Sundy SDDH315t Nitrogen-Purged Forced-Air Drying Oven

Overview

The Sundy SDDH315t Nitrogen-Purged Forced-Air Drying Oven is an engineered solution for laboratories requiring precise, repeatable thermal processing under controlled atmospheric conditions. Designed primarily for moisture determination in coal, coke, and solid biomass fuels—per ASTM D3173 and ISO 589 standards—the oven operates on the principle of gravimetric loss-on-drying (LOD), where sample mass reduction at defined temperature and dwell time quantifies volatile content. Its dual-mode operation—standard forced-air convection and optional nitrogen inerting—enables oxidation-sensitive applications, such as low-temperature drying of reactive organics or pre-ashing protocols compliant with USP . The chamber’s vertical architecture, stainless steel construction, and optimized airflow path ensure rapid thermal equilibration and spatial uniformity across the full 550 × 450 × 600 mm working volume.

Key Features

• Programmable ramp-and-hold temperature control with user-defined start delay (up to 24 h), supporting unattended overnight operation.
• Dual-atmosphere capability: factory-ready interface for optional nitrogen purge kit—including integrated pressure regulator, flow-controlled distribution box (289 × 153 × 88 mm), and calibrated inlet port—ensuring sub-1% O₂ residual atmosphere with minimal N₂ consumption (typical flow: 0.5–2.0 L/min).
• Extended temperature range (ambient to 300 °C) exceeds standard Class B ovens (typically ambient to 250 °C), enabling broader method coverage including ASTM D2879 (volatiles in asphalt) and ISO 11358 (thermogravimetric analysis support).
• High-efficiency thermal management: triple-layer insulation (ceramic fiber + mineral wool + air gap), German-sourced low-noise centrifugal blower (≤52 dB[A]), and rear-mounted heating elements with symmetric baffle design yield ≤±1 °C chamber uniformity at 105 °C (measured per IEC 60068-3-5).
• Ergonomic vertical layout with three adjustable stainless steel shelves (load capacity: 15 kg/shelf); reinforced double-glazed observation window (tempered glass, 12 mm thick) provides real-time visual monitoring without thermal leakage.
• Microprocessor-based controller with 3.5-inch LCD interface, data logging (internal memory: 100 cycles), password-protected parameter lockout, and configurable over-temperature cut-off (adjustable threshold from 50–350 °C).

Sample Compatibility & Compliance

The SDDH315t accommodates standard crucibles (e.g., porcelain, alumina, quartz), Petri dishes, weighing boats, and custom trays up to 200 mm in diameter. Its chamber geometry supports simultaneous processing of ≥12 ASTM D3173-compliant coal samples (each in covered crucibles) or ≥6 parallel biomass pellets per run. The oven meets national metrological verification requirements per JJG 205–2005 (Drying Oven Verification Regulation) and satisfies essential safety and performance criteria outlined in GB/T 5170.2–2017 (Environmental Testing Equipment—Temperature Test Methods). For regulated environments, it supports GLP-compliant documentation when paired with external USB data export and audit trail-enabled software (optional add-on module).

Software & Data Management

While the base unit features embedded non-volatile memory for cycle history (date/time stamp, setpoint, actual profile, duration), optional PC connectivity via RS-485 enables integration with laboratory information management systems (LIMS). The companion software (SundyLabControl v2.1, Windows 10/11 compatible) provides real-time graphing, CSV export, calibration certificate generation, and 21 CFR Part 11–compliant electronic signatures when configured with user role assignment and audit log activation. All temperature profiles are traceable to national standards through factory calibration certificates (NIST-traceable Pt100 sensor, uncertainty ±0.3 °C at 105 °C).

Applications

• Moisture content determination in coal, coke, lignite, and agricultural residues per GB/T 211–2017 and ISO 589.
• Pre-drying prior to proximate analysis (ash, volatile matter, fixed carbon) per GB/T 212–2008 and ASTM D3172.
• Thermal stabilization of polymer films, pharmaceutical excipients, and ceramic precursors under inert atmosphere.
• Baking and curing of coated substrates, PCB assemblies, and battery electrode materials.
• Conditioning of hygroscopic reference standards and desiccant validation per ISO/IEC 17025 clause 7.7.

FAQ

Does the SDDH315t include a nitrogen supply or only the purge interface?
The unit ships with the nitrogen interface port and mounting hardware; the nitrogen gas cylinder, regulator, and tubing must be sourced separately.
Is the temperature uniformity validated across the entire chamber volume?
Yes—uniformity is verified using nine calibrated Pt100 probes per IEC 60068-3-5 methodology during final QA; test reports are included with each shipment.
Can the oven be integrated into a centralized lab automation network?
RS-485 Modbus RTU protocol support enables integration with SCADA or MES platforms; custom OPC UA drivers available upon request.
What maintenance intervals are recommended for the blower motor and heating elements?
Annual inspection of motor bearings and electrical connections is advised; heating element resistance should be verified every 6 months per manufacturer’s service manual.
Is third-party calibration certification available post-installation?
Yes—accredited calibration services (ISO/IEC 17025) can be arranged through Sundy’s authorized service partners in EU, NA, and APAC regions.