Yoyi LHG-9030A Precision Forced-Air Constant-Temperature Drying Oven

Overview

The Yoyi LHG-9030A is a precision forced-air constant-temperature drying oven engineered for reproducible thermal processing in research laboratories, quality control environments, and industrial R&D settings. It operates on the principle of convective heat transfer, utilizing a rear-mounted centrifugal blower and an optimized internal duct system to ensure uniform airflow distribution across the entire working chamber. This architecture enables stable temperature maintenance within ±1.0°C fluctuation and ±2.5% uniformity (measured at 100°C under no-load conditions), meeting the performance requirements specified in GB/T 30435–2013 — the national standard governing electrically heated forced-convection drying ovens in China. The unit is designed for applications including moisture content determination, pre-weighing sample conditioning, polymer curing, pharmaceutical stability testing, sterilization of glassware, and thermal aging of electronic components. Its compact footprint (445×470×700 mm external) and 30 L chamber volume make it suitable for benchtop deployment in space-constrained analytical labs.

Key Features

• Microprocessor-based intelligent temperature control system with PID algorithm, supporting precise setpoint regulation from ambient +10°C to 250°C in 0.1°C increments.
• LCD menu-driven interface displaying real-time chamber temperature, set temperature, elapsed time, and remaining hold time simultaneously.
• Power-failure recovery function: automatically resumes prior operating parameters after unexpected power interruption.
• Dual-layer tempered glass observation window with anti-fog coating, enabling unobstructed visual monitoring without opening the door.
• Mirror-finish SUS304 stainless steel interior chamber and adjustable stainless steel shelving for corrosion resistance and easy cleaning.
• High-efficiency forced-air circulation system with rear-mounted blower and directional ducting to minimize thermal stratification.
• Integrated automatic exhaust/intake vents that dynamically manage internal humidity and prevent condensation buildup during extended low-temperature drying cycles.
• Optional independent over-temperature protection circuit (cut-off at user-defined limit), compliant with IEC 61000-4-5 surge immunity requirements.

Sample Compatibility & Compliance

The LHG-9030A accommodates a broad range of sample types, including but not limited to biological tissue specimens, granular pharmaceutical excipients, ceramic powders, polymer pellets, metal coupons, and electronic substrates. Its stainless steel chamber and non-reactive heating elements ensure compatibility with mildly acidic or alkaline samples under controlled thermal exposure. The unit conforms to GB/T 30435–2013 for metrological performance, mechanical safety, and electromagnetic compatibility. While not certified to ISO/IEC 17025 or GLP as a standalone instrument, its optional RS485 interface supports integration into validated laboratory information management systems (LIMS) with full audit trail capability when paired with compliant data acquisition software. For GMP-regulated environments, the optional multi-segment programmable controller allows creation of defined thermal profiles traceable to SOPs.

Software & Data Management

The LHG-9030A supports digital connectivity through optional RS485 serial interface (Modbus RTU protocol), enabling remote parameter configuration, real-time temperature logging, and alarm event reporting via third-party SCADA or LabVIEW-compatible platforms. When equipped with the embedded thermal printer option, users can generate hard-copy records of temperature profiles and operational timestamps—critical for regulatory documentation in food safety (HACCP), pharmaceutical (ICH Q1A–Q1E), and materials testing workflows. All logged data includes date/time stamps, operator ID fields (via software input), and checksum-verified integrity flags. Firmware updates are performed via USB port using manufacturer-provided utilities, ensuring long-term compliance with evolving cybersecurity best practices for laboratory instrumentation.

Applications

• Moisture loss-on-drying (LOD) analysis per USP & ASTM D2298 standards.
• Pre-conditioning of reference standards prior to gravimetric analysis or FTIR calibration.
• Thermal stabilization of sensor elements and MEMS devices before functional testing.
• Baking of printed circuit board (PCB) assemblies to remove residual solvents and moisture prior to conformal coating.
• Accelerated aging studies of elastomers and adhesives under controlled isothermal conditions.
• Heat treatment of calibration weights and volumetric glassware to relieve internal stress.
• Low-temperature desiccation of hygroscopic reagents in analytical chemistry workflows.

FAQ

What is the maximum recommended continuous operating temperature?
The LHG-9030A is rated for continuous operation up to 250°C. Sustained use above this threshold may compromise heater element longevity and seal integrity.
Can the oven be used under inert atmosphere?
Yes — the optional inert gas inlet port (with calibrated float flowmeter) enables nitrogen or argon purging to prevent oxidation during thermal processing of sensitive materials.
Is the temperature uniformity verified per ISO 17025-accredited methods?
Uniformity testing is conducted per GB/T 30435–2013 using nine-point thermocouple mapping in empty chamber; formal ISO/IEC 17025 accreditation requires lab-specific validation protocols.
How many shelves are included, and are additional ones available?
Two adjustable stainless steel shelves are supplied standard; replacement or supplementary shelves (SUS304, 300×300 mm) are available as spares under part number YO-LHG-SH300.
Does the unit support ramp-and-soak programming?
Ramp-and-soak functionality is available only with the optional multi-segment programmable controller (PN: YO-PC900), which supports up to 30 segments and 8 cycles.