Tempering Bench Furnaces

Bulletin BF-730

COMPANION ELECTRIC
TEMPERING FURNACE AND
QUENCH TANK

Electric Tempering Furnace can be combined with Electric Bench Furnaces or Inert Atmosphere Bench Furnaces to produce a space saving, over and under, heat treating and tempering furnace combination. The top chamber with its manually operated vertical lift door can be selected from among four sizes of 11000F and 12000C Bench Furnaces described on Bulletin BF-710 or Inert Atmosphere Bench Furnaces described on Bulletin BF-720. The Quench Tank is a free standing unit available with electric heat.

STANDARD FEATURES

Controls

- Digital, microprocessor based, thermocouple actuated, indicating temperature controller
- On-off heat switch
- Easy-to-see pilot light

Safely Equipment

• Adjustable, thermocouple actuated, manual reset excess temperature controller
• Separate heating element control contactor
• Door interlock switch turns off power to heating elements and blower when door is opened; restores power when door is closed

Construction

• Recirculation blower located in back wall
• Heavy gauge aluminized steel cabinet with enamel finish
• Brushed stainless steel control panel face
• Designed to support heat treating furnace
• Well insulated, side-hinged door
• High temperature alloy heating elements supported by rugged ceramic plates
• Energy-saving lightweight ceramic fiber insulation reduces operating costs
• Fast heat-up
• Heating elements located on sidewall and roof for excellent temperature uniformity throughout workspace
• Ceramic hearth tray
• 1 year limited warranty

Optional Quench Tank

• Expanded metal loading basket
• Use with water, oil or synthetic solutions
• ½ HP direct subway grate basket support
• Optional electric heat

All equipment fully assembled and individually factory tested

SPECIFICATIONS

Electric Models

Safety devices as listed on the front of this bulletin. Heating element contactors electrically interlocked with door to shut off power to heaters as door opens and restores power when closed. High temperature alloy coiled wire-heating element supported in alloy rack, Heating elements located in heat chamber upstream of the recalculating blower. Exhaust outlet 4'" diameter.

Gas Models

- 1,000 BTU natural gas at 2-psig pressures. 1" NP inlet up to 800,000 BTU/HR
- Other gas characteristics available
Safety devices as listed on the front of this bulletin. Automatic preignition purge period and push button electric ignition contributes to ease of operation. Modulating gas burner fires into chamber upstream of the re-circulating blower. Gas burner protected with electronic flame safety relay. Door interlock switch drives main burner to low fire when door is opened and restores control when door is closed. Exhaust outlet 6" diameter.
Furnace shell is made of 3/16" thick steel plate reinforced with structural steel. Doorsill constructed from firebrick to protect furnace during loading. Stainless steel grid at bottom of workspace to distribute loading. Soft insulation on door provides an excellent heat seal by pressing against the vestibule refractory and ½" thick steel front plate. Exterior painted with Trilite Green enamel. Each features completely wired side access control panel assembled on the furnace enclosing terminals for incoming power, temperature controllers, push buttons and pilot lights.

Electric Door

Door pivots upward above furnace, clearing front for easy loading. In the closed position, full door weight seats door firmly against furnace face. Structural steel pivot arms are supported at furnace sidewalls by bearings and connected to a heavy-duty electro-mechanical actuator. The door is controlled by a switch at the furnace control panel.

Air Door

Door rises vertically in front of the furnace hanging from heavy-duty roller chain, sprockets, shaft and pillow block bearings. In the closed position, rollers at the sides of the door engage support brackets to force the full door weight against the furnace face. Large diameter air cylinder rotates support shaft to lift the door. The door is controlled by a manual air valve with supply filter, lubricator and regulator.

ADDITIONAL EQUIPMENT AVAILABLE

• Programmable Temperature Controller, microprocessor based, digital indicating, thermocouple actuated, in lieu of standard controller.........................................................PTC3
• Recording Thermometer, thermocouple actuated, 24-hour, 10" diameter circular chart used in conjunction with standard controller.............RT
• Programmable Recording Temperature Controller, microprocessor based, thermocouple actuated, digital display, 24-hour, 10" diameter circular chart, in lieu of standard controller ....................PRTC3
• Digital Timing System, incorporated into standard temperature controller, 99 hour 59 minute range, starts timing at temperature set point and shuts down furnace at end of set time .........................DTS3
• Shut Down Timer, with continuous "hold" feature 1,5, 10 or 30 hour range.............SDT
• Batch Timer, for uniformly timing batch operations. Continuous alarm with door interlock; alarms at end of preset time period until door is opened or timer reset. 1,5,10 or 30 hour range........................ BT
• Inert Atmosphere Construction, available on electric furnaces only, includes continuously welded furnace shell, inert atmosphere gas inlet and outlet, sealed terminal boxes, high temperature door gasket....IAC
• Inert Atmosphere Inlet Piping, complete with indicating flow control and gas valve. Specify atmosphere...IA

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