Parr Instrument Series 4550 - Manual (Page 12)

4550 Floor Stand Reactors
P a r r I n s t r u m e n t C o m p a n y 12
ACCESSORIES
Internal Cooling Coils
Cooling coils can be installed in any of these reac-
tors. Reactors purchased without a coil can have this
feature added.
Standard cooling coils are made in serpentine
configurations. A serpentine coil offers a smaller
but effective cooling area and it does not interfere
with the use of a liner. An optional spiral coil can
be provided, which offers more surface area than a
serpentine coil but it is more difficult to clean and,
when installed, it prevents the use of some internals
and liners. Plugs are available to seal the cooling
coil opening when the coil is not used.
Variable Speed Electric Motor
Reactors are normally equipped with a DC variable
speed motor supplied and controlled through the
Series 4848 Reactor Controller. Instructions for con-
necting and operating these motors are included in
the controller instruction sheet No. 548M. This motor
is usually installed in a drive system designed to
produce stirring speeds from 0 to 600 rpm. Higher
speeds (1000 or 1700 rpm) can be obtained by
substituting larger diameter motor drive pulleys.
Air Motor
Variable stirring speeds from 100 to 2000 rpm can
be obtained by replacing the standard motor with
an A1393HC air motor. This motor operates on
compressed air, which must be supplied at 40 psig
minimum pressure with at least 10CFM available at
that pressure. It is furnished with a speed control
valve and oiler.
To operate reactors equipped with an air motor, con-
nect the air hose to a compressed air line. Fill the
oiler with SAE 10 oil and adjust the oiler to feed one
drop per minute into the air stream. For long con-
tinuous runs at high speeds, the oiling rate should
be increased to three drops per minute. If the motor
becomes sluggish, flush it with a non-flammable
solvent in a well-ventilated area. Disconnect the air
line and muffler and pour a small amount of solvent
into the inlet port. Rotate the shaft by hand in both
directions for a few minutes; then connect the air
line and run the motor until there is no further
trace of solvent in the exhaust. If the muffler felts
are dirty, wash them in solvent or replace them.
Re-lubricate the motor with a squirt of oil into the
chamber and reassemble. If it becomes necessary to
disassemble the motor to replace the vanes, follow
directions given in the instruction sheet published
by the Gast Manufacturing Corp., Benton Harbor,
Michigan.
Liners
Glass or PTFE liners can be furnished to fit most
Parr reactors. These liners slide into the cylinder.
Although they will not keep corrosive vapors from
reaching the surfaces of the cylinder and head, they
make it much easier to add and remove liquid reac-
tants, and they give some protection to the cylinder
when working with corrosive solutions. It must be
noted, however, that adding a liner will slow the
heat transfer rate into the vessel, and it may be
necessary to adjust the temperature control method
to prevent overheating.
Liner Part Numbers
Fits
ID
Cylinder
Size
Glass
Liner
PTFE
Liner
6 inches 1 Gallon 894HC 894HC4HA
6 inches 2 Gallon 894HC2 894HC5HA
Spare Parts Kit
Parr can furnish spare parts kits for these reactors
which will provide a reserve supply of parts and
tools sufficient to handle most normal replacements
and emergency repairs during a year of heavy
usage.
These kits contain replacement gaskets, packing,
O-rings, shafts, bearings, and rupture discs. They
can be ordered from any Parr Dealer or direct from
the Parr Instrument Company. The order must
specify the reactor size and indicate type of rupture
disc, stirrer drive and whether it has a flat-gasket
or O-ring seal. Always provide the reactor serial
number (stamped on head and cylinder) to assure
receipt of proper replacement parts.