Yoyi LHG-9145A Vertical Forced-Air Constant-Temperature Drying Oven

Overview

The Yoyi LHG-9145A Vertical Forced-Air Constant-Temperature Drying Oven is an engineered solution for precise thermal processing in research laboratories, quality control environments, and industrial R&D settings. Designed around the principle of forced convection heat transfer, this oven employs a rear-mounted axial fan and optimized air duct architecture to ensure uniform temperature distribution across the entire working chamber—critical for applications demanding reproducible drying, baking, sterilization, or thermal aging. Its operational range spans from ambient +10°C to 300°C, meeting the extended thermal requirements of polymer curing, pharmaceutical residual solvent removal, and high-temperature material conditioning. The unit complies fully with GB/T 30435–2013, the national standard governing performance verification, safety, and metrological traceability of electric heating ovens in China—ensuring alignment with internationally recognized test methodologies for temperature uniformity, stability, and recovery time.

Key Features

• Microprocessor-based PID temperature controller with intuitive LCD menu interface, supporting simultaneous display of setpoint, real-time chamber temperature, and remaining hold time
• Mirror-finish SUS304 stainless steel interior chamber with smooth, non-porous surfaces for easy cleaning and resistance to corrosion from acidic or alkaline volatiles
• Double-layer tempered glass observation window with silicone gasket sealing, enabling visual monitoring without compromising thermal integrity or operator safety
• Robust cold-rolled steel outer casing with electrostatic epoxy-polyester powder coating for mechanical durability and chemical resistance
• High-efficiency rear-mounted air circulation system with automatic intake/exhaust modulation, eliminating manual damper adjustment and facilitating rapid moisture evacuation during drying cycles
• Independent over-temperature cut-off circuit (optional), providing hardware-level protection that interrupts power when preset safety thresholds are exceeded—fully compliant with IEC 61000-4-5 surge immunity and EN 61010-1 safety requirements
• Power-loss recovery function with non-volatile parameter memory, restoring pre-interruption settings upon re-energization without user intervention

Sample Compatibility & Compliance

The LHG-9145A accommodates diverse sample formats—including Petri dishes, weighing boats, crucibles, glassware, and standardized test specimens—within its 136 L internal volume. Its stainless steel chamber and removable adjustable shelves (standard: 2 pcs, load capacity ≤15 kg per shelf) support both static and dynamic loading configurations. The oven meets GB/T 30435–2013 verification criteria for temperature uniformity (±2.5% at 100°C, empty), fluctuation (±1.0°C), and recovery time (<15 min after 10% door opening). While not certified to ISO/IEC 17025 or ASTM E145, its design facilitates integration into GLP- and GMP-aligned workflows through optional audit-trail-capable data logging interfaces. All electrical components conform to CE marking directives (2014/30/EU EMC, 2014/35/EU LVD), and the enclosure satisfies IP20 ingress protection classification per IEC 60529.

Software & Data Management

Data acquisition and remote supervision are enabled via optional RS485 serial interface (Modbus RTU protocol), compatible with industry-standard SCADA platforms and laboratory information management systems (LIMS). An embedded thermal printer option provides hard-copy records of temperature profiles, timestamps, and alarm events—supporting 21 CFR Part 11-compliant documentation when paired with appropriate electronic signature controls. For advanced process validation, the optional multi-segment programmable controller supports up to 30 ramp-hold cycles with independent rate and dwell parameters, enabling automated thermal protocols for accelerated aging studies (e.g., IPC-TM-650 2.6.25) or desiccation kinetics analysis. All firmware updates are delivered via secure USB flash drive, with version logs retained in non-volatile memory.

Applications

This drying oven serves validated roles across multiple regulated and non-regulated domains: moisture content determination per AOAC 950.46 and USP ; pre- and post-weighing sample conditioning in analytical chemistry; thermal stabilization of calibration standards; depyrogenation of glassware in pharmaceutical QC labs; vulcanization and cross-linking of elastomers; drying of botanical extracts and agricultural samples per ISO 664; and pre-baking of PCB substrates prior to solder paste application. Its consistent airflow dynamics and minimal thermal overshoot make it suitable for applications where localized hot spots could compromise sample integrity—such as enzyme activity assays requiring strict thermal history control.

FAQ

What is the maximum operating temperature, and is it validated at 300°C?
The LHG-9145A is rated for continuous operation up to 300°C, with factory calibration verified at 100°C, 150°C, 200°C, and 300°C using NIST-traceable PT100 sensors. Thermal uniformity testing per GB/T 30435–2013 is performed at each point.
Can the oven be used under inert atmosphere conditions?
Yes—when equipped with the optional inert gas inlet kit (including stainless steel quick-connect port and precision float-type flowmeter), the chamber can be purged with nitrogen or argon to prevent oxidation during heat treatment of sensitive materials.
Is the temperature resolution sufficient for ISO/IEC 17025-accredited testing?
With 0.1°C digital resolution and ±1.0°C fluctuation specification, the unit meets minimum resolution requirements for most routine thermal validation tasks; however, formal accreditation requires third-party verification against ISO/IEC 17025 Clause 6.4.3 for measurement uncertainty.
Are replacement parts such as door gaskets and fan assemblies available?
All consumable and wear components—including high-temperature silicone door seals (rated to 350°C), axial fans, and SUS304 shelving—are stocked and supplied with full dimensional drawings and RoHS-compliant material certifications.
Does the oven support external data logging without the RS485 option?
No—real-time digital output requires either the RS485 interface or the embedded thermal printer; analog voltage outputs (e.g., 0–5 VDC proportional to temperature) are not supported on this model.