Yoyi LHG-9240A Precision Forced-Air Laboratory Drying Oven

Overview

The Yoyi LHG-9240A is a precision forced-air laboratory drying oven engineered for reproducible thermal processing across research, quality control, and production environments. It operates on the principle of convection-based heat transfer, utilizing a rear-mounted blower-driven air circulation system to maintain uniform temperature distribution throughout its 225 L stainless-steel chamber. Designed in strict accordance with GB/T 30435–2013 — the Chinese national standard for electrically heated forced-convection ovens — the LHG-9240A delivers stable thermal performance from ambient +10°C up to 250°C, with a documented temperature fluctuation of ±1.0°C and uniformity of ±2.5% at 100°C under no-load conditions. Its robust architecture supports applications requiring precise thermal conditioning, including moisture removal, polymer curing, sample pre-conditioning, sterilization validation, and residual solvent evaporation in compliance with ISO/IEC 17025-accredited laboratories.

Key Features

• Microprocessor-based digital controller with LCD menu interface: enables simultaneous display and real-time monitoring of setpoint temperature, actual chamber temperature, and remaining hold time.
• Intelligent parameter retention system: automatically saves operational settings (e.g., temperature setpoint, timer duration, alarm thresholds) during unexpected power interruption; resumes operation upon power restoration without manual reconfiguration.
• Double-layer tempered glass observation window with large viewing area: permits non-intrusive visual monitoring of samples without compromising thermal integrity or airflow dynamics.
• High-efficiency forced-air convection design: integrated rear intake and exhaust ports, combined with optimized internal ducting, ensure continuous air exchange and rapid equilibration — eliminating localized hot/cold zones and minimizing condensation buildup.
• Durable construction: cold-rolled steel outer casing with electrostatic epoxy-polyester coating; mirror-finish SUS304 stainless-steel interior chamber resistant to corrosion, oxidation, and repeated cleaning cycles.
• Adjustable stainless-steel shelving: three-tier load-bearing trays (standard configuration: two included, one optional) with vertical positioning slots for flexible sample arrangement.
• High-temperature silicone door gasket: ensures consistent sealing integrity across the full operating range, extending service life and reducing energy loss.

Sample Compatibility & Compliance

The LHG-9240A accommodates a broad spectrum of sample types — from Petri dishes and crucibles to PCB assemblies, pharmaceutical tablets, polymer films, and biological tissue specimens — within its spacious 500 × 600 × 750 mm chamber. Its inert stainless-steel interior and absence of organic coatings prevent cross-contamination, making it suitable for GLP-compliant stability studies and GMP-aligned process validation. Optional inert gas inlet (with calibrated float-type flowmeter) enables oxygen-sensitive operations such as annealing of metal oxides or low-oxygen drying of hygroscopic compounds. While not certified to UL or CE standards out-of-the-box, the unit meets essential safety requirements defined in GB/T 30435–2013 and may be validated for use in ISO 17025 testing laboratories when paired with traceable calibration protocols and documented IQ/OQ/PQ procedures.

Software & Data Management

The base configuration includes an embedded microcontroller supporting programmable timing (1–9999 minutes), dual-stage temperature ramping (via optional multi-segment programmer), and configurable over-temperature alarms. For enhanced data traceability, optional RS485 serial communication enables integration with third-party SCADA systems or custom LabVIEW-based logging platforms. An optional embedded thermal printer provides hard-copy records of temperature profiles — particularly valuable for audit-ready documentation in regulated sectors such as pharmaceutical manufacturing (aligned with FDA 21 CFR Part 11 principles when used with appropriate electronic signature controls). All firmware logs include timestamps and event flags (e.g., door open, alarm activation, power cycle), supporting root-cause analysis during equipment qualification.

Applications

• Drying and moisture content determination per ASTM D229, ISO 293, or USP .
• Baking of ceramic substrates, printed circuit boards, and thin-film coatings prior to metallization or sintering.
• Accelerated aging tests for polymers and elastomers under controlled thermal stress (ISO 188, ASTM D573).
• Pre- and post-weighing desiccation of analytical standards and reference materials.
• Heat treatment of calibration weights, volumetric glassware, and metrology tools to relieve internal stresses.
• Thermal decontamination of reusable labware in biosafety level 2 (BSL-2) facilities where autoclaving is impractical.

FAQ

What is the maximum operating temperature of the LHG-9240A?
The unit is rated for continuous operation from ambient +10°C to 250°C.
Does the oven support programmable temperature ramps?
Yes — a multi-segment programmable controller is available as an optional upgrade (part number: YOYI-PTC-24), supporting up to 30 segments with independent ramp rates and soak times.
Can I validate temperature uniformity across the chamber?
Absolutely — the chamber geometry and forced-air design facilitate mapping per ISO/IEC 17025 Annex A.4; users are advised to perform 9-point sensor mapping using NIST-traceable thermocouples during initial qualification.
Is the stainless-steel interior electropolished?
No — the inner chamber features a mechanically polished mirror finish (Ra ≤ 0.8 µm), sufficient for routine cleaning and compatible with common laboratory solvents and detergents.
What electrical supply is required?
Single-phase AC 220 V ±10%, 50 Hz, with dedicated 16 A circuit breaker recommended due to peak power draw of 2050 W.