Zhonghuan Furnace ZKB Stainless Steel Electrically Heated Vacuum Drying Oven

Overview

The Zhonghuan Furnace ZKB Stainless Steel Electrically Heated Vacuum Drying Oven is an engineered solution for controlled thermal processing under reduced-pressure conditions. It operates on the principle of vacuum-assisted moisture removal—lowering the boiling point of solvents and volatile components to enable gentle, low-temperature drying without thermal degradation. Combined with electric resistance heating and forced-air circulation, the unit maintains stable thermal distribution across the chamber volume, minimizing axial and radial temperature gradients. This architecture supports applications requiring precise thermal history control, including solvent-free drying of heat-sensitive pharmaceutical intermediates, residual moisture reduction in polymer samples prior to FTIR analysis, and pre-conditioning of reference standards in metrology laboratories. The oven is not designed for sterilization per ISO 17665 or EN 285; however, its 250 °C maximum operating temperature allows for extended thermal hold cycles compatible with certain depyrogenation protocols when validated in situ.

Key Features

• Full stainless steel construction (AISI 304-grade inner chamber and outer casing), ensuring corrosion resistance, non-contaminating surface integrity, and compliance with cleaning validation requirements in regulated environments.
• Forced convection system with rear-mounted centrifugal blower and adjustable airflow baffle—engineered to achieve ≤±1.5 °C temperature uniformity (measured per ASTM E2207 at 100 °C, 50 mbar).
• Dual-layer tempered glass observation door with silicone-sealed frame, enabling real-time visual monitoring without vacuum break or thermal disturbance.
• Microprocessor-based dual-display controller featuring independent setpoint and actual temperature readouts, programmable ramp-soak profiles, and over-temperature cut-off protection (hardware-independent safety circuit).
• Dedicated vacuum port (KF-25 flange) with integrated pressure relief valve and vacuum gauge interface—compatible with oil-lubricated or dry scroll vacuum pumps (recommended ultimate vacuum: ≤10 Pa).
• No internal plastic components or organic gaskets within the heated zone—eliminating outgassing risks during high-temperature vacuum operation.

Sample Compatibility & Compliance

The ZKB series accommodates standard laboratory sample formats: stainless steel trays (up to 300 mm × 300 mm), borosilicate glass Petri dishes, aluminum weighing boats, and sealed crimp-top vials (with appropriate venting). It is unsuitable for samples containing peroxides, nitrocellulose, or other shock-sensitive compounds. While not certified to UL 61010-1 or CE Machinery Directive as a standalone system (requires integration verification by end-user), its electrical design conforms to IEC 61000-6-3 (EMC emission limits) and IEC 61000-6-2 (immunity). Documentation packages support IQ/OQ protocol development for GxP environments, including traceable calibration templates for temperature and vacuum sensors.

Software & Data Management

The embedded controller supports RS-485 Modbus RTU communication for integration into centralized lab monitoring systems (e.g., LabVantage, Siemens Desigo CC). Optional USB data logger module enables time-stamped recording of chamber temperature, setpoint, and vacuum level at user-defined intervals (1–300 seconds), generating CSV files compliant with FDA 21 CFR Part 11 audit trail requirements when paired with validated timestamping firmware. No cloud connectivity or proprietary software installation is required—data export remains local and deterministic.

Applications

• Residual solvent removal from active pharmaceutical ingredients (APIs) prior to lyophilization or tablet compression.
• Moisture content determination per USP <921> using gravimetric loss-on-drying methodology under controlled vacuum.
• Thermal aging studies of encapsulation resins and conformal coatings per IPC-CC-830B.
• Drying of hygroscopic reference materials (e.g., sodium chloride, potassium hydrogen phthalate) for primary calibration in analytical balance labs.
• Pre-baking of quartz crystal microbalance (QCM) sensors and MEMS devices to eliminate adsorbed water layers.

FAQ

Is the ZKB oven supplied with a vacuum pump?
No—the unit includes only the vacuum port and pressure relief assembly. Users must specify and integrate a compatible external vacuum pump based on required ultimate pressure and gas load.
Can the chamber be purged with inert gas?
Yes—via optional N₂ inlet fitting (part no. ZKB-GAS-KIT), enabling controlled atmosphere drying for oxidation-sensitive materials.
What calibration documentation is provided?
Factory calibration certificate for temperature sensor (NIST-traceable Pt100 probe) and vacuum transducer (capacitance manometer) is included. As-found/as-left data is recorded per ISO/IEC 17025 guidelines.
Does the controller support password-protected parameter locking?
Yes—three-tier access control (Operator / Technician / Administrator) with configurable lockout for critical parameters including max temperature limit and vacuum interlock thresholds.
What maintenance intervals are recommended?
Blower motor lubrication every 2,000 operating hours; door gasket inspection and replacement every 12 months or after 500 vacuum cycles—whichever occurs first.