Forced Convection Chamber Furnaces Electrically Heated

Optimum air distribution enabled by high flow speeds.

Function and equipment

NA120_45
NA250_45
NAT15_85_.png
NA30_65_
NA_Thermoelementdurchfuehrung
NA_Einlegeblech
Rollengang

Due to their very good temperature uniformity, these forced convection chamber furnaces with air circulation are suitable for processes such as stress relieving, artificial aging, and cooling glass as well as pre-heating glass molds. To burn in release agents in glass molds, to burn in organic pastes or to sterilize laboratory glassware, the forced convection chamber furnaces are equipped with the corresponding passive safety concepts. The modular design of the forced convection chamber furnaces allows them to be adapted with appropriate accessories to suit process requirements.

  • Tmax 450 °C, 650 °C, or 850 °C
  • Dual shell housing made of textured stainless steel sheets with additional fan cooling for low surface temperature
  • Horizontal air circulation with optimum distribution through stainless steel baffles
  • Swing door hinged on the right
  • Exclusive use of insulation materials without categorization according to EC Regulation No 1272/2008 (CLP). This explicitly means that alumino silicate wool, also known as “refractory ceramic fiber” (RCF), which is classified and possibly carcinogenic, is not used.
  • Temperature uniformity up to +/− 4 °C according to DIN 17052-1 (NAT 15/65 up to +/− 5 °C, NAT ../85 up to +/− 6 °C) in the empty work space
  • One frame sheet and rails for two additional trays included in the scope of delivery (Models NAT .. without frame sheet)
  • Base frame included in the delivery, models NAT .. designed as table-top model
  • Defined application within the constraints of the operating instructions
  • NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive
  • Controller B400/B410 (5 programs with each 4 segments)

Process Control and Documentation

As one of the world's largest furnace manufacturers, Nabertherm has many years of experience in the design and manufacture of standardized and customer-specific control systems. All controls are characterized by a very high level of operating convenience and even the basic version has extensive basic functions. Depending on the requirements, the functions can be expanded and adapted to your needs. Professional software solutions for single or multiple furnace management as well as process and batch documentation based on our Nabertherm controllers complete the range. 

Also for compliance with industry-specific standards that define process control and documentation, such as for example, the AMS2750F for aviation, the CQI-9 in the automotive industry or the FDA in the pharmaceutical industry we offer standardized solutions.

Additional equipment

Additional Equipment (not for Models NAT ..)

  • Optimization of the temperature uniformity up to +/− 3 °C according to DIN 17052-1 in the empty work space
  • Air inlet and exhaust air flaps when used for drying
  • Controlled cooling with Controller P470, for example, to relieve stresses in glass at low cooling rates (optional: PLC with controlled cooling and optimized control accuracy for cooling rates as low as 0.2 °C per hour)
  • Manual lift door (up to model NA 120/..)
  • Electro-hydraulic/pneumatic lift door
  • Air circulation with speed control, recommendable for processes with light or sensitive charge
  • Additional frame sheet
  • Gas supply boxes different charging methods
  • Feed and charging aids
  • Safety technology according to EN 1539 (models NA .. LS) for charges containing solvents
  • Furnaces in DB design with fresh air preheating, exhaust gas fan, and extensive safety package for processes with low evaporation rates of organic material
  • Inlets, measuring frames and thermocouples for TUS measurements charge or comparative measurements
  • Charge control with documentation of the charge thermocouple
  • Process control and documentation via VCD software package or Nabertherm Control Center (NCC) for monitoring, documentation and control

Technical specifications

Model Tmax Inner dimensions in mm Volume Outer dimensions3 in mm Heating power in kW4 Electrical Weight
  in °C w d h in l W D H NA NA .. LS connection in kg
NA 120/45 (LS) 450 450 600 450 120 1250 1550 1550 9.0 18.0 3-phase 460
NA 250/45 (LS) 450 600 750 600 250 1350 1650 1680 12.0 24.0 3-phase 590
NA 500/45 (LS) 450 750 1000 750 500 1550 1900 1820 18.0 24.0 3-phase 750
                       
NAT 15/651 650 295 340 170 15 470 790 460 2.8 1-phase 60
NA 60/65 650 350 500 350 60 910 1390 1475 9.0 3-phase 450
NA 120/65 650 450 600 450 120 990 1470 1550 12.0 3-phase 520
NA 250/65 650 600 750 600 250 1170 1650 1680 20.0 3-phase 730
NA 500/65 650 750 1000 750 500 1290 1890 1825 27.0 3-phase 950
                       
NAT 15/851 850 320 320 150 15 690 880 570 3.0 1-phase 85
NAT 30/851 850 320 320 300 30 690 880 720 3.0 1-phase 100
NAT 50/851 850 400 320 400 50 770 880 820 4.5 3-phase 130
NA 60/85 850 350 500 350 60 790 1330 1440 9.0 3-phase 315
NA 120/85 850 450 600 450 120 890 1420 1540 12.0 3-phase 390
NA 250/85 850 600 750 600 250 1120 1690 1810 20.0 3-phase 840
NA 500/85 850 750 1000 750 500 1270 1940 1960 30.0 3-phase 1150
NA 675/85 850 750 1200 750 675 1270 2190 1960 30.0 3-phase 1360
1Table-top model
2Heating only between two phases
3External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.
4Depending on furnace design connected load might be higher

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Customer Test Center

What furnace is the right choice for this specific process? This question cannot always be answered easily. Therefore, we have set up our modern test center which is unique in respect to size and variety. A representative number of furnaces is available for tests for our customers.