Parr Instrument 4857 - Manual (Page 3)

4857 Reactor Controllers
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P
REFACE
Scope
These instructions cover the installation and
operation of Parr Model 4857 Process Controller
as used with Parr Laboratory Reactors and
Pressure Vessels. They cover the basic
functions provided in each of these controllers.
The users should study the instructions carefully
before using any of these controllers so that they
will fully understand the capabilities of this
equipment and the safety precautions to be
observed in its operation.
Applications
Each Series 4857 Process Controller consists of
a packaged temperature control unit completely
wired and assembled with appropriate power
and safety relays, switches and pilot lights.
These units are designed specifically for use
with Parr reactors and pressure vessels and are
to be used only with Parr equipment.
Controllers furnished with Parr reactors
equipped with variable speed DC motors have a
motor switch and a speed control knob on the
front panel of the power controller. Controllers to
be used with AC equipment or an air motor do
not have a speed control knob.