Calibration oven HFL series

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Overview
High-temperature furnaces HFL 16/16 – HFL 160/17 feature a robust lining of lightweight refractory bricks with special backing insulation. Designed for processes that may generate aggressive gases or acids (for example glass melting), they allow maximum temperatures of 1600 °C or 1700 °C depending on the model. The furnace floor is built from lightweight refractory bricks to carry higher charge weights. NTLog Basic for Nabertherm controllers enables process-data recording to USB.

Key features / Function and equipment

• Series HFL: like HT high-temperature furnaces but with a refractory-brick lining for aggressive process conditions.
• Tmax: 1600 °C or 1700 °C (model dependent).
• Heating elements: molybdenum disilicide (MoSi2).
• Robust lightweight refractory-brick insulation with special backing insulation.
• Furnace floor made of lightweight refractory bricks for higher load capacities.
• Application defined within limits of the operating instructions.
• NTLog Basic for process-data recording via USB flash drive.

Additional equipment

• Cooling system to cool the furnace with a defined temperature gradient or with a preset fresh-air volume; both modes switchable segmentwise via controller extra function.
• Thermocouple inlet with screw cap.
• Thermocouples for heating control with calibration certificate.
• Protective-gas connection for purging with non‑flammable process gases (not fully gas-tight).
• Automatic gas supply system with solenoid valve and rotameter, controlled by the controller extra function.
• Lift/parallel-opening door options and automatic door lock including door contact switch.
• Protective guards for heating elements against mechanical damage (optional).
• Ethernet interface.

Gallery captions

• High-temperature furnace HFL 16/17 DB50 with gas supply system.
• HFL 16/17 DB50 with gas supply system (alternative view).
• Automatic gas supply system with solenoid valve and rotameter.
• Thermocouple port in the roof with tripod.
• Lightweight refractory bricks and MoSi2 heating elements.
• Protection of heating elements against mechanical damage during loading/unloading (optional).

Technical specifications (excerpt)
Model | Tmax (°C) | Inner dimensions W x D x H (mm) | Volume (l) | Outer dimensions W x D x H (mm) | Connected load (kW) | Connection | Weight (kg)
HFL 16/16 | 1600 | 200 x 300 x 260 | 16 | 1010 x 890 x 1990 | 12.5 | 3-phase | 530
HFL 40/16 | 1600 | 300 x 350 x 350 | 40 | 1140 x 940 x 2260 | 12.5 | 3-phase | 735
HFL 64/16 | 1600 | 400 x 400 x 400 | 64 | 1240 x 990 x 2310 | 18.5 | 3-phase | 910
HFL 160/16 | 1600 | 500 x 550 x 550 | 160 | 1410 x 1240 x 2490 | 21.5 | 3-phase | 1290
HFL 16/17 | 1700 | 200 x 300 x 260 | 16 | 1010 x 890 x 1990 | 12.5 | 3-phase | 530
HFL 40/17 | 1700 | 300 x 350 x 350 | 40 | 1140 x 940 x 2260 | 12.5 | 3-phase | 735
HFL 64/17 | 1700 | 400 x 400 x 400 | 64 | 1240 x 990 x 2310 | 18.5 | 3-phase | 910
HFL 160/17 | 1700 | 500 x 550 x 550 | 160 | 1410 x 1240 x 2490 | 21.5 | 3-phase | 1290

Notes
Outer dimensions vary when the furnace is equipped with additional equipment. Heating may be performed between two phases for certain variants. The connected load refers to the standard furnace and may increase with added options.

Technical characteristics / Specifications

• Heating technology: molybdenum disilicide (MoSi2) heating elements.
• Insulation: robust lightweight refractory-brick insulation with special backing; related models with fiber insulation are available.
• Furnace floor: lightweight refractory bricks to support higher charge weights.
• Controller/data logging: NTLog Basic for process-data recording via USB.
• Available options: protective-gas purge, automatic gas supply system, calibrated thermocouples, cooling system with controlled gradient, heating-element guards, lift/parallel-opening door, automatic door lock, Ethernet interface.
• Multiple model sizes available; see the technical table for dimensions, volumes, connected loads and weights.