Shanghai Xinrui SX-12-10 / SX-2.5-10 / SX-4-10 / SX-8-10 Benchtop Muffle Furnace Series

Overview

The Shanghai Xinrui SX-Series benchtop muffle furnaces (models SX-2.5-10, SX-4-10, SX-8-10, and SX-12-10) are precision-engineered, resistance-heated laboratory furnaces designed for reliable, repeatable thermal processing in controlled atmospheric conditions. Operating at a maximum rated temperature of 1000 °C, these furnaces employ Kanthal A1 or equivalent high-resistance alloy heating elements embedded within a thermally insulated chamber, ensuring uniform heat distribution and minimal thermal loss. The muffle design isolates the sample chamber from direct contact with heating elements and combustion byproducts—critical for ashing, calcination, annealing, and heat-treatment applications requiring chemical purity and thermal stability. Constructed with cold-rolled steel outer casings finished via electrostatic powder coating, and lined with high-purity refractory ceramic fiber insulation (density ≥ 128 kg/m³), each unit delivers robust thermal efficiency and long-term dimensional stability under cyclic operation.

Key Features

• Four standardized models offering scalable chamber volumes—from compact 2.5 L (SX-2.5-10) to 30 L (SX-12-10)—to accommodate diverse sample throughput requirements.
• Front-loading, counterbalanced door mechanism with ergonomic lever handle enables smooth, vibration-free opening/closing; door seal integrity maintained via gravity-assisted compression against a refractory gasket.
• Independent dual-layer insulation: high-alumina brick lining (≥ 92% Al₂O₃) forms the inner furnace wall, while low-conductivity ceramic fiber board (thermal conductivity ≤ 0.09 W/m·K at 600 °C) fills the annular space between chamber and shell.
• Integrated over-temperature protection circuit with independent bimetallic cut-off switch (set point: 1050 °C) complies with IEC 61000-4-2/4-4 immunity standards for laboratory safety.
• Standard analog control panel featuring adjustable PID temperature controller (±1 °C accuracy at 1000 °C), digital temperature display, and manual power adjustment knob for ramp-hold profiling.

Sample Compatibility & Compliance

These muffle furnaces support inert, oxidizing, and mildly reducing atmospheres—ideal for ash content determination per ASTM D3174, ISO 1171, or USP ; quantitative residue analysis in food, pharmaceutical, and environmental testing; and thermal pretreatment of crucibles, filters, and catalyst supports. All models meet CE marking requirements for electromagnetic compatibility (EMC Directive 2014/30/EU) and low-voltage safety (LVD Directive 2014/35/EU). The SX-Series is compatible with GLP-compliant workflows when paired with external data loggers supporting audit-trail functionality (e.g., compliant with FDA 21 CFR Part 11 when validated).

Software & Data Management

While the base configuration features analog PID control, optional RS-485 Modbus RTU interface (available upon request) enables integration with SCADA systems or centralized lab management platforms. Third-party software such as LabVIEW™ or custom Python-based acquisition scripts can monitor real-time temperature, power draw, and cycle status via ASCII protocol commands. For traceability-critical applications, users may deploy external Class I thermocouple data loggers (e.g., Omega OM-DAQPRO-5300) calibrated to NIST-traceable standards, supporting full-cycle documentation including ramp rate, dwell time, and cooling profile export in CSV or PDF format.

Applications

• Quantitative ash analysis in coal, biomass, plastics, and lubricants per ASTM D2570, ISO 6297, and EN 14774.
• Pre-conditioning of Pt, Al₂O₃, and quartz crucibles prior to gravimetric analysis or ICP-MS sample preparation.
• Thermal stabilization of reference materials and calibration standards used in analytical chemistry laboratories.
• Low-stress annealing of small metal components (e.g., springs, fasteners) and sintering of ceramic green bodies below 1000 °C.
• Residue-on-ignition (ROI) testing in wastewater sludge and soil samples according to EPA Method 9080A.

FAQ

What is the maximum continuous operating temperature?
The SX-10 series is rated for continuous operation at 1000 °C; intermittent use up to 1050 °C is permissible with reduced element lifetime.
Can these furnaces be used under vacuum or controlled gas flow?
No—these are open-atmosphere muffle furnaces without gas inlet/outlet ports or vacuum flanges. For inert-gas or vacuum applications, consider dedicated tube furnace or vacuum muffle configurations.
Is calibration certification included?
Factory calibration certificate (as-found/as-left) is available as an optional add-on; on-site verification using a NIST-traceable handheld thermometer (e.g., Fluke 1523) is recommended prior to first use.
What maintenance is required for long-term reliability?
Annual inspection of heating element continuity, door gasket compression force, and insulation integrity is advised. Avoid rapid thermal cycling beyond 5 °C/min to minimize refractory microcracking.
Are replacement parts readily available?
Yes—standardized heating elements, thermocouples (Type K), and ceramic fiber insulation kits are stocked and shipped globally within 5 business days.