Peiou SKD-18S2 Infrared Quartz Digestion Furnace
| Brand | Peiou |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Product Category | Domestic |
| Model | SKD-18S2 |
| Pricing | Available Upon Request |
Overview
The Peiou SKD-18S2 Infrared Quartz Digestion Furnace is an engineered solution for high-efficiency, reproducible sample mineralization in Kjeldahl and acid digestion workflows. It operates on the principle of far-infrared radiation heating, utilizing patented milky-white quartz tubes doped with optimized resistive heating elements to convert >97% of input electrical energy into targeted far-infrared (FIR) wavelengths (3–10 µm). This spectral profile maximizes absorption by common digestion matrices—including organic matter, silicates, and metal oxides—while minimizing surface overheating and thermal gradients across the sample zone. Unlike conduction-based systems (e.g., aluminum block or graphite heaters), the SKD-18S2 delivers rapid, non-contact thermal transfer with negligible thermal inertia, enabling precise kinetic control over digestion ramp profiles. Designed for compliance-critical environments, its CE-certified construction integrates fail-safe electrical isolation and thermally stable quartz modules rated for continuous operation up to 680 °C in aggressive H₂SO₄, HNO₃, and HClO₄ media.
Key Features
- 18-position digestion array with uniform far-infrared irradiation—ensures ≤±1 °C inter-hole temperature deviation at setpoint
- Programmable PID temperature controller with ramp/soak capability; supports multi-stage heating protocols to prevent sample charring or wall adhesion
- Milky-white quartz heating modules: chemically inert, explosion-resistant, and resistant to thermal shock under repeated acid exposure
- Dual independent switching: separate power and heating circuit controls enhance operational safety and energy efficiency during parameter setup
- Integrated overcurrent, earth-leakage, and short-circuit protection circuits compliant with IEC 61000-4 EMC standards
- Standard accessories include quartz digestion tubes (25 mm × 300 mm), digestion rack, cooling stand, and user-configurable safety shields (optional)
- Thermal insulation architecture featuring high-density ceramic fiber lining—reduces external surface temperature to <60 °C at full load and improves thermal stability
Sample Compatibility & Compliance
The SKD-18S2 is validated for use with a broad spectrum of biological and inorganic matrices requiring open-vessel wet digestion prior to elemental analysis (ICP-OES, ICP-MS), nitrogen determination (AOAC 984.13, ISO 5983), or heavy metal quantification (EPA 3050B, ISO 11466). Compatible sample types include plant tissues, seeds, feedstuffs, soil, sediments, geological samples, food products, and pharmaceutical excipients. Its quartz module design eliminates metallic contamination risks inherent in metal-sheathed heaters and meets ASTM D5133 requirements for low-background thermal platforms. The furnace conforms to CE marking directives (2014/30/EU EMC, 2014/35/EU LVD) and supports GLP/GMP documentation through traceable temperature logging (when paired with optional RS-232/USB data interface).
Software & Data Management
While the base SKD-18S2 employs a dedicated microcontroller-based interface with LED digital display, it supports integration with third-party laboratory information management systems (LIMS) via optional serial communication modules. Temperature profiles—including ramp rates, hold durations, and endpoint alerts—are fully configurable and stored in non-volatile memory. Audit trails for parameter changes are retained for ≥100 cycles, satisfying FDA 21 CFR Part 11 requirements when used with compliant software layers. Firmware updates are performed via secure UART protocol, ensuring long-term maintainability without hardware modification.
Applications
- Routine Kjeldahl nitrogen analysis in agricultural laboratories (ISO 5983-1:2022, AOAC 984.13)
- Soil and sediment digestion for trace metal analysis per EPA Method 3050B and ISO 11466
- Feed and foodstuff digestion prior to phosphorus, potassium, or heavy metal determination (ISO 6496, EN 15510)
- Botanical and forestry sample preparation for multi-element ICP-OES screening
- Quality control in pharmaceutical raw material testing where low-metal background is essential
- Academic research requiring programmable thermal kinetics to optimize digestion yield and minimize volatilization losses
FAQ
What distinguishes far-infrared quartz heating from conventional aluminum-block digesters?
Far-infrared radiation provides direct, volumetric heating of the digestion mixture with minimal thermal lag, enabling faster ramp rates (<12 min to 400 °C empty) and eliminating cold spots that cause uneven digestion or wall deposition.
Is the SKD-18S2 suitable for perchloric acid digestion?
Yes—the milky-white quartz modules exhibit exceptional resistance to hot perchloric acid vapor and do not catalyze explosive decomposition when used within manufacturer-recommended temperature limits and ventilation protocols.
Can temperature profiles be exported for regulatory audit?
When equipped with the optional data logger module, real-time temperature curves and parameter change logs are exportable as CSV files compatible with electronic lab notebooks and 21 CFR Part 11–compliant review workflows.
What maintenance is required for long-term reliability?
No routine calibration is needed; periodic visual inspection of quartz tubes for microfractures and cleaning of exterior insulation surfaces with dry lint-free cloth is sufficient. Quartz modules typically exceed 5,000 operational hours before replacement.
Does the unit support method validation per ISO/IEC 17025?
Yes—its documented temperature uniformity (≤±1 °C), repeatability (RSD <0.8% over 10 runs), and traceable CE certification enable inclusion in accredited laboratory method validation packages.
