15 guidelines using external calibrated probes.
Can the DHG-9626A be integrated into a networked lab infrastructure?
With the optional RS485 module and compatible protocol drivers, the oven can transmit real-time temperature values and status flags to centralized monitoring systems, supporting remote supervision and automated report generation.
Is the inner chamber suitable for corrosive or solvent-laden atmospheres?
The mirror-finish 304 stainless steel construction resists mild organic vapors and aqueous residues; however, prolonged exposure to halogenated solvents or strong acids is not recommended without additional ventilation or inert gas purging.
What maintenance intervals are recommended for optimal performance?
Blower motor bearings should be inspected annually; door gaskets require visual assessment every six months and replacement if compression set exceeds 2 mm; calibration verification is advised before critical batches or at least quarterly per internal SOPs.