parr 4520, Operating Instructions Manual, Page: 15 / 32

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4520 Bench Top Reactors
Parr Instrument Company
HOW TO USE THE VESSEL
(
Continued
)
To Open the Vessel at Completion
of a Test
Fixed Head Units: Lower the heater
and swing it out of the way. Raise the
cylinder support to the cylinder bottom.
Open the gas release valve to discharge any
internal pressure. The split ring closure may
now be removed by unscrewing the bolts or
opening the latches. The head with all of the
attached fittings may remain in the support
plate. The cylinder can be lowered away.
Care should be taken when removing the
cylinder so damage will not occur to the
internal fittings.
Moveable Head Units: Lower the
heater and swing it out of the way. Open the
gas release valve to discharge any internal
pressure. Remove the complete vessel
assembly from the support stand and place
it on a countertop. The split ring closure
may now be removed by unscrewing the
bolts or opening the latches. Care should be
taken when lifting the head from the cylinder
so damage will not occur to the internal
fittings.
Initial Operating Test
Read all operating instructions carefully
so as to be well acquainted with the correct
procedures for handling the vessel and for
operating the controller and other
accessories. An initial operating test should
be made, with only water, to check the
apparatus before starting the first
experimental runs. For this initial test, fill the
cylinder not more than half full of water and
run the temperature up to 150ºC while
checking the apparatus for leaks and
observing the performance of the
temperature controller.
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
controller instruction sheet No. 548M. This
motor is usually 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.