KJ GROUP OTF-1200X-II-HVHP-80 Dual-Zone High-Pressure Tube Furnace (up to 800 °C, 7 bar)

Overview

The KJ GROUP OTF-1200X-II-HVHP-80 is a dual-zone, high-pressure tube furnace engineered for controlled thermal processing under elevated gas pressures—up to 7 bar (105 PSI) at 800 °C. Designed for materials synthesis, solid-state reaction studies, and high-pressure annealing in reactive or inert atmospheres, the system operates on the principle of resistive heating within a sealed, corrosion-resistant SS310S alloy tube. Its dual independent temperature zones enable precise axial thermal gradients—critical for crystal growth, diffusion-controlled phase transformations, and multi-step thermochemical treatments. The furnace integrates robust mechanical design (double-walled shell with forced-air circulation), advanced process safety architecture (real-time pressure transduction, dual-threshold audible/visual alarms, automatic cut-off), and compliance-grade control logic—making it suitable for use in ISO 17025-accredited laboratories, university research facilities, and industrial R&D environments requiring reproducible high-pressure thermal protocols.

Key Features

• Dual independent heating zones (2 × 200 mm active length), each with dedicated PID controller supporting up to 30 programmable ramp-hold segments
• SS310S seamless nickel-based alloy tube (Ø80 mm OD / Ø72 mm ID / 1000 mm L) rated for sustained operation at 800 °C and 7 bar internal pressure
• Double-shell construction with integrated axial fan cooling and aluminum finned heat sinks—ensuring external shell surface temperature remains below 55 °C and flange temperature <100 °C during continuous operation
• High-emissivity American-sourced alumina coating applied to interior furnace chamber walls, enhancing radiative heat transfer efficiency and mitigating thermal degradation over extended service life
• Integrated pressure transducer mounted directly on the CF-63 flange, delivering real-time digital readout via front-panel LED display with configurable alarm thresholds
• Comprehensive safety suite: overtemperature cutoff, thermocouple failure detection, pressure deviation alarm (user-defined upper/lower limits), and automatic power interlock upon threshold breach
• CE-marked design validated per EN 61000-6-3 (EMC) and EN 61000-6-4 (immunity), with electrical insulation and grounding conforming to IEC 61000-4-5 surge immunity requirements

Sample Compatibility & Compliance

The OTF-1200X-II-HVHP-80 accommodates cylindrical samples up to Ø70 mm in diameter and 1000 mm in length, compatible with standard ceramic crucibles (Al₂O₃, SiC), quartz boats, and metal containment vessels rated for equivalent pressure–temperature conditions. It supports atmosphere-controlled processing—including N₂, Ar, H₂, O₂, and forming gas mixtures—at pressures ranging from high vacuum (10⁻⁵ torr, when paired with turbo-molecular pumping) to 7 bar absolute. The system meets essential requirements for GLP-compliant thermal treatment documentation: all temperature and pressure setpoints, actual values, and alarm events are timestamped and retained in non-volatile memory. While not pre-certified to FDA 21 CFR Part 11, its data logging architecture supports audit-trail implementation via external SCADA integration or third-party validation packages.

Software & Data Management

The furnace utilizes an embedded PID controller with local HMI interface; no proprietary software is required for basic operation. However, RS485 Modbus RTU communication port enables integration into centralized lab automation platforms (e.g., LabVIEW, Ignition SCADA, or custom Python-based DAQ systems). All temperature profiles, pressure logs, and fault records can be exported as CSV files via USB flash drive. For traceability-critical applications, optional firmware upgrades support time-stamped event logging with checksum-verified storage—aligning with ISO/IEC 17025 clause 7.7.1 (data integrity) and ASTM E2500-13 (verification of automated systems).

Applications

• Synthesis of metastable oxides and nitrides under controlled p–T conditions
• High-pressure sintering of ceramic composites and battery electrode materials
• Thermal annealing of thin-film heterostructures under oxidizing or reducing ambients
• Decomposition kinetics studies of energetic compounds and MOFs
• In situ calibration of high-temperature pressure sensors and thermocouples
• Pre-treatment of catalyst supports prior to catalytic testing in fixed-bed reactors

FAQ

What is the maximum allowable pressure at 750 °C?
At 750 °C, the recommended maximum operating pressure is 150 PSI (10.3 bar), interpolated between the certified limits of 21 bar at 700 °C and 7 bar at 800 °C.
Can this furnace be used under hydrogen atmosphere?
Yes—provided appropriate leak-checking procedures are followed, H₂-compatible seals (e.g., metal-CF gaskets) are installed, and the system is purged per NFPA 55 and CGA G-5.5 guidelines prior to pressurization.
Is vacuum compatibility verified with molecular pumps?
Yes—the furnace achieves ≤10⁻⁵ torr base pressure when coupled with a certified turbo-molecular pump station and calibrated capacitance manometer.
Does the controller support remote monitoring via Ethernet?
No native Ethernet port is included; however, RS485-to-Ethernet gateways (e.g., Moxa NPort series) enable secure TCP/IP access for supervisory control and data acquisition.
Are replacement SS310S tubes available as spare parts?
Yes—KJ GROUP supplies OEM-specification SS310S tubes (Ø80 × Ø72 × 1000 mm) with full mill test reports (MTRs) and ASME Section II material certification.