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Model AHS Electric Furnaces are built to handle heavy loads. Temperatures up to 2500°F  are no problem for these rugged industrial performers, designed for economical operation, minimal maintenance and long life.


  • Heavy steel shell lined with high-quality insulation
  • Specially formed refractories and silicon carbide shapes
  • Heating elements above and below work chamber, spaced for temperature uniformity
  • Three circuits for balanced connection to power supply without transformers (220 Volt, 3 Phase)
  • Reaches 2200°F in approximately 90 minutes with new heating elements
  • Door located inside furnace shell -- eliminates "cold throat," provides front insulation thickness nearly equal to side walls
  • Custom grooves allow door to seal on four sides when closed
  • Two silicon carbide hearths can form a semimuffle for improved temperature uniformity, with only a small loss in height
  • Pneumatic door lift assembly with foot actuated pedal for operator convenience
  • Insulated for continuous operation at 2500°F

Normally supplied with all controls mounted, wired and ready for connection to your supply. Special control systems available on request. Special models available with longer chambers or higher heat, up to 2750°F.


Sentry Model AHS Specifictions
Size & Model 4 "AHS"
Work Chamber
Width 17 3/4"
Depth 27"
Height 10"
Semi-Muffle Height 8"
Max. Operating Temp. 2500°F
Electrical Rating - KW 53
Normal Operating Consumption - KW 13-24
Number of Heating Elements 9
Power Supply: Both Sizes - 220 Volts, 60 Hertz, 3 Phase
Air Pressure Required for
Door Mechanism
80 p.s.i.
Dimensions (Including Door Lift Mechanism) -
Width 52"
Height 81"
Depth 56"
Hearth Height 36"
Approx. Weight (With Controls) 3840 lbs.

America’s oldest steel heat treating furnace maker.