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Inert Atmosphere
Bench Furnaces

Bench furnace picture

BULLETIN
BF-720

INERT
ATMOSPHERE
ELECTRIC
HEAT TREATING
FURNACES


 

Grieve standard Inert Atmosphere Bench Furnaces are specifically designed for heat treating applications requiring inert atmosphere protection. Inert atmospheres protect the work from oxidation even while being subjected to high temperatures. Five sizes to 2.0 cubic feet with temperatures to 2200°F. Precision microprocessor based temperature controls and energy-saving insulation maximize the cost efficiency and performance of these rugged units. Ideal for heat treating of tools, dies and other parts.

STANDARD FEATURES Back to Top
Controls
—Digital, microprocessor based, thermocouple actuated, indicating temperature controller
—On-off heat switch
—LED pilot lights



Safety Equipment — Electric Furnace
—Adjustable, thermocouple actuated, manual reset excess temperature interlock
—Separate heating element control contactor
—Door interlock switch turns off power to heating elements when door is opened; restores    power when door is closed



Construction
—Heavy gauge continuously welded aluminized steel cabinet for atmosphere tightness
—Brushed stainless steel control panel face
—High temperature ceramic fiber resilient door gasket to contain atmosphere
—Heat resistant alloy atmosphere inlet and outlet
—Gas spring assisted manually operated vertical lift door
—Door hot side faces away from operator at all times
—High temperature alloy wire heating elements supported by rugged ceramic plates
—Energy-saving lightweight ceramic fiber insulation reduces operating costs
—Fast heat-up
—Heating elements located on sidewalls and roof for excellent temperature uniformity
   throughout work space
—Ceramic hearth tray
—1 year limited warranty


All equipment fully assembled and individually factory tested

 

   
SPECIFICATIONS Back to Top
NOT FOR USE WITH FLAMMABLE SOLVENTS, VAPORS OR GASES
Model
Work Space
Outside
Dimensions
(WxDxH)
Max
Temp*
Insu-
lation
Height
w/Door
Open
Heat Input
KW
Operating Characteristics†
Approx
Shipping
Weight
Dimensions
(WxDxH)
Volume
Cu Ft
230V
460V
Control
Accuracy
Furnace
Uniformity
Rise Time
230V 460V
BAF-8128 8" x 12" x 8" 0.44 24" x 31" x 31" 2000°F 5" 52" 4.5 6 ± 0.3% ±15°F 65 min 50 min 420 lbs
BAF-8128-HT 8" x 12" x 8" 0.44 26" x 33" x 33" 2200°F 6" 54" 4.5 6 ± 0.3% ±20°F 75 min 55 min 505 lbs
BAF-12128 12" x 12" x 8" 0.67 28" x 31" x 31" 2000°F 5" 52" 6 8 ± 0.3% ±15°F 55 min 45 min 470 lbs
BAF-12128-HT 12" x 12" x 8" 0.67 30" x 33" x 33" 2200°F 6" 54" 6 8 ± 0.3% ±20°F 80 min 60 min 550 lbs
BAF-121212 12" x 12" x 12" 1.0 28" x 31" x 37" 2000°F 5" 66" 7.5 10 ± 0.3% ±12°F 50 min 40 min 520 lbs
BAF-121212-HT 12" x 12" x 12" 1.0 30" x 33" x 39" 2200°F 6" 68" 7.5 10 ± 0.3% ±17°F 65 min 50 min 620 lbs
BAF-12188 12" x 18" x 8" 1.0 28" x 37" x 31" 2000°F 5" 52" 7.5 10 ± 0.3% ±10°F 65 min 50 min 545 lbs
BAF-12188-HT 12" x 18" x 8" 1.0 30" x 39" x 33" 2200°F 6" 54" 7.5 10 ± 0.3% ±15°F 75 min 55 min 645 lbs
BAF-121812 12" x 18" x 12" 1.5 28" x 37" x 37" 2000°F 5" 66" 12 16 ± 0.3% ±10°F 45 min 35 min 570 lbs
BAF-121812-HT 12" x 18" x 12" 1.5 30" x 39" x 39" 2200°F 6" 68" 12 16 ± 0.3% ±15°F 60 min 45 min 675 lbs
BAF-12248 12" x 24" x 8" 1.33 28" x 43" x 31" 2000°F 5" 52" 12 16 ± 0.3% ±10°F 50 min 40 min 680 lbs
BAF-12248-HT 12" x 24" x 8" 1.33 30" x 45" x 33" 2200°F 6" 54" 12 16 ± 0.3% ±15°F 60 min 45 min 755 lbs
BAF-122412 12" x 24" x 12" 2.0 28" x 43" x 37" 2000°F 5" 66" 15 20 ± 0.3% ±10°F 45 min 35 min 775 lbs
BAF-122412-HT 12" x 24" x 12" 2.0 30" x 45" x 39" 2200°F 6" 68" 15 20 ± 0.3% ±15°F 60 min 45 min 850 lbs
*1950°F for continuous operation under Nitrogen atmosphere. For
operation at higher temperatures, furnace must be periodically run with
air atmosphere to buildup protective oxide coating on heating elements.
  †Accuracy as percent of controller span. Uniformity at 100°F below maximum temperature. Rise Time in minutes to 100°F below maximum temperature. Tests run with empty oven and minimum exhaust. Performance will vary with load, exhaust rate and application. See Bulletin TC-920 for additional details.
STANDARD EQUIPMENT   Back to Top
All Models
— 208 volts, 3-phase, 60 Hz
— 230 volts, 3-phase, 60 Hz
— 460 volts, 3-phase, 60 Hz
— Other electrical characteristics available

Each furnace features completely wired control panel, located under the furnace, enclosing terminals for incoming power, temperature controller, heating element control contactor, excess temperature controller, separate contactor interlocked with excess temperature controller, 115 volt control circuit transformer, on-off heat switch and red pilot light. Door interlock switch turns off power to heating elements when door is opened. High temperature enamel painted aluminized steel exterior.
Ceramic hearth tray rated for 60 lbs distributed loading. Atmosphere inlet (1/2" NPT) at side of work space and atmosphere outlet (3/4" NPT) through the top at back. Sealed rear terminal box with vent petcock.




Circulation Diagram

                     Cross section through work space
                     (Front View)

 
ADDITIONAL EQUIPMENT AVAILABLE Back to Top

See Bulletin TC-960 for modifications and other optional equipment.

Floor Stand, 26" High, heavy duty steel cabinet with shelf
Option FS


Programmable Temperature Controller, microprocessor based, digital indicating, thermocouple actuated, in lieu of standard controller
Option PTC


Recording Thermometer, thermocouple actuated, 24-hour, 10" diameter circular chart, used in conjunction with standard controller, includes floor stand to house recorder. Floor stand cannot be used for storage
Option RT


Digital Timing Temperature Controller, microprocessor based, digital indicating, incorperates 99 hour 59 minute timer. Starts timing when temperature reaches set point and shuts down oven at end of set time
Option DTS3

Digital Shut Down Timer, with continuous "hold" feature
Option SDT


Digital Batch Timer, for uniformly timing batch operations. Continuous alarm with door interlock; alarm at end of preset time period until door is opened or timer reset
Option BT


Alloy Hearth Tray
7" x 11"
   Option AH812
11" x 11"
   Option AH1212
11" x 17"
   Option AH1218
11" x 23"
   Option AH1224





Inert Atmosphere Inlet Piping, complete with indicating flow control and gas valve. Specify atmosphere
Option IAIP

Quench Tank, carbon steel, 40 gallon capacity, 12" x 20" x 12" deep work basket, subway grating basket support, 1/2 HP direct driven mixer, 23 x 23 x 44 high overall, for 115 or 230/1/60
Option QT
Quench Tank Electric Heater, with temperature control
Option QTH

 
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