BOXUN SX2-Z Series Intelligent Integrated Box-Type Muffle Furnace

Overview

The BOXUN SX2-Z Series Intelligent Integrated Box-Type Muffle Furnace is a purpose-engineered laboratory heating system designed for precise, repeatable thermal processing in materials science, metallurgy, ceramics, and quality control laboratories. Unlike conventional muffle furnaces requiring on-site assembly, wiring, and calibration, the SX2-Z operates as a plug-and-play unit—fully pre-assembled with integrated controller, thermocouple, and insulation architecture. Its core operating principle relies on resistive Joule heating via high-stability Fe-Cr-Al alloy spiral heating elements, uniformly distributed around the chamber walls to ensure radial thermal symmetry. The furnace achieves stable setpoint maintenance through closed-loop feedback between the K-type thermocouple (IEC 60584-compliant) and the KSW-series temperature controller, supporting both manual setpoint operation and optional programmable ramp/soak profiles. With a maximum operating temperature of 1300 °C and rated power up to 12 kW, the SX2-Z meets ISO 8573-1 and ASTM E1112 requirements for thermal uniformity testing in Class II laboratory environments.

Key Features

• Integrated design eliminates field installation: no external controller mounting, wiring, or refractory brick alignment required.
• Double-layer thermal insulation system comprising high-purity ceramic fiber (density ≥128 kg/m³) and expanded perlite, minimizing surface temperature rise (<60 °C at ambient +25 °C) and energy consumption.
• Refractory chamber lined with sintered silicon carbide–reinforced alumina bricks (Al₂O₃ ≥92%), resistant to thermal shock and chemical degradation from oxidizing atmospheres.
• Front-loading door with counterbalanced hinge mechanism and high-temperature gasket seal ensures reproducible cavity closure and minimizes heat loss during sample insertion.
• KSW-series analog controller with ±1.5 °C basic accuracy (at 1000 °C), calibrated traceable to NIST-traceable reference standards; optional Fuji PXR3 8-stage programmable controller supports GLP-compliant audit trails and CSV export.
• Over-temperature protection circuit with independent limit switch (cut-off at 1350 °C) and grounded chassis design compliant with IEC 61000-6-3 EMC emission limits.

Sample Compatibility & Compliance

The SX2-Z accommodates crucibles, boats, and trays made from alumina, silicon carbide, quartz, and stainless steel (up to Grade 310S). It is validated for use with ASTM C20, ISO 562, and USP ash content determination protocols. Chamber geometry (80 × 120 × 200 mm internal) supports standard DIN 51062 and ISO 787-18 sample holders. All electrical components meet CE marking requirements under Directive 2014/35/EU (Low Voltage Directive) and 2014/30/EU (EMC Directive). The furnace housing conforms to IP20 ingress protection and complies with laboratory safety standards per ANSI Z21.11.2 for stationary electric heating appliances.

Software & Data Management

While the base model employs analog control, the optional Fuji PXR3 digital controller provides RS-485 Modbus RTU interface for integration into centralized lab data acquisition systems. Firmware supports user-defined profile storage (up to 16 programs), real-time temperature logging (1-second resolution), and timestamped event records—including power-on, setpoint change, alarm activation, and door open/close detection. Data export is compatible with CSV format for post-processing in MATLAB, Python (Pandas), or LIMS platforms. When configured with audit trail enablement, the system satisfies FDA 21 CFR Part 11 requirements for electronic records and signatures in regulated QC environments.

Applications

• Thermal gravimetric analysis (TGA) sample pre-treatment and residue ashing (e.g., ASTM D3174, ISO 1171).
• Sintering of oxide ceramics and ferrites under air atmosphere.
• Heat treatment of metal alloys for microstructural homogenization prior to SEM/EDS analysis.
• Calibration of thermocouples and RTDs using fixed-point reference materials (e.g., Al, Zn, Sn ITS-90 points).
• Combustion of organic matrices in environmental soil and sludge testing (EPA Method 9080).
• Pre-drying of hygroscopic reagents and standards prior to quantitative analysis.

FAQ

What is the typical thermal uniformity across the working zone at 1000 °C?
Measured uniformity is ±8 °C within the central 60% volume (per ASTM E220-19 Annex A2 methodology), verified during factory acceptance testing.
Can the furnace operate continuously at 1300 °C?
Yes—rated for continuous duty at maximum temperature; however, sustained operation above 1200 °C reduces element service life and requires quarterly thermocouple recalibration.
Is nitrogen purging supported?
The standard SX2-Z lacks gas inlet/outlet ports; inert atmosphere operation requires optional flanged front panel modification (part #SX2-Z-GAS-KIT) and external mass flow controller integration.
Does the unit include calibration documentation?
Each shipment includes a Factory Calibration Certificate (traceable to CNAS-accredited lab), listing thermocouple offset values and controller linearity verification at three points (300 °C, 800 °C, 1200 °C).
What maintenance intervals are recommended?
Inspect heating elements and door gasket every 200 operational hours; replace ceramic fiber insulation if compressed >15% thickness or cracked; verify thermocouple drift annually per ISO/IEC 17025 guidelines.