KJG OTF-1200X-S Mini Open-End Tube Furnace

Overview

The KJG OTF-1200X-S Mini Open-End Tube Furnace is a compact, CE-certified horizontal tube furnace engineered for precise thermal processing under controlled atmosphere or vacuum conditions. Designed for laboratory-scale synthesis, annealing, sintering, and heat treatment of small-volume samples, it employs resistive heating via Mo-doped Fe-Cr-Al alloy elements embedded in high-purity polycrystalline alumina fiber insulation. The furnace operates on a single-zone configuration with an active heating length of 200 mm and delivers a uniform temperature zone of 60 mm (±1°C at 1000°C), ensuring reproducible thermal profiles critical for materials development and process validation. Its open-end design—featuring two stainless steel vacuum flanges pre-installed with mechanical pressure gauges, stainless steel shut-off valves, and Swagelok-style barbed fittings—enables rapid sample loading/unloading and seamless integration into gas-handling or vacuum systems. The unit complies with EN 61000-6-3 (EMC) and EN 61000-6-4, and all electrical components rated above 24 V meet UL, MET, and CSA safety standards.

Key Features

• Single-zone PID temperature controller with 30-segment programmable ramp/soak profiles for precise thermal protocol execution
• Dual-layer air-cooled outer casing with forced convection cooling to maintain safe external surface temperatures and extend component service life
• High-emissivity, 1750°C-rated alumina coating applied to inner chamber walls to enhance radiant heat reflection, improve thermal efficiency, and inhibit contamination buildup
• Standard 1″ high-purity fused quartz tube (25 mm O.D. × 20 mm I.D. × 450 mm L); optional 2″ tube available for larger samples
• Integrated alumina tube plugs supplied to minimize radiative heat loss; optional fused quartz plugs available for ultra-high-purity applications and improved vacuum integrity
• Robust Mo-doped Fe-Cr-Al heating elements coated with stabilized zirconia to suppress oxidation and ensure long-term stability at elevated temperatures
• Compact footprint (340 × 300 × 400 mm) and lightweight design (18 kg net) optimized for benchtop use in space-constrained laboratories

Sample Compatibility & Compliance

The OTF-1200X-S supports thermal processing of ceramics, metals, thin films, catalysts, battery electrode materials, and nanomaterials under inert (N₂, Ar), reducing (H₂/N₂), or vacuum environments (down to ~10⁻² mbar with optional digital vacuum gauge and dual-stage rotary vane pump). It is compatible with standard KF25 vacuum fittings and accepts stainless steel bellows for enhanced leak integrity. The furnace meets ISO/IEC 17025-relevant environmental control requirements for thermal testing labs and supports GLP-compliant workflows when paired with validated data logging software. All structural and electrical designs adhere to IEC 61010-1 for laboratory equipment safety. Note: Quartz tube operation above 1100°C is not recommended for extended durations; sustained vacuum operation is prohibited above 1000°C per ASTM E1113 guidance on quartz thermal stress limits.

Software & Data Management

Temperature programming and real-time monitoring are performed via the built-in 30-segment PID controller with intuitive front-panel interface and LED display. Optional RS485 communication enables integration with LabVIEW, MATLAB, or custom SCADA platforms for automated data acquisition. When used with third-party compliant data loggers, the system supports audit-trail generation and electronic signature functionality aligned with FDA 21 CFR Part 11 principles for regulated environments. Calibration certificates traceable to NIST standards are available upon request for metrological verification.

Applications

• Low-volume ceramic sintering and densification studies
• Graphene and CNT growth via chemical vapor deposition (CVD)
• Electrode material calcination for Li-ion and solid-state batteries
• Thermal annealing of thin-film photovoltaic devices
• Controlled-atmosphere reduction of metal oxides
• Pre-sintering of 3D-printed metal green bodies
• Thermogravimetric analysis (TGA) support under static or flowing gas

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. A pressure relief valve must be installed if overpressure risk exists.

Can the furnace operate continuously at 1200°C?

No. 1200°C is rated for ≤1 hour; continuous operation is limited to 1100°C to preserve heating element and insulation integrity.

Is vacuum operation permitted above 1000°C?

No. Vacuum must be vented to atmospheric pressure before exceeding 1000°C to prevent quartz tube deformation or fracture due to thermal stress.

What gas flow rate is recommended during heating?

Total inlet flow should remain below 200 SCCM to avoid thermal shock to the quartz tube from cold gas influx.

Are consumables covered under warranty?

Quartz tubes, silicone O-rings, and heating elements are excluded from the 12-month limited warranty as normal wear items.