Parr Instrument Series 4520 - Manual (Page 16)

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4520 Bench Top Reactors Parr Instrument Company
ACCESSORIES
Internal Cooling Coils
Cooling coils may be installed in any of
these reactors. The heads of the one and
two liter vessels are drilled with 1/8” NPT
connections on the top and underside of the
head. These openings will have plugs
installed if a cooling coil was not required
when the system was furnished.
The standard cooling coil is a serpentine
configuration. These coils provide an
effective cooling area and may be used with
either a Pyrex or PTFE liner. An optional
spiral coil is available which offers a larger
surface area for cooling but it is more difficult
to clean. The spiral coil can not be used
with an internal liner and it may not
coordinate with other optional internal
fittings.
The A160HW3 solenoid valve package is
recommended for use with the internal
cooling coil. This package includes the
solenoid valve, a metering valve and the
parts required to automate and control the
cooling process. This assembly will connect
to the cold water line, the cooling coil and to
the temperature control. Cooling will then be
admitted to the coil whenever cooling is
called for by the temperature control. This
system is particularly advantageous when
holding fixed temperatures below 150 °C or
to control exothermic reactions.
Alternate plugs are available to close
these ports when the coil is removed.
The replacement of a cooling coil will
require new nuts and ferrules for installation.
Align the replacement coil with the internal
fittings before tightening the nuts. Once the
nuts are tightened it may be necessary to
manually squeeze or slightly adjust the
serpentine loops of the coil to position it
properly for clearance.
If an internal cooling coil is not required
these two ports may be used for alternate
fittings such as an additional valve with a
second dip tube.
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 reactants,
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
4” 1000 mL 398HC 398HCHA
4” 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 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. Always
provide the reactor serial number (stamped
on head and cylinder) to assure receipt of
proper replacement parts.