KeHeng SX-2.5-12T Integrated Benchtop Muffle Furnace

Overview

The KeHeng SX-2.5-12T is an integrated benchtop muffle furnace engineered for precise, repeatable high-temperature thermal processing in academic, industrial quality control, and R&D laboratories. Unlike conventional split-unit designs, this model features a fully integrated architecture—housing the heating chamber, insulation assembly, temperature controller, and power regulation circuitry within a single compact enclosure. This integration eliminates signal loss across external cable connections, reduces thermal drift during extended dwell cycles, and improves spatial temperature uniformity across the working zone. The furnace operates on resistive heating principles, utilizing Fe-Cr-Al alloy resistance wire wound around high-purity alumina fiber insulation to achieve stable operation up to 1200 °C. Its muffle configuration isolates samples from combustion byproducts and heating element emissions, ensuring contamination-free thermal treatment essential for ashing, calcination, sintering, and heat-treatment validation protocols.

Key Features

• Integrated controller-chamber design with front-panel digital PID temperature controller featuring ramp-soak programming and real-time temperature display
• High-density ceramic fiber insulation (≥1260 °C rated) providing rapid heat-up rates and low external surface temperature (<60 °C at max operating temperature)
• Robust double-layer stainless steel housing with reinforced door seal and counterbalanced hinge mechanism for long-term dimensional stability
• Over-temperature protection via independent mechanical limit switch (cut-off at 1250 °C) and software-based thermal runaway detection
• Front-loading chamber with refractory brick-lined floor and removable muffle tube for easy cleaning and sample access
• Compliance-ready design supporting traceable calibration documentation and optional NIST-traceable temperature mapping reports

Sample Compatibility & Compliance

The SX-2.5-12T accommodates standard crucibles (up to Φ60 mm × 40 mm height), porcelain boats, and quartz or alumina sample holders. Its sealed muffle environment meets ASTM E1112 and ISO 7888 requirements for gravimetric ash content determination in pharmaceutical excipients, foodstuffs, and polymer composites. The furnace supports GLP-compliant workflows through configurable data logging intervals (1–60 s), user-accessible calibration offset adjustment, and audit trail-capable firmware (when paired with KeHeng’s optional LabLink Pro software). While not certified for FDA 21 CFR Part 11 out-of-the-box, its hardware architecture permits third-party validation for GMP environments requiring electronic record integrity.

Software & Data Management

The embedded controller supports USB-based data export of time-temperature profiles in CSV format. Optional LabLink Pro software (v3.2+) enables remote monitoring via Ethernet or Wi-Fi, automated report generation (PDF/Excel), and multi-furnace fleet management. All logged datasets include timestamp, operator ID, setpoint history, and actual chamber temperature readings—structured to align with ISO/IEC 17025 clause 7.7 on measurement traceability. Firmware updates are delivered via signed binary packages with SHA-256 checksum verification to ensure integrity during field deployment.

Applications

• Residue-on-ignition (ROI) and total ash analysis per USP , EP 2.4.15, and AOAC 942.05
• Pre-treatment of catalyst supports and ceramic green bodies prior to sintering
• Thermal decomposition studies of flame-retardant additives in polymer matrices
• Calibration verification of thermocouples (Type S, R, B) using fixed-point reference materials
• Controlled oxidation of metal powders for stoichiometric oxide synthesis
• Validation of sterilization cycle parameters in medical device packaging development

FAQ

What thermocouple type is used for internal temperature sensing?
The furnace employs a grounded Type K thermocouple mounted in direct contact with the muffle wall near the geometric center of the chamber.
Is the chamber atmosphere controllable (e.g., inert gas purging)?
Yes—the unit includes dual 6-mm BSP threaded ports (inlet and outlet) compatible with standard gas regulators and flow meters for nitrogen or argon purging.
Can the controller store multiple temperature programs?
It supports up to 16 user-defined ramp-soak programs, each with up to 8 segments, stored non-volatile memory.
What is the typical time-to-temperature for 1000 °C from ambient?
Approximately 38 minutes under no-load conditions, verified per IEC 60068-2-2 test methodology.
Does the furnace comply with CE electromagnetic compatibility directives?
Yes—it meets EN 61326-1:2013 for laboratory equipment and carries the CE marking for EMC and LVD conformity.