Yoyi DHG-9620A Vertical Forced-Air Constant-Temperature Drying Oven

Overview

The Yoyi DHG-9620A is a vertically oriented, forced-air circulating drying oven engineered for precision thermal processing in industrial and laboratory environments. It operates on the principle of convection-driven heat transfer, utilizing an optimized rear-mounted air duct system with adjustable intake and exhaust ports to ensure uniform airflow distribution across the entire chamber volume. This architecture enables consistent thermal profiles essential for drying, baking, sterilization, polymer curing, moisture removal, and pre-conditioning of samples prior to analytical testing. Designed in strict accordance with GB/T 30435–2013 (General Technical Requirements for Electrically Heated Drying Ovens), the DHG-9620A meets foundational performance criteria for temperature stability, uniformity, and safety—making it suitable for use in GLP-compliant laboratories, quality control departments, and production support facilities where traceable, repeatable thermal treatment is required.

Key Features

• Microprocessor-based intelligent temperature controller with PID algorithm, enabling precise setpoint regulation and real-time monitoring of chamber temperature
• Large-format LCD menu interface displaying simultaneously: set temperature, actual chamber temperature, elapsed time, and remaining hold duration
• Programmable timer with 1–9999 minute range; automatic shutdown upon completion or thermal fault detection
• Dual-layer tempered glass observation window with wide viewing angle, facilitating non-intrusive visual monitoring without compromising thermal integrity
• High-efficiency forced-air circulation system featuring rear-mounted blower and symmetrical duct layout, delivering improved temperature uniformity (±2.5% at 100°C)
• Robust construction: cold-rolled steel exterior with electrostatic epoxy-polyester coating; interior chamber fabricated from mirror-finish 304 stainless steel for corrosion resistance and ease of cleaning
• High-temperature silicone door gasket ensures long-term sealing performance and minimizes heat loss during extended operation cycles
• Independent over-temperature protection circuit (optional) interrupts heating if preset limit is exceeded—critical for unattended operation and sample integrity assurance
• Standard rear-mounted ventilation ports enable passive moisture evacuation; eliminates need for manual vent adjustment during humidification-sensitive processes

Sample Compatibility & Compliance

The DHG-9620A accommodates diverse sample types—including glassware, metal components, polymer sheets, biological substrates, pharmaceutical excipients, and electronic assemblies—within its 620 L working volume. Its stainless-steel chamber supports routine cleaning protocols and resists degradation from repeated exposure to organic solvents or aqueous residues. While not certified to ISO/IEC 17025 or FDA 21 CFR Part 11 out-of-the-box, the unit provides foundational hardware compatibility for integration into auditable workflows: optional RS485 serial interface enables connection to validated data acquisition systems, and embedded printer output supports hard-copy record generation for batch documentation. The oven’s design aligns with widely referenced thermal validation practices per ASTM E2251 (Standard Practice for Calibration of Thermometers) and supports IQ/OQ execution when deployed under controlled environmental conditions (ambient 5–40°C, <80% RH).

Software & Data Management

The DHG-9620A includes no proprietary software suite but offers standardized digital interfaces for third-party integration. The optional RS485 port supports Modbus RTU protocol, permitting bidirectional communication with SCADA platforms, LIMS, or custom Python- or LabVIEW-based logging applications. Optional embedded thermal printer outputs timestamped temperature logs compliant with ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate). For advanced process control, the multi-segment programmable temperature controller (optional add-on) allows up to 30 step sequences with ramp/soak profiles—enabling complex thermal protocols such as gradient drying or staged polymer annealing. All configuration parameters—including setpoints, timers, and alarm thresholds—are retained in non-volatile memory, ensuring recovery after power interruption without manual reconfiguration.

Applications

• Drying of moisture-sensitive materials in food safety labs and agricultural research institutes
• Baking and curing of coatings, adhesives, and composite laminates in R&D and pilot-scale manufacturing
• Thermal sterilization of reusable labware in microbiology and cell culture facilities
• Pre-drying of filter membranes and chromatography media prior to gravimetric analysis
• Conditioning of electrical insulation materials and PCB assemblies before dielectric testing
• Accelerated aging studies of elastomers, plastics, and packaging films per ASTM D573 and ISO 188
• Residual solvent removal from synthesized APIs and intermediates in pharmaceutical development

FAQ

What is the maximum operating temperature of the DHG-9620A?
The DHG-9620A is rated for continuous operation from ambient +10°C up to 250°C.

Is the temperature uniformity verified per ISO 17025 standards?
While the unit complies with GB/T 30435–2013, formal ISO/IEC 17025 accreditation requires on-site validation using calibrated reference thermocouples and documented uncertainty budgets—typically performed by end-user QA teams or external calibration providers.

Can the oven be used for inert-atmosphere processing?
Yes—via the optional inert gas inlet kit (including needle valve and rotameter), users can introduce nitrogen or argon to suppress oxidation during thermal treatment of reactive materials.

Are replacement shelves included with purchase?
Four adjustable stainless-steel shelves are supplied standard; additional trays may be ordered separately with matching load-rating specifications.

Does the unit support remote monitoring via Ethernet or Wi-Fi?
No native Ethernet or wireless connectivity is provided; however, RS485-to-Ethernet gateways can be deployed externally to extend network capability within existing infrastructure.