DRETOP TGF-9240KLM Built-in HEPA-Filtered Clean Hot Air Circulating Oven

Overview

The DRETOP TGF-9240KLM is a precision-engineered forced-air clean oven designed for laboratories requiring thermally stable, particle-controlled drying, sterilization, and thermal treatment environments. Unlike standard convection ovens, the TGF-9240KLM integrates a built-in HEPA-grade filtration system directly into its air circulation pathway—ensuring that recirculated chamber air is continuously filtered to minimize particulate reintroduction during operation. Its working principle relies on a high-efficiency axial fan coupled with a symmetrically optimized wind tunnel structure, delivering uniform airflow across the full chamber volume. The oven operates within a precise control range of RT+10°C to 250°C, with a temperature fluctuation of ±0.5°C and uniformity of ±2.5°C (measured per ISO 17025-compliant point mapping at 100°C), making it suitable for applications demanding strict thermal reproducibility—including dry-heat sterilization of glassware, residual moisture analysis, polymer thermal aging, and pre-conditioning of analytical standards.

Key Features

• Full-welded brushed stainless steel inner chamber (AISI 304 equivalent) with seamless corners to prevent particle accumulation and facilitate cleaning under GLP-compliant protocols
• Integrated HEPA-class air filtration at both intake and exhaust ducts—reducing airborne particulates ≥0.3 µm by >99.97% during continuous recirculation
• Microprocessor-based PID temperature controller with 0.1°C resolution, real-time deviation monitoring, and self-diagnostic fault code display (e.g., E01 = sensor open circuit, E02 = overtemperature)
• Dual-stage rotary door lock mechanism with high-temperature silicone gasket (rated to 300°C), ensuring consistent seal integrity and minimizing thermal leakage
• Double-layer tempered glass observation window with anti-fog coating, enabling non-intrusive visual monitoring without compromising thermal stability
• Two independently adjustable, removable stainless steel shelves with 25 mm vertical increment adjustment—compatible with ISO-standard tray formats
• Auto-dehumidification mode: programmable venting cycle activates when internal humidity exceeds user-defined thresholds, preventing condensation during cool-down phases
• Power failure recovery function retains set parameters and resumes operation upon power restoration—critical for unattended overnight runs

Sample Compatibility & Compliance

The TGF-9240KLM accommodates a broad spectrum of non-volatile, non-explosive samples including borosilicate glassware, ceramic crucibles, metal calibration standards, pharmaceutical excipients, polymer films, and microbiological media plates. It complies with key international safety and performance benchmarks: IEC 61010-1 (Electrical Safety for Laboratory Equipment), EN 60529 (IP20 ingress protection), and supports validation against USP (Dry Heat Sterilization) and ISO 14644-1 Class 8 (cleanroom-compatible operation when installed in controlled environments). While not rated for vacuum or inert gas operation, its sealed construction and filtered airflow meet requirements for ISO/IEC 17025-accredited labs performing thermal preconditioning prior to gravimetric or chromatographic analysis.

Software & Data Management

The standard configuration includes an embedded LCD interface supporting multi-segment time-temperature programming (up to 30 steps), event logging (start/stop times, temperature deviations, alarm triggers), and real-time curve visualization. Optional upgrades include: (1) USB data export module for CSV-formatted temperature/time logs and trend graphs; (2) 7-inch color touchscreen controller with Ethernet connectivity and remote monitoring via HTTP/HTTPS; (3) RS-485 Modbus RTU interface for integration into LabVantage or Thermo Fisher SampleManager LIMS platforms; (4) optional thermal printer output for GxP-compliant hardcopy records (meeting FDA 21 CFR Part 11 requirements when paired with electronic signature-enabled software). All firmware versions maintain audit trail functionality—recording operator ID, parameter changes, and system events with timestamped metadata.

Applications

• Dry-heat sterilization of reusable labware (e.g., pipette tips, Petri dishes, volumetric flasks) per WHO TRS 961 Annex 2 guidelines
• Moisture content determination in coal, soil, and food matrices (ASTM D3173, AOAC 950.46)
• Thermal aging studies of elastomers and encapsulants per ASTM D573 and IPC-TM-650 2.6.22
• Baking of thin-film semiconductor substrates prior to sputtering or spin-coating
• Pre-drying of reference standards for Karl Fischer titration and loss-on-drying assays
• Conditioning of desiccant materials and molecular sieves used in gas purification systems
• Stabilization of calibration weights and gauge blocks in metrology labs (ISO/IEC 17025 Clause 6.4.7)

FAQ

Does the TGF-9240KLM support validation documentation (IQ/OQ/PQ)?
Yes—DRETOP provides a comprehensive validation support package including factory-as-tested calibration certificates (NIST-traceable Pt100 sensors), URS checklist alignment, and blank protocol templates compliant with EU Annex 15 and ASTM E2500.
Can the HEPA filter be replaced in-house, and what is its service life?
The filter cartridge is tool-free accessible and replaceable using standard PPE; typical service interval is 6–12 months depending on ambient particulate load and daily runtime—filter status is monitored via differential pressure sensor and displayed on the main screen.
Is the oven compatible with external data acquisition systems?
Yes—via optional RS-485 interface (Modbus RTU protocol) or analog 4–20 mA output (for temperature only), enabling integration with Siemens Desigo, Honeywell Experion, or custom SCADA architectures.
What is the maximum recommended load mass for maintaining specified uniformity?
For guaranteed ±2.5°C uniformity at 150°C, total load should not exceed 15 kg distributed evenly across both shelves; loading density must allow ≥25 mm clearance from all chamber walls and the rear air baffle.
Does the unit meet electromagnetic compatibility (EMC) requirements for use near sensitive instrumentation?
Yes—it conforms to EN 61326-1 (industrial environment) and has been tested for radiated emissions (<30 dBµV/m at 3 m) and immunity to electrostatic discharge (±8 kV contact, ±15 kV air per IEC 61000-4-2).