Parr Instrument Series 4540 - Manual (Page 11)

4540 High Pressure Reactor System
w w w . p a r r i n s t . c o m 11
ACCESSORIES
Serpentine Cooling Coil
A Serpentine Cooling Coil can be installed in any
of these reactors. The reactors are not drilled for a
cooling loop unless so ordered. Reactors purchased
without a serpentine cooling coil can have this fea-
ture added by returning the head assembly to Parr
Instrument Company.
If ordered the serpentine cooling coil is mounted to
the underside of the head and sealed with a ferrule
and compression nut arrangement.
A slow continuous flow of cold water through the
cooling loop is an effective means for controlling
temperature overshoot, particularly when operating
at temperatures below 150 °C. Alternately the cool-
ing loop is used to effectively cool the system at the
completion of a reaction.
An optional solenoid valve package is available to
automate the cooling process. This package coordi-
nates with the internal coil, with the water supply and
connects to the temperature control.
If the internal cooling is not required, the coil may be
removed and the alternate plugs installed.
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 reac-
tor size and indicate type of rupture disc, stirrer drive
and whether it has a flat-gasket or O-ring closure.
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 PTFE 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
3.25” 600 mL 2312HC 2312HC3HA
3.25” 1200 mL 2312HC2 2312HC4HA
Variable Speed Electric Motor
Reactors are normally equipped with a DC variable
speed motor supplied and controlled through the
4848 Reactor Controller. Instructions for connect-
ing and operating these motors are included in the
controller instruction sheet No. 232M. This motor
is usually installed in a drive system designed to
produce stirring speeds from 0 to 600 rpm. Higher
speeds up to 1700 rpm can be obtained by substitut-
ing larger diameter motor drive pulleys.
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 heater and
connect the air hose to a compressed air line. Fill the
oiler with SAE 10 motor 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-
flammable solvent in a well ventilated area. Discon-
nect 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 not 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.