6
Preparing the Furnace
To prepare the muffle furnace for operation, perform the
following procedures:
1. Make certain all packing material is removed
from furnace chamber.
2. Place hearth plate on the bottom of the cham-
ber. Orient hearth plate such that smooth sur-
face faces upward. See Fig. 1.
3.
With the Model 126
, the supplied shelf may be
used. If desired, install shelf by sliding it onto
top of ledge protruding from each side of the
inner chamber walls.
4.
If installing the accessory Exhaust Tube
Assembly,
first locate exhaust port at top of fur-
nace (see Fig 1). Use three screws to secure
the port flange to the exhaust port. Attach tub-
ing to port flange using a hose clamp (provided).
Finally, route free end of tube to fume hood or
other outside vent. If desired, exhaust tube may
be cut to length using a hacksaw.
I
NSTALLATION
Warning
Isotemp Muffle Furnace chambers
contain alumina silicate ceramic fibers.
With continued use at temperatures
above 1000°C (1832 °F), these materi-
als slowly convert to crystalline silica
(cristobalite). Long-term exposure to
airborne cristobalite may result in
severe respiratory diseases in
humans. Tests with laboratory animals
suggest that cristobalite is a possible
carcinogen. Short-term effects may
include irritation to skin, eyes and the
respiratory tract. Please consult the
Material Safety Data Sheet (MSDS)
provided by Fisher Scientific for further
information.
Warning
This unit is not explosion proof.
Do
not use in the presence of flammable
or combustible materials; fire or explo-
sion may result. Unit contains compo-
nents that may ignite such materials.
