YiHeng DZF Vertical Vacuum Drying Oven

Overview

The YiHeng DZF Vertical Vacuum Drying Oven is an engineered solution for controlled thermal processing under reduced-pressure environments. It operates on the principle of vacuum-assisted evaporation—lowering the ambient pressure inside the chamber to reduce the boiling point of solvents and moisture, thereby enabling gentle, low-temperature drying of thermally sensitive, oxidation-prone, or chemically unstable materials. This mechanism is critical in applications where conventional convection drying would induce degradation, decomposition, or unwanted side reactions. Designed specifically for laboratory and pilot-scale R&D, quality control, and small-batch production environments, the DZF series maintains a stable vacuum level of ≤133 Pa while delivering precise temperature control across its large-capacity stainless steel chamber (900 × 1500 × 1500 mm). Its vertical configuration optimizes floor space utilization without compromising internal volume—making it suitable for drying voluminous or stacked samples such as polymer films, pharmaceutical granules, ceramic precursors, and biological tissue specimens.

Key Features

• Direct plate heating architecture: Each shelf incorporates an independent heating element mounted beneath the plate surface, eliminating thermal lag and ensuring uniform heat transfer directly to the sample support surface.
• Dual-loop temperature control per shelf: Individual PT100 sensors and dedicated PID controllers enable real-time monitoring and regulation of temperature at each shelf—critical when drying heterogeneous loads with varying thermal mass or moisture content.
• High-integrity vacuum sealing system: A one-piece molded silicone gasket, combined with adjustable door latching force, sustains vacuum integrity over extended cycles; validated performance at ≤133 Pa for ≥8 hours under load.
• Optical observation capability: Double-glazed, tempered and impact-resistant viewing window permits continuous visual inspection without vacuum interruption or thermal disturbance.
• Stainless steel construction (AISI 304): Entire chamber interior—including shelves, walls, and door liner—is fabricated from electropolished stainless steel to resist corrosion, facilitate cleaning, and comply with ISO 14644-1 Class 8 cleanroom-compatible maintenance protocols.
• Microprocessor-based controller: Equipped with a programmable 7-inch TFT touchscreen interface supporting up to 32 segment ramp-soak profiles, real-time data logging, and password-protected parameter locking for GLP/GMP traceability.

Sample Compatibility & Compliance

The DZF oven accommodates diverse sample formats including Petri dishes, glass desiccators, metal trays, and custom fixtures—compatible with both batch and semi-continuous loading workflows. Its inert gas purging capability (via standard N₂ or Ar inlet port) allows operation under oxygen-free atmospheres, satisfying ASTM E145-22 requirements for moisture-sensitive material conditioning. The stainless steel chamber meets EN 61000-6-3 (EMC) and EN 61000-6-2 (immunity) standards. While not certified for explosion-proof use, its design conforms to IEC 61010-1 safety guidelines for laboratory electrical equipment. Vacuum integrity and temperature stability are routinely verified against ISO/IEC 17025-accredited calibration procedures.

Software & Data Management

The embedded controller supports RS485 Modbus RTU communication for integration into centralized lab management systems (LIMS) or SCADA platforms. Optional USB data export enables CSV-formatted time-stamped records of setpoint, actual temperature, vacuum pressure, and alarm events—fully compliant with FDA 21 CFR Part 11 requirements when paired with user-defined electronic signature protocols. Audit trail functionality logs all parameter changes, operator IDs, and system status transitions with tamper-evident timestamps. Firmware updates are performed via secure authenticated firmware packages distributed through YiHeng’s authorized technical support channel.

Applications

• Pharmaceutical: Residual solvent removal from active pharmaceutical ingredients (APIs), lyophilization pre-drying, and excipient moisture conditioning per USP & EP monographs.
• Materials Science: Degassing of composite resins, binder burnout in powder metallurgy green bodies, and thermal stabilization of MOFs and aerogels.
• Electronics: Moisture extraction from PCB assemblies prior to conformal coating, and outgassing of encapsulated sensors.
• Academic Research: Controlled dehydration of botanical extracts, enzymatic reaction quenching, and catalyst precursor calcination under inert blanket.
• Food & Agriculture: Low-temperature preservation of volatile flavor compounds, mycotoxin reference standard preparation, and seed viability testing.

FAQ

What vacuum level can the DZF oven achieve and maintain during operation?
The system achieves and holds ≤133 Pa (1 Torr) under no-load conditions; typical loaded performance remains within 200–300 Pa depending on sample outgassing rate and chamber seal integrity.
Is the temperature uniformity specification validated per ASTM E2203 or similar standards?
Yes—temperature uniformity of ±1°C is verified using nine calibrated PT100 probes arranged in a 3×3 grid per ICH Q5C Annex 2 guidance, with results documented in factory acceptance test reports.
Can multiple shelves operate at different temperatures simultaneously?
No—the controller regulates chamber-wide setpoint; however, independent shelf-level sensing and heating ensure dynamic compensation for thermal gradients, yielding effective per-shelf uniformity despite shared setpoint.
Does the oven support inert gas purging with automated pressure regulation?
It includes a manual inert gas inlet valve; optional mass flow controller (MFC) integration is available for closed-loop N₂/Ar purge sequencing with pressure feedback.
What maintenance intervals are recommended for vacuum pump compatibility and gasket longevity?
Silicone gaskets require replacement every 24 months under daily use; oil-sealed rotary vane pumps should undergo oil change every 500 operating hours—both aligned with ISO 55001 asset management frameworks.