Zhonghuan Furnace HT-500 Forced-Air High-Temperature Drying Oven

Overview

The Zhonghuan Furnace HT-500 Forced-Air High-Temperature Drying Oven is an engineered thermal processing system designed for precise, repeatable, and stable operation across demanding laboratory and industrial quality control environments. Operating on the principle of forced convection heating—where a calibrated axial fan circulates heated air uniformly throughout the insulated chamber—the HT-500 ensures high spatial temperature uniformity (≤ ±1.5 °C at setpoint) within its 450 × 550 × 550 mm stainless steel chamber. With a maximum operating temperature of 500 °C and a minimum operational threshold of 20 °C, the oven supports a broad spectrum of thermally driven processes including moisture removal from polymers and ceramics, pre-baking of electronic components, residual solvent evaporation in pharmaceutical intermediates, stress-relief annealing of metal samples, and controlled thermal aging per ASTM E1823 or ISO 293.

Key Features

• Robust chamber construction using AISI 304 stainless steel—resistant to oxidation, corrosion, and thermal fatigue up to 500 °C
• Double-wall insulated design with high-density mineral fiber insulation (≥80 mm thickness) minimizing external surface temperature rise and energy consumption
• Precisely regulated electric resistance heating elements mounted on rear and side walls, coupled with PID-controlled solid-state relays for stable thermal response
• Adjustable-speed centrifugal blower (rated IP54) delivering consistent airflow velocity (≥0.5 m/s average across chamber cross-section) to suppress thermal stratification
• Digital microprocessor controller with dual-display interface (setpoint/actual temperature), programmable ramp-soak profiles (up to 10 segments), and auto-tuning capability
• Over-temperature protection via independent mechanical safety cutout (set at 520 °C) compliant with IEC 61000-6-2 EMC and IEC 61010-1 safety standards

Sample Compatibility & Compliance

The HT-500 accommodates standard laboratory sample carriers—including porcelain crucibles, alumina boats, stainless steel trays, and borosilicate glass Petri dishes—within its 450 × 550 × 550 mm usable volume. Its chamber geometry and airflow configuration support homogeneous thermal exposure for samples up to 15 kg total mass (distributed load). The oven meets essential requirements for GLP-compliant thermal validation: traceable calibration points (as defined in ISO/IEC 17025), documented thermal mapping protocols, and compatibility with Class A platinum RTD sensors (Pt100, 1/3 DIN B tolerance). It is routinely employed in applications aligned with USP , ASTM D2240 (Shore hardness preconditioning), and ISO 527-2 (polymer tensile specimen conditioning).

Software & Data Management

While the base HT-500 operates via front-panel controller, optional RS485 Modbus RTU or USB-to-serial interfaces enable integration with LabVIEW, MATLAB, or enterprise LIMS platforms. Data logging (timestamped temperature readings at user-defined intervals) can be exported as CSV files for audit trail generation. When configured with optional Ethernet module, the system supports remote monitoring and alarm notification via SMTP or SNMP—facilitating 21 CFR Part 11–compliant environments through optional electronic signature and audit log modules (available upon request with validated firmware version).

Applications

• Moisture content determination in raw materials (e.g., ASTM D2298, ISO 787-2)
• Thermal stabilization of catalysts and battery electrode powders prior to XRD or BET analysis
• Pre-drying of filter papers, weighing bottles, and volumetric glassware per ISO 3696 Grade 3 water specifications
• Heat treatment of calibration standards (e.g., NIST SRM 1978) for gravimetric reference stability
• Accelerated aging studies for packaging materials (ASTM F1980) and medical device polymers (ISO 11607-1)
• Residue-on-ignition (ROI) testing in environmental soil and wastewater sludge analysis (EPA Method 9081)

FAQ

What is the maximum continuous operating temperature of the HT-500?
The HT-500 is rated for continuous operation at 500 °C; extended exposure above this limit may compromise heater longevity and chamber integrity.
Does the oven support GMP/GLP documentation requirements?
Yes—when equipped with optional data logging and calibration certificate packages, it supports IQ/OQ documentation frameworks and satisfies traceability requirements per ISO/IEC 17025 Clause 6.4.2.
Can the internal chamber be customized with additional shelving or perforated trays?
Standard configuration includes two adjustable stainless steel shelves; custom perforated trays or multi-level rack systems are available as OEM accessories (lead time: 4–6 weeks).
Is the temperature controller compliant with international calibration standards?
The integrated Pt100 sensor and controller meet IEC 60751 Class B tolerance; optional factory calibration certificates (NIST-traceable) are provided upon request.
How is thermal uniformity verified during installation qualification?
Zhonghuan Furnace recommends a 9-point thermal mapping protocol (per ASTM E2251) using calibrated thermocouples placed at defined geometric locations, repeated at three representative temperatures (100 °C, 300 °C, and 500 °C).