Yoyilab DHG-9625A Vertical Forced-Air Drying Oven, 300 °C, 620 L Capacity

Overview

The Yoyilab DHG-9625A is a vertically oriented, forced-convection drying oven engineered for precision thermal processing in regulated laboratory and industrial R&D environments. It operates on the principle of horizontal air circulation via a rear-mounted centrifugal blower and optimized wind-channel architecture—ensuring uniform heat distribution across the entire 620 L working chamber. Designed to meet the structural and performance requirements of GB/T 30435–2013 (General Technical Requirements for Electrically Heated Drying Ovens), this model supports critical non-destructive thermal operations including moisture removal, pre-conditioning of polymeric substrates, solvent evaporation, sterilization validation, and thermal stability testing of pharmaceutical excipients and electronic components. Its maximum operating temperature of 300 °C enables applications such as ash content determination (per ASTM D3174), vulcanization studies, and desiccation of high-melting-point reference standards—without compromising long-term thermal stability or repeatability.

Key Features

• Microprocessor-based PID temperature controller with real-time digital display, adjustable setpoint resolution of 0.1 °C, and programmable timer (1–9999 minutes)
• Intelligent power-loss recovery function: automatically resumes prior operational parameters—including set temperature, elapsed time, and remaining hold duration—after unexpected interruption
• Double-layer tempered glass observation window with wide-angle viewing field, enabling continuous visual monitoring without thermal leakage or door opening
• Rear-mounted automatic intake/exhaust ports integrated into the forced-air circuit, facilitating passive moisture evacuation during extended drying cycles—eliminating manual vent adjustment
• High-efficiency convection system featuring asymmetric baffle design and rear-mounted axial blower, achieving ≤±2.5% temperature uniformity (measured at 100 °C, empty chamber per GB/T 30435)
• Robust construction: cold-rolled steel exterior with epoxy-polyester electrostatic coating; interior chamber and adjustable shelves fabricated from electropolished SUS304 stainless steel for corrosion resistance and cleanability
• High-integrity sealing: dual-lip silicone gasket rated for continuous service up to 350 °C, ensuring low leakage rate and extended service life under cyclic thermal stress

Sample Compatibility & Compliance

The DHG-9625A accommodates diverse sample formats—including Petri dishes, weighing boats, crucibles, glassware stacks, PCB assemblies, and bulk powder trays—thanks to its vertical footprint and freely adjustable stainless-steel shelving (4 standard trays included). All internal surfaces are non-reactive and autoclavable-compatible for GLP-aligned cleaning validation. The unit complies with GB/T 30435–2013 for safety, metrological performance, and electromagnetic compatibility. Optional accessories—including independent overtemperature cut-off (IEC 61000-4-2 compliant), RS485 Modbus RTU interface (for integration into LIMS or SCADA), and inert gas purging kit with calibrated rotameter (N₂/Ar compatible)—enable alignment with ISO/IEC 17025 calibration workflows and FDA 21 CFR Part 11–governed data integrity requirements when paired with validated software.

Software & Data Management

While the base configuration features standalone microcontroller operation, optional RS485 communication enables bidirectional data exchange with external PCs or PLCs using standard Modbus RTU protocol. When combined with Yoyilab’s certified data logging software (sold separately), users gain audit-trail-capable recordkeeping—including timestamped temperature profiles, alarm event logs, and user authentication metadata—supporting 21 CFR Part 11 Subpart B compliance for electronic records. The embedded LCD interface maintains full local control autonomy even during network downtime, preserving operational continuity in GMP-grade facilities.

Applications

• Moisture content analysis in foodstuffs, grains, and agricultural commodities (AOAC 950.46, ISO 665)
• Thermal aging of elastomers and composites per ASTM D573 and ISO 188
• Drying and conditioning of filter media, catalyst supports, and ceramic precursors prior to BET surface area analysis
• Pre-baking of PCBs and semiconductor packaging substrates to eliminate residual humidity before solder reflow
• Stabilization of hygroscopic reference materials (e.g., potassium hydrogen phthalate, sodium chloride) in metrology labs
• Residue-on-ignition (ROI) testing for inorganic impurities in APIs (USP )

FAQ

What is the maximum allowable load mass for stable temperature uniformity?
For guaranteed ±2.5% uniformity across the chamber, total loaded mass should not exceed 40 kg. Exceeding this may require empirical recalibration per ISO 17025 Clause 5.10.
Can the DHG-9625A be validated for IQ/OQ/PQ protocols?
Yes—its mechanical design, sensor layout (dual PT100 probes: control + safety), and optional data logging package support full qualification against ISO/IEC 17025 and GAMP5 guidelines.
Is the inert gas interface compatible with oxygen analyzers for anaerobic processing?
The standard N₂/Ar inlet includes a 0–10 L/min calibrated rotameter and 6 mm BSP fitting; integration with inline O₂ sensors (e.g., METTLER TOLEDO InPro 6800) requires third-party manifold adaptation.
Does the unit include factory calibration documentation?
Each unit ships with a traceable calibration certificate (NIST-traceable PT100 sensors), test report per GB/T 30435–2013, and material compliance declarations (RoHS, REACH).