Parr Instrument Series 4530 - Manual (Page 12)

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
confi gurations. 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 diffi cult 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 controller. Instructions for connecting
and operating these motors are included in the con-
troller instruction sheet No. 548M. This motor is usu-
ally 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, fl ush it with a non-fl ammable
solvent in a well-ventilated area. Disconnect the air
line and muffl er and pour a small amount of sol-
vent 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 muffl er 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 fi t 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 nec-
essary to adjust the temperature control method to
prevent overheating.
Liner Part Numbers
Cylinder Size Glass Liner PTFE Liner
1000 mL 398HC 398HCHA
2000 mL 399HC 399HCHA
Spare Parts Kit
Parr can furnish spare parts kits for these reactors
which will provide a reserve supply of parts and
tools suffi cient to handle most normal replacements
and emergency repairs during a year of heavy us-
age.
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 fl at-gasket or O-
ring seal. Always provide the reactor serial number
(stamped on head and cylinder) to assure receipt of
proper replacement parts.