OTF-1200X-M12 Benchtop Open-Type Tube Furnace by Hefei Kejing

Overview

The OTF-1200X-M12 is a compact, open-type horizontal tube furnace engineered for precise thermal processing under controlled atmosphere or vacuum conditions. Designed around a dual-layer stainless steel shell and insulated with high-purity alumina fiber (rated to 1200 °C), the furnace employs a molybdenum-doped Fe–Cr–Al heating element for stable, uniform heat distribution across a 300 mm active heating zone. Its maximum operating temperature of 1000 °C—sustained continuously at 900 °C—makes it suitable for sintering, annealing, oxidation/reduction reactions, thin-film synthesis, and precursor decomposition in materials science, catalysis, and solid-state chemistry laboratories. The furnace operates on standard 220 VAC (50/60 Hz) power and integrates a K-type thermocouple with digital PID feedback control, delivering ±1 °C temperature stability over time and spatially across the heating zone. The modular architecture separates the furnace body from the controller, enabling flexible benchtop integration and minimizing thermal coupling between electronics and hot zones.

Key Features

• Open-frame design with hinged front access for rapid sample loading/unloading and real-time visual monitoring of tube interior
• High-integrity quartz tube (100 mm O.D. × 94 mm I.D. × 650 mm L) compatible with vacuum (down to 10⁻³ mbar with optional vacuum gauge) and inert/reactive gas environments (N₂, Ar, H₂, forming gas)
• Stainless steel flange assembly includes dual-port configuration: one stainless steel stop valve and one gas inlet/outlet port; optional quick-connect flanges and pneumatic baffle valves available for process automation
• 30-segment programmable temperature profile capability with ramp/soak/hold functionality; stored profiles retain settings after power cycling
• Integrated mechanical pressure gauge (–0.1 to +0.15 MPa) and optional PCG-554 cold cathode vacuum gauge (3.8×10⁻⁵ to 1125 Torr) with gas-independent calibration above 10 mbar
• Dual safety interlocks: independent over-temperature cutoff and thermocouple failure detection, compliant with IEC 61000-6-2/6-4 EMC standards
• CE-marked and UL-certified electrical components (>24 V); full TÜV, UL, or CSA certification support available upon request for GxP-regulated facilities

Sample Compatibility & Compliance

The OTF-1200X-M12 accommodates cylindrical samples up to 94 mm in diameter and 600 mm in length, with compatibility extending to crucibles, boats, and substrate holders made from alumina, quartz, or graphite. For vacuum applications, maximum permissible internal pressure is strictly limited to 0.02 MPa (2 bar absolute) to ensure quartz tube integrity. When operating above 1000 °C, the furnace must remain at ambient pressure—vacuum is prohibited due to thermal stress-induced fracture risk. Gas flow rates are constrained to ≤200 SCCM to prevent convective cooling of the hot zone and thermal shock to the quartz tube. All operational parameters align with ASTM E220, ISO/IEC 17025 method validation prerequisites, and GLP-compliant thermal process documentation requirements. Optional data logging modules support 21 CFR Part 11–compliant audit trails when paired with validated PC-based control software.

Software & Data Management

While the standard unit features a standalone 30-stage PID controller with LED display and keypad interface, an optional RS485/USB-enabled temperature module enables bidirectional communication with Windows-based software. This software supports real-time temperature curve visualization, remote profile upload/download, and CSV-formatted data export—including timestamped setpoint, actual temperature, power output, and alarm events. Calibration records, operator ID tagging, and electronic signature fields can be configured to meet FDA 21 CFR Part 11 Annex 11 expectations for regulated laboratories. Firmware updates are delivered via secure HTTPS portal, with version history and checksum verification provided for traceability.

Applications

• Controlled-atmosphere annealing of metal oxides, perovskites, and battery electrode materials (e.g., LiCoO₂, NMC cathodes)
• Carbothermal reduction of metal precursors under Ar/H₂ mixtures
• Growth of 2D materials (e.g., MoS₂, WS₂) via chemical vapor transport (CVT)
• Thermal gravimetric analysis (TGA) pre-treatment and post-synthesis stabilization
• Low-pressure CVD of carbon nanotubes and graphene on catalytic substrates
• Calibration and validation of thermocouples and pyrometers per ISO 17025 Clause 6.5

FAQ

What is the maximum safe operating pressure inside the quartz tube?
The internal pressure must not exceed 0.02 MPa (2 bar absolute) at any time. For vacuum operations, use only certified vacuum-rated quartz tubing and verify seal integrity prior to pump-down.

Can this furnace be used for hydrogen annealing?
Yes—provided the system is purged thoroughly with inert gas before H₂ introduction, flow is regulated below 200 SCCM, and leak testing is performed per ASTM E499. A dedicated H₂-compatible pressure relief valve is recommended.

Is the furnace compatible with automated process control systems?
Yes—via optional Modbus RTU (RS485) or USB-to-serial interface, enabling integration into LabVIEW, Python-based control frameworks, or SCADA platforms with configurable polling intervals and alarm thresholds.

What maintenance is required for long-term accuracy?
Annual verification of thermocouple calibration against a NIST-traceable reference source is advised. Replace ceramic tube plugs every 6 months under continuous operation; inspect quartz tube for devitrification or microcracks before each high-temperature run.

Does the warranty cover vacuum or gas-handling components?
The standard 12-month warranty excludes consumables: quartz tubes, heating elements, seals, and gaskets. Extended service plans covering preventive maintenance and component replacement are available upon request.