Zhonghuan Furnace ZH-DH300 Large-Scale High-Temperature Forced-Air Drying Oven

Overview

The Zhonghuan Furnace ZH-DH300 is a large-capacity, high-temperature forced-air drying oven engineered for industrial laboratories, materials testing facilities, and quality control departments requiring reliable thermal processing across extended operational cycles. It operates on the principle of convection-based heat transfer, utilizing a robust axial fan system to circulate heated air uniformly throughout the insulated chamber. This forced-air architecture ensures rapid temperature ramp rates, minimal thermal gradients (< ±1°C at setpoint), and high reproducibility—critical parameters for applications such as moisture loss quantification, polymer curing validation, pre-conditioning of composite substrates, and thermal stabilization of ceramic precursors. With a maximum operating temperature of 300°C and a volumetric capacity exceeding 1.2 m³, the ZH-DH300 bridges the performance gap between standard benchtop ovens and custom industrial furnaces, delivering laboratory-grade precision in a scalable, floor-standing configuration.

Key Features

• High-stability temperature control system featuring PID algorithm with digital setpoint adjustment and real-time deviation monitoring
• Double-walled insulated chamber with mineral wool insulation (≥100 mm thickness) and seamless stainless steel (AISI 304) inner lining for corrosion resistance and long-term dimensional stability
• Front-mounted dual-layer tempered glass door with integrated observation window—maintains structural integrity and thermal safety at elevated temperatures while enabling non-intrusive process monitoring
• Heavy-duty axial circulation fan with adjustable speed control, positioned to optimize laminar airflow patterns and minimize dead zones within the 1.2 m³ working volume
• Independent over-temperature protection circuit with mechanical cut-off switch (certified to IEC 61000-4-2), providing fail-safe shutdown independent of the main controller
• Electrical supply compatibility with standard industrial three-phase 380 VAC / 50 Hz configurations; optional 208/240 VAC single-phase variants available upon request

Sample Compatibility & Compliance

The ZH-DH300 accommodates large-format samples including metal test coupons (ASTM E8/E23), pharmaceutical blister packs (per USP ), battery electrode sheets, printed circuit board assemblies, and bulk powder batches up to 50 kg. Its stainless steel chamber complies with ISO 17025 requirements for equipment qualification, supporting IQ/OQ protocols under GLP and GMP environments. The oven’s temperature uniformity profile meets ASTM E145 Class II specifications for gravity and forced-air ovens used in calibration and thermal validation studies. All electrical components conform to CE marking directives (2014/30/EU EMC and 2014/35/EU LVD), and thermal insulation materials are halogen-free and RoHS-compliant.

Software & Data Management

While the base model includes analog/digital hybrid control with local display, optional integration with Zhonghuan’s ZH-Link™ data acquisition module enables continuous logging of chamber temperature, fan speed, and elapsed time via RS485 Modbus RTU or Ethernet TCP/IP. Logged data is timestamped and stored in CSV format, compatible with LIMS platforms and compliant with FDA 21 CFR Part 11 requirements when paired with user-access controls, electronic signatures, and audit trail configuration. Optional validation packages include factory-generated DQ/IQ/OQ documentation, temperature mapping reports (per ISO/IEC 17025 Annex A.3), and traceable NIST-calibrated thermocouple certificates.

Applications

• Drying and moisture content determination per AOAC 950.46 and ISO 712 for food, feed, and agricultural commodities
• Thermal aging of elastomers and plastics per ASTM D573 and ISO 188
• Pre-baking of PCBs and semiconductor wafers prior to coating or lamination
• Heat treatment of catalyst supports and metal oxide powders in R&D synthesis workflows
• Residual solvent removal from coated films and battery slurry-coated foils
• Validation of autoclave pre-drying cycles in sterile device manufacturing

FAQ

What is the maximum load weight the chamber can support without compromising temperature uniformity?
The internal shelf system is rated for static loads up to 80 kg per shelf (standard configuration); total chamber loading should not exceed 200 kg to maintain specified airflow dynamics and thermal homogeneity.
Does the oven support programmable ramp-soak profiles?
Yes—the optional ZH-TC300 controller provides up to 16 segment programmable profiles with ramp rate control from 0.1°C/min to 10°C/min.
Is third-party calibration certification included with delivery?
Factory calibration is performed using NIST-traceable reference thermometers; full UKAS-accredited calibration certificates are available as a configurable option.
Can the unit be integrated into a central building management system (BMS)?
Yes—via optional BACnet MS/TP or Modbus TCP gateway modules, enabling remote status monitoring and alarm notification through existing facility infrastructure.