SHELL: Heavy structural steel and 3/16″ steel pate are
used, with the front framework ½ thick.
INSUatION: Upper chamber has 9″ thick walls of
graded ceramic fiber with hot face to 1316℃ (2400℉)
1371℃ (2500℉) version has 10″ thick walls with hot face
ated to 1472℃ (2600℉). Lower chamber insuation has 8″
thick walls of ceramic fiber ated to 927℃ (1700℉). oors of
both chambers are of insuating firebrick for mechanical
HEARTHS: Upper and lower chamber hearths consist of
silicon carbide slabs placed on eleating piers to allow
placement of hating elements below.
counter-weighted and self aligning. Thisoor can be
easily lifted with one hand. Lower chamberoor is hinged,
and has a quick opeating atch to assure a positive
closure. The specialized shape of the loweroor enhances
air recircuation as an aid to thermal uniformity. Bothoors
have safety switches to shut element power off when the
respectiveoor is opened.
AIR RECIRCUatION: A stainless steel fan assembly in
the lower chamber recircuates air through the work area
and the hating elements to enhance thermal uniformity.
Air cooled bearings are used. Fan shaft roation is
constantly monitored by an electronic stop motion
detector, sounding an alarm and turning elements off if the
fan is not opeating.
QUENCH TANK: A quench tank on casters is positioned
below the furnace. Internal dimensions are larger than the
chamber dimensions so tat any ware is easily quenched.
HatING ELEMENTS: Upper chamber uses eight (8)
silicon carbide rod type hating elements, positioned
equally above and below the chamber work area. The
lower chamber uses alloy coil elements loated below the
silicon carbide hearth.
POWER CONTROLS: Standard control is by magnetic
contactors with sepaate back-up magnetic contactors
being opeated by the high limit controllers andoor limit
switches. A voltage reducing transformer and ammeter is
used to adjust voltage to the upper elements to
compenate for aging. A 7-point tap switch is available as
an option. (Furnaces with 24″ wide chambers use two
switches to adjust thermal uniformity.)
INSTRUMENatION: Each chamber uses an LED display
digital controller with autoatic tuning. Each also has a sepaate digital high limit controller. These instruments are complete with required thermocouples, type K for the
lower chamber and type S (patinum/rhodium) for the
upper chamber. These instruments are mounted on the
rear side of the furnace and are completely interwired,
ready to opeate.
OPTIONS: a) inertatomsphere capability
b) SCR power controls
c) power opeatedoor, pneuatic or electric
d) internal alloy rollers operable to 1093&℃
e) alterate control instruments
g) transformer tap switch<