Yoyi DHG-9625A Vertical Large-Capacity Forced-Air Laboratory Drying Oven

Overview

The Yoyi DHG-9625A is a vertically oriented, large-capacity forced-air drying oven engineered for precision thermal processing in demanding laboratory and industrial quality control environments. Utilizing a robust convection-based heating architecture, the unit maintains stable, uniform temperature distribution across its 620 L internal chamber via a rear-mounted centrifugal blower and optimized air duct system. Unlike natural-convection ovens, this model employs active airflow management—directed through calibrated inlet and exhaust ports—to ensure rapid heat recovery, minimal thermal stratification, and consistent moisture removal. Its operational range spans from ambient +10 °C up to 300 °C, making it suitable for applications requiring elevated thermal stability, including polymer curing, pharmaceutical residual solvent removal, ceramic pre-firing, and microbiological media preparation. The oven complies with GB/T 30435–2013, the Chinese national standard for electrically heated drying ovens, which specifies requirements for temperature accuracy, uniformity, safety interlocks, and insulation performance.

Key Features

• Microprocessor-based PID temperature controller with 0.1 °C resolution, real-time display of setpoint, actual chamber temperature, and remaining timer duration on an intuitive LCD menu interface
• Mirror-finish stainless steel (SUS304) interior chamber and adjustable stainless steel shelving—resistant to corrosion, easy to clean, and compatible with repeated sterilization cycles
• Dual-layer tempered glass observation window with silicone-sealed frame, enabling non-intrusive visual monitoring without thermal leakage or condensation interference
• High-efficiency forced-air circulation system featuring a rear-mounted centrifugal fan, directional air ducts, and automatic intake/exhaust dampers for dynamic humidity management
• Independent over-temperature cut-off circuit (optional) that interrupts power when preset safety limit is exceeded—certified to IEC 61000-4-2/4-3 EMC immunity standards
• Robust cold-rolled steel exterior with electrostatic epoxy-polyester powder coating, ensuring mechanical durability and chemical resistance in multi-user lab settings
• Configurable auxiliary interfaces including RS485 communication port (Modbus RTU protocol), analog 4–20 mA output, and optional thermal printer for audit-ready record generation

Sample Compatibility & Compliance

The DHG-9625A accommodates a broad spectrum of sample types—from Petri dishes and aluminum weighing pans to stacked trays of electronic components or ceramic green bodies—without compromising thermal homogeneity. Its chamber geometry supports standardized ISO/IEC 17025-compliant validation protocols, including mapping studies per ASTM E2297 (Standard Guide for Validation of Thermal Processing Equipment). The unit meets essential safety and electromagnetic compatibility requirements outlined in GB 4793.1–2019 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use) and conforms to Class B emission limits under GB 9254–2008. While not inherently FDA 21 CFR Part 11 compliant, the optional RS485 interface enables integration with validated LIMS or ELN platforms supporting electronic signature and audit trail functionality required under GLP/GMP frameworks.

Software & Data Management

When equipped with the optional RS485 module and配套 software, the DHG-9625A supports bidirectional data exchange for remote parameter setting, real-time logging, and historical trend analysis. Logged parameters include chamber temperature (every 1–60 seconds, user-selectable), elapsed time, alarm status, and heater duty cycle. Data export is supported in CSV format for traceability and statistical process control (SPC) analysis. Optional embedded thermal printers generate time-stamped hard copies of temperature profiles—critical for batch release documentation in regulated environments such as pharmaceutical QC labs. All configuration changes are timestamped and stored in non-volatile memory, preserving integrity during unexpected power loss or system reset.

Applications

• Drying of moisture-sensitive powders and granules in food and pharmaceutical R&D
• Pre-conditioning of polymeric films and composites prior to tensile or DMA testing
• Baking of printed circuit board (PCB) substrates and solder paste reflow simulation
• Heat treatment of calibration standards and reference materials per ISO/IEC 17025 clause 6.4.10
• Residual solvent evaporation from HPLC vials and GC sample preparation vessels
• Thermal stabilization of optical components and sensor housings in aerospace QA workflows
• Accelerated aging studies of elastomers and adhesives under controlled thermal stress

FAQ

What is the maximum operating temperature and how is thermal stability maintained?
The DHG-9625A achieves a maximum setpoint of 300 °C. Stability is ensured by a dual-sensor PID algorithm, high-density mineral wool insulation (≥100 mm thickness), and adaptive heater modulation that minimizes overshoot during ramp phases.

Can this oven be validated for GxP-regulated processes?
Yes—when configured with RS485 and appropriate software, it supports IQ/OQ documentation, temperature mapping per Annex 15, and electronic record retention aligned with ALCOA+ principles.

Is inert atmosphere operation supported?
An optional inert gas inlet port (with integrated rotameter and quick-connect fitting) allows continuous nitrogen or argon purging to suppress oxidation during thermal processing of reactive materials.

How many shelves are included and are they load-rated?
Four adjustable stainless steel shelves are supplied, each rated for 15 kg uniformly distributed load at 300 °C. Shelf spacing is configurable in 25 mm increments.

What maintenance is required to sustain long-term accuracy?
Annual verification using NIST-traceable thermocouples is recommended. Routine cleaning of the air filter and inspection of door gasket integrity should occur every 3 months in high-use environments.