Parr Instrument Series 5100 - Manual (Page 10)

P a r r I n s t r u m e n t C o m p a n y
5100 Low Pressure Reactors
10
Accessories
Air Motor
Variable stirring speeds from 100 to 2000 rpm with
no spark hazard can be obtained by replacing the
standard motor with an air motor. This motor oper-
ates 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, all assembled on a
mounting bracket.
To operate reactors equipped with an air motor,
mount the drive system firmly on the support stand
and connect 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 continuous 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-flam-
mable 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.
Relubricate 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.
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 closure.
Mantle Heaters
Mantle heaters with high temperature fabric heating
mantles housed in sturdy aluminum shells can be
provided for any plain (non-jacketed) cylinder. These
heaters are designed to provide uniform heat dis-
tribution to the walls and bottoms of these vessels.
They are attached to a support rod with a spring
steel clamp and arranged so that they can be raised
or lowered on the rod as desired. Each mantle must
always be used with the vessel of the size for which
it was designed, and must always be fully attached
to the vessel before heat is turned on. Similarly, a
short vessel must never be heated in a deep mantle.
Without full contact with a vessel wall, a mantle will
overheat and burn out.
Variable Speed Electric Motor
Reactors are normally equipped with a DC variable
speed motor supplied and controlled through the
Series A2110E or 4848 Controllers. Instructions for
connecting and operating these motors are included
in the controller’s instruction manual No. 553M
or 548M. This motor is installed in a drive system
designed to produce stirring speeds from 0 to 1700
rpm.
Cooling Loop
Each 5100 Reactor has a single loop cooling coil
installed in the vessel (except the 160 & 215 mL
units). A slow, continuous flow of cold water
through a cooling loop proves a very effective
means for controlling temperature overshoot in
these reactors, particularly when operating at tem-
peratures below 150 °C. Water flow through the loop
can be controlled automatically using a solenoid
valve in the cold water line, with the solenoid con-
nected to the cooling socket on the rear panel of the
4848 Reactor Controller. With this arrangement, cold
water will be admitted to the cooling loop whenever
the controller calls for cooling.