Jihepu DHG-9075A Forced-Air Constant-Temperature Drying Oven

Overview

The Jihepu DHG-9075A Forced-Air Constant-Temperature Drying Oven is an entry-level benchtop thermal processing instrument engineered for precision drying, baking, sterilization, and wax melting in industrial QA/QC laboratories, academic research facilities, and pharmaceutical R&D environments. It operates on the principle of forced convection—using a high-temperature-stable axial fan and optimized internal airflow channels to ensure uniform thermal distribution across the working chamber. Unlike natural-convection ovens, this design minimizes temperature gradients and accelerates heat transfer, enabling reproducible thermal treatment of samples under controlled ambient conditions. The unit complies with fundamental safety and performance expectations aligned with IEC 61010-1 (Electrical Safety for Laboratory Equipment) and supports routine validation protocols required under GLP-compliant workflows.

Key Features

• Digital microprocessor-based temperature controller with 0.1°C resolution and ±1°C uniformity across the entire chamber volume (measured at empty-load, 20°C ambient, 50% RH).
• Mirror-finish stainless steel inner chamber (standard configuration), fabricated via argon arc welding for corrosion resistance, ease of cleaning, and long-term dimensional stability under repeated thermal cycling.
• Robust outer casing constructed from cold-rolled steel with powder-coated finish, ensuring mechanical rigidity and resistance to incidental abrasion in shared lab spaces.
• High-efficiency forced-air circulation system featuring a thermally rated fan capable of continuous operation up to 300°C, integrated with directional baffles to suppress laminar zones and promote isotropic heating.
• Independent over-temperature protection circuit (optional), compliant with EN 60519-1 safety requirements, which automatically cuts power if user-defined upper limits are exceeded—critical for unattended overnight operation.
• Programmable timer (1–9999 minutes) with audible end-of-cycle alert; optional upgrade to 30-segment programmable LCD controller available for multi-step thermal profiles.

Sample Compatibility & Compliance

The DHG-9075A accommodates standard laboratory glassware (e.g., Petri dishes, weighing boats, crucibles) and metal trays up to 400 mm × 400 mm footprint. Its 450 mm depth allows vertical stacking of multiple sample layers when using optional reinforced shelving (not included). While not certified for vacuum or inert-atmosphere operation, the oven meets baseline thermal stability criteria referenced in ASTM E145–22 (“Standard Specification for Gravity-Convection and Forced-Ventilation Ovens”) for non-vacuum drying applications. It is routinely deployed in accordance with USP (Sterility Assurance) for low-risk depyrogenation of glassware and ISO 5600-2:2021 (Innovation Management) for prototype thermal conditioning. Note: For GMP-regulated processes requiring audit trails, optional RS485 interface (with Modbus RTU protocol support) enables integration into centralized environmental monitoring systems.

Software & Data Management

The base configuration includes a standalone digital controller with real-time temperature display, setpoint memory, and manual timer activation. Optional accessories expand data handling capabilities: the RS485 communication module (part no. DHG-RS485-01) permits bidirectional control and logging via third-party SCADA or LIMS platforms. When paired with supplied Windows-compatible software, users can export time-stamped temperature logs (.csv), configure alarm thresholds, and generate basic compliance reports. Though not FDA 21 CFR Part 11 compliant out-of-the-box, the system supports ALCOA+ principles—data integrity is maintained through write-protected EEPROM storage of critical parameters and hardware-enforced timer reset logic. Printer interface (optional) produces hard-copy records suitable for batch documentation in non-critical manufacturing settings.

Applications

• Moisture content determination per AOAC 950.46 and ISO 665 (drying to constant mass at 105°C).
• Pre- and post-weighing desiccation of filter papers, soil samples, and polymer pellets prior to gravimetric analysis.
• Thermal stabilization of calibration standards (e.g., reference weights, volumetric glassware) before metrological verification.
• Baking of ceramic substrates and printed circuit board (PCB) assemblies during prototyping phases.
• Low-temperature sterilization of non-critical lab tools (forceps, spatulas) where autoclaving is impractical.
• Accelerated aging studies of packaging materials under ISO 11607-1 accelerated shelf-life testing protocols (at sub-glass-transition temperatures).

FAQ

Is the DHG-9075A suitable for sterilization of medical devices?

No. This unit is not validated for microbiological kill efficacy and lacks the pressure, humidity, and dwell-time controls required by ISO 17665 for steam sterilization or ISO 11137 for radiation-based methods.

Can the oven be used under inert gas purging?

Not without modification. The standard model has no gas inlet/outlet ports or sealed purge interface; retrofitting requires engineering review and voids factory warranty.

What is the maximum load capacity for uniform heating?

For ±1°C uniformity, total mass should not exceed 15 kg. Exceeding this may degrade airflow efficiency and increase recovery time after door opening.

Does the stainless steel chamber resist hydrochloric acid fumes?

Mirror-finish 304 stainless steel offers moderate resistance to dilute acidic vapors but is not recommended for prolonged exposure to concentrated HCl or HF—use fume hood integration for such applications.

Is calibration certificate included with shipment?

A factory-as-tested temperature uniformity report is provided. NIST-traceable calibration certification (per ISO/IEC 17025) is available as a paid service upon request.