Nabertherm RT Series Compact Horizontal/Vertical Tube Furnace

Overview

The Nabertherm RT Series is a precision-engineered compact tube furnace designed for controlled thermal processing in research laboratories and pilot-scale production environments. Operating on resistive heating principles with high-density ceramic fiber insulation and a robust C 530 alumina ceramic tube, the RT furnace delivers stable, repeatable temperature profiles across its defined heating zone. Its modular mechanical architecture supports operation in horizontal, vertical, or adjustable angular configurations—enabling integration with gas supply systems, vacuum manifolds, or in-line sample handling modules. Unlike conventional muffle furnaces, the RT series prioritizes directional flexibility and spatial adaptability without compromising thermal homogeneity or process repeatability. The furnace complies with IEC 61000-6-3 (EMC) and IEC 61000-6-4 emission standards, and its electrical safety design conforms to EN 61000-1-2 and EN 60519-1 for industrial electroheating equipment.

Key Features

• Three standard temperature classes: 1100 °C (RT 50-250/11), 1300 °C (RT 50-250/13), and 1500 °C (RT 30-200/15), each validated per DIN EN 60519-1 thermal stability requirements
• Adjustable mounting orientation: fully rotatable support frame permits precise alignment from −90° (vertical downward) to +90° (vertical upward), with fine-height adjustment via calibrated threaded feet
• Ceramic tube constructed from C 530—a high-purity (>99.7% Al₂O₃), low-alkali alumina formulation offering exceptional thermal shock resistance and minimal outgassing below 10⁻⁶ mbar
• Integrated Type S thermocouple (Pt–10% Rh / Pt) mounted in direct contact with the tube wall, certified to ASTM E230 Class 1 tolerance (±1.5 °C or ±0.25% of reading, whichever is greater)
• Compact footprint (as small as 350 × 380 × 740 mm) facilitates benchtop integration or placement within fume hoods and glovebox interfaces
• Controller housing located beneath the furnace body to minimize heat exposure to electronics; compatible with Nabertherm’s THERMOCOMFORT or THERMOCONTROL TC 1600 programmable controllers (sold separately)

Sample Compatibility & Compliance

The RT furnace accommodates cylindrical samples up to 250 mm in length and 50 mm in outer diameter (model-dependent). Its C 530 tube ensures compatibility with inert, reducing, oxidizing, and mild vacuum atmospheres (down to 10⁻² mbar with optional sealing kits). When operated with Nabertherm’s standardized gas/vacuum feedthroughs (e.g., RHTC-series adapters), the system meets ISO 8573-1:2010 Class 4 purity requirements for compressed air and supports GLP-compliant process documentation when paired with FDA 21 CFR Part 11–enabled controllers. The furnace structure adheres to DIN 12880 for laboratory heating equipment and carries CE marking under the EU Machinery Directive 2006/42/EC and Low Voltage Directive 2014/35/EU.

Software & Data Management

While the base RT furnace operates with analog or basic digital controllers, full data traceability is achieved using Nabertherm’s THERMOCONTROL TC 1600 or TC 2000 series. These controllers provide multi-segment ramp-soak programming, real-time graphing, CSV export, and audit-trail logging compliant with ISO/IEC 17025 and GMP Annex 11 requirements. Optional Ethernet or RS485 interfaces enable integration into LabVantage, DeltaV, or custom SCADA platforms. All controller firmware undergoes annual calibration verification per ISO/IEC 17025-accredited procedures, and raw thermocouple signal outputs are accessible for third-party DAQ validation.

Applications

• Thermal annealing of thin-film metal oxides (e.g., TiO₂, NiO) in controlled O₂/N₂ atmospheres
• Pre-sintering of ceramic green bodies prior to HIP or pressureless sintering
• Controlled pyrolysis of polymer-derived ceramics under argon sweep
• Calibration of thermocouples and reference materials per ASTM E220 and ISO 5725
• Inert-atmosphere heat treatment of battery cathode precursors (e.g., LiCoO₂, NMC)
• Low-pressure chemical vapor deposition (LPCVD) precursor decomposition studies

FAQ

Can the RT furnace be operated vertically without additional structural reinforcement?
Yes—the support frame is statically rated for full-load vertical operation at all specified maximum temperatures. Load capacity remains unchanged regardless of orientation.
Is the C 530 tube resistant to HF or chlorine-containing atmospheres?
No. C 530 alumina exhibits limited resistance to halogen acids and fluorine-based gases. For such chemistries, quartz or SiC tubes (available as optional accessories) are recommended.
What is the typical warm-up time to 1000 °C in horizontal configuration?
Approximately 45–55 minutes, depending on ambient conditions and thermal mass of inserted fixtures. Ramp rates are programmable between 0.1 and 20 °C/min.
Does the furnace include overtemperature protection independent of the main controller?
Yes—a redundant bimetallic safety cut-off (set 50 °C above max operating temperature) is hardwired in series with the heating circuit per EN 60519-1 Clause 5.3.2.
Are replacement tubes and thermocouples available as genuine Nabertherm spare parts?
Yes. All consumables—including C 530 tubes, Type S thermocouples, and insulation sleeves—are stocked globally under Nabertherm part numbers and supplied with material certificates (EN 10204 3.1).