Parr Instrument 4575/76 HP/HT - Manual (Page 10)

P a r r I n s t r u m e n t C o m p a n y
4575/76 HP/HT Pressure Reactors
10
Accessories
Internal Cooling Loop
A cooling loop 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 coor-
dinates 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.
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
2.5” 250 mL 762HC10
2.5” 500 mL 762HC2 762HC11HA
Spare Parts Kit
Spare parts kits are available for these reactors. The
kits will provide a reserve supply of parts and tools
sufficient to handle most normal replacements and
emergency repairs during a year of heavy usage.
The kits contain small perishable items required for
continuous operation including gaskets, bushings,
rupture discs and seals. 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. It is
most advantageous to provide the complete vessel
number from the head or cylinder.
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 Manual 548M. 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 a larger diameter motor drive pulley.