User Manual
4848B Reactor Controller
Parr Instrument Company
2
Preface 
Related Instructions
The following Parr publications are also included to 
further your understanding of this instrument and 
its component parts:
No. Description 
201M Limited Warranty 
576M 4848B Controller CD
Scope
These instructions cover the installation, opera-
tion and maintenance of Parr Model 4848B Reactor 
Controller as used with Parr laboratory reactors and 
pressure vessels. They cover the basic functions 
provided in each of these controllers and describe 
the several optional control modules which can be 
added to these expandable units. The users should 
study the instructions carefully before using any of 
these controllers so that they will fully understand 
the capabilities and limitations of this equipment 
and the safety precautions to be observed in its 
operation.
Customer Service
Questions concerning the installation or operation of this instrument 
can be answered by the Parr Customer Service Department:
1-309-762-7716 • 1-800-872-7720 • Fax: 1-309-762-9453
E-mail: parr@parrinst.com • http://www.parrinst.com
Applications
Each 4848B Reactor Controller consists of a pack-
aged temperature control unit completely wired 
and assembled with appropriate power and safety 
relays, switches and pilot lights. 
These units are designed specifi cally 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. Con-
trollers to be used with AC equipment or an air mo-
tor do not have a speed control knob.










