BENCHTOP LABORATORY MUFFLE FURNACE

MUFFLE FURNACE CHARACTERISTICS

• Cabinet design & construction choice of Enamel coated 16 gauge steel or (304) stainless steel
• Horizontal opening door heavily hinged door With a 180° opening
• Insulation 4½”/11cm pre-grooved refractory bricks (With the exception of the f50, which is 2 ½”)
• Temperature controller microprocessor temperature controller, with auto tuning pid parameter offering ramp/soak program capability
• Heating elements low watt density fecral heating elements
• Furnace chamber hearth plate the furnace comes standard with a cordiorite hearth plate.

FURNACE OPTIONS

• Vertical opening door Counterbalanced guillotine lifting door with “Zero weight positioning”
• Furnace floor stand Heavy-duty furnace stand
• Ni-cr heating elements Special heating elements used in corrosive environment
• Programmable controller 2 programs with 8 segments ramp/soak
• Solid state relay (ssr) For increase temperature accuracy and silent operation
• Adjustable exhaust vent Slide gate located on top of furnace to vent corrosive vapors, also comes with a peephole in door
• High limit controller Automatically shutdown heating elements when maximum temperature is exceeded
• Door safety switch Automatic Shut off heating elements when door is opened
• 3 phase 208-240v Available for the F300/F400
• Heating elements in door Offers greater heat distribution

OPERATING PROCEDURE

The furnace is preheated with a gas flame, gradually raising the temperature to 1600°F. The oil burners are then started and the temperature of the combustion chamber elevated to 2400°F. Preheating requires about ten days.
Charging of metal is started at 2400°F and the production of zinc vapor begins almost at once. Charging is continued at as rapid a rate as possible until a depth of 5½ in. of metal has accumulated in the vaporizing unit.

Conditions which determine the end of the cycle are: The rate of zinc vapor production for economical operation of the furnace, a low zinc content in the residue metal, as tapped from the furnace, and a lead content low enough to meet the requirements of the particular zinc oxide being produced.

The cycle is ended by tapping residue metal from the vaporizing chamber, emptying it as far as possible. This metal is drained through a tap, not shown, into cast iron molds. The temperature of the furnace is held constant while it is being drained.