Brazing oven NA series

annealingtemperingheat treatment

Overview
The very good temperature uniformity of these chamber furnaces with air circulation provides ideal process conditions for annealing, curing, solution annealing, artificial ageing, sintering of PTFE, preheating, soft annealing and brazing. The forced convection chamber furnaces are equipped with a suitable annealing box for soft annealing of copper or tempering of titanium, and also for annealing of steel under non-flammable process gases. The modular design allows adaptation to specific process requirements with appropriate accessories.

Main features

• Tmax 450 °C, 650 °C, or 850 °C
• Horizontal air circulation with optimum distribution through stainless steel baffles
• Swing door hinged on the right side
• Base frame included in the delivery
• Temperature uniformity up to +/− 4 °C according to DIN 17052-1
• Optimum air distribution enabled by high flow speeds
• Multi-part bottom support included in the delivery
• Over-temperature limiter with adjustable cutout temperature to protect furnace and load
• Exclusive use of insulation materials without classification according to EC Regulation No 1272/2008 (CLP) — no refractory ceramic fiber (RCF)
• Defined application within the constraints of the operating instructions
• Controller with touch operation B500 (5 programs with 4 segments each)
• Automatic switch-off of air circulating fan for two minutes after door opening
• Side port and additional 3 mm thermocouple entry port
• NTLog Basic for controller: recording of process data with USB flash drive
• Freeware NTEdit for convenient program input via Excel on PC
• Freeware NTGraph for evaluation and documentation of firings using Excel on PC
• MyNabertherm App for online monitoring of the firing on mobile devices (free download)

Technical specifications (excerpt)
Model | Tmax (°C) | Inner W (mm) | Inner D (mm) | Inner H (mm) | Volume (l) | Outer W (mm) | Outer D (mm) | Outer H (mm) | Heating power (kW) | Electrical connection | Weight (kg) | Heat-up time to Tmax (min) | Cool-down to 150 °C (Flaps) (min) | Cool-down to 150 °C (Fan cooling) (min)
NA 120/45 | 450 | 450 | 600 | 450 | 120 | 1075 | 1475 | 1500 | 9 | 3-phase | 280 | 60 | 90 | 30
NA 250/45 | 450 | 600 | 750 | 600 | 250 | 1250 | 1660 | 1670 | 12 | 3-phase | 650 | 60 | 120 | 30
NA 500/45 | 450 | 750 | 1000 | 750 | 500 | 1400 | 1910 | 1810 | 18 | 3-phase | 800 | 90 | 240 | 45
NA 60/65 | 650 | 350 | 500 | 350 | 60 | 930 | 1310 | 1435 | 9 | 3-phase | 240 | 90 | 210 | 30
NA 120/65 | 650 | 450 | 600 | 450 | 120 | 1030 | 1410 | 1535 | 12 | 3-phase | 280 | 90 | 240 | 60
NA 250/65 | 650 | 600 | 750 | 600 | 250 | 1250 | 1700 | 1750 | 20 | 3-phase | 650 | 90 | 480 | 60
NA 500/65 | 650 | 750 | 1000 | 750 | 500 | 1400 | 1950 | 1810 | 27 | 3-phase | 850 | 90 | 600 | 90
NA 60/85 | 850 | 350 | 500 | 350 | 60 | 930 | 1310 | 1435 | 9 | 3-phase | 240 | 150 | 900 | 120
NA 120/85 | 850 | 450 | 600 | 450 | 120 | 1030 | 1410 | 1535 | 12 | 3-phase | 390 | 150 | 900 | 120
NA 250/85 | 850 | 600 | 750 | 600 | 250 | 1260 | 1700 | 1810 | 20 | 3-phase | 840 | 180 | 900 | 180
NA 500/85 | 850 | 750 | 1000 | 750 | 500 | 1410 | 1950 | 1960 | 27 | 3-phase | 1150 | 180 | 900 | 210
NA 675/85 | 850 | 750 | 1200 | 750 | 675 | 1410 | 2150 | 1960 | 30 | 3-phase | 1360 | 210 | 900 | 210

Notes
External dimensions vary when furnace is equipped with additional equipment. Depending on furnace design connected load might be higher. Approx. information is given for empty furnace. Additional equipment influences some parameters.