Zhuochi SXL-1616 Programmable Box-Type Muffle Furnace

Overview

The Zhuochi SXL-1616 Programmable Box-Type Muffle Furnace is a precision-engineered high-temperature thermal processing instrument designed for controlled atmosphere-free heating applications in research laboratories, materials science departments, and quality control environments. It operates on the principle of resistive heating via silicon molybdenum (MoSi₂) heating elements embedded within a multi-layered, low-thermal-conductivity ceramic fiber insulation system—enabling rapid heat-up, stable temperature uniformity, and energy-efficient operation up to 1600 °C. Unlike conventional resistance-wire furnaces, the MoSi₂ element offers superior oxidation resistance in air, extended service life at elevated temperatures, and minimal drift during prolonged dwell cycles. The furnace’s fully enclosed muffle design isolates samples from direct contact with heating elements and combustion byproducts, ensuring contamination-free thermal treatment essential for metallurgical annealing, ceramic sintering, ash content determination (per ASTM E1755), and high-purity sample preparation.

Key Features

• 30-segment programmable temperature controller enabling precise ramp-hold-cool profiles, including adjustable heating rates (0.1–30 °C/min), multi-step isothermal holds, and automatic shutdown logic.
• Robust construction with electrophoretically coated matte-finish steel exterior and 304 stainless steel inner chamber lining and door seal surface—resistant to thermal cycling fatigue and chemical exposure.
• Lightweight refractory ceramic fiber insulation (density ~128 kg/m³) reduces thermal mass and improves energy efficiency while maintaining structural integrity at 1600 °C.
• Dual independent over-temperature protection circuits: primary limit switch (setpoint +15 °C) and secondary independent thermocouple-based cut-off (setpoint +25 °C), compliant with IEC 61000-6-2 EMC immunity requirements.
• Integrated earth leakage circuit breaker (30 mA sensitivity) and reinforced grounding system meeting EN 61010-1 safety standards for laboratory electrical equipment.

Sample Compatibility & Compliance

The SXL-1616 accommodates crucibles, boats, and sample holders made from alumina, silicon carbide, platinum, or quartz—compatible with inert, oxidizing, and mildly reducing atmospheres (when used with optional gas purge ports). Its chamber geometry (200 × 150 × 150 mm) supports standard ASTM/ISO sample containers and enables uniform thermal distribution across typical analytical sample masses (up to 200 g). The furnace conforms to key regulatory frameworks applicable to thermal analysis instrumentation, including ISO/IEC 17025 calibration traceability pathways, USP heavy metals testing protocols, and GLP-compliant thermal validation requirements. Temperature uniformity across the working zone is maintained within ±5 °C at 1600 °C (measured per ASTM E220 methodology using calibrated Type S thermocouples).

Software & Data Management

An optional RS485/USB interface enables bidirectional communication with PC-based monitoring software (Windows-compatible, no proprietary runtime required). The software supports real-time temperature logging at user-defined intervals (1–60 s), export of CSV-formatted time-series data, graphical overlay of multiple runs, and generation of audit-ready reports compliant with FDA 21 CFR Part 11 requirements—including electronic signatures, user access levels, and immutable audit trails. All firmware updates are delivered via signed HEX files to ensure integrity and version control.

Applications

• Heat treatment of small-scale ferrous and non-ferrous alloys (annealing, tempering, solution treatment)
• Sintering of advanced ceramics (Al₂O₃, ZrO₂, SiC) and powder metallurgy compacts
• Thermogravimetric pre-treatment prior to XRD or SEM-EDS analysis
• Ash residue quantification in environmental, food, and pharmaceutical matrices (AOAC 942.05, ISO 2171)
• Calibration of high-temperature reference materials and thermocouple verification
• Pre-firing of catalyst supports and sensor substrates under controlled oxidative conditions

FAQ

What type of thermocouple is used for temperature sensing and control?
A dual-calibrated Type S (Platinum/Rhodium) thermocouple is factory-installed for both control and over-temperature protection—traceable to NIST standards with annual recalibration recommended.
Is the furnace suitable for use under inert gas or vacuum conditions?
The base configuration is rated for ambient air operation only; optional flanged ports and quartz-glass viewport kits are available for nitrogen/argon purging—vacuum operation requires custom modification and is not supported out-of-the-box.
How is temperature uniformity validated across the chamber?
Uniformity mapping is performed during factory acceptance testing using nine-point grid measurements per ASTM E220 Annex A2; a certificate of uniformity (±5 °C at 1600 °C) is supplied with each unit.
Can the controller store multiple programs for different material protocols?
Yes—the internal memory retains up to 16 user-defined programs, each with 30 segments, and supports password-protected parameter locking for SOP compliance.
What maintenance intervals are recommended for long-term reliability?
Visual inspection of MoSi₂ rods and ceramic fiber integrity every 200 operating hours; full thermocouple recalibration and insulation density check every 12 months or 1,000 h—whichever occurs first.