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P a r r I n s t r u m e n t C o m p a n y
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R e a c t o r C o n t r o l l e r s
4848 Reactor Controller
T
he 4848 Reactor Controller
brings digital communica-
tions to all of the functions of
this modular reactor controller.
The 4848 offers all of the
features expected in a Parr
general purpose reactor con-
troller, namely:
• PID programming for pre-
cise temperature control and
minimum overshoot
• Ramp and soak program-
ming
• Separate heating and cool-
ing control loops
• Motor speed control
• Full or half power heater
option
• Lockout relay and reset for
over temperature protection
• Expansion modules for
tachometer, pressure, and
high temperature alarm
• Optional Solenoid Valve
Module for cooling control
• Auto tuning of PID param-
eters
With the Parr 4848 Reactor
Controller, all of the expansion
modules as well as the primary temperature
controller are equipped with bidirectional digital
communications [RS-485] that enable the user
to not only log all current readings to a PC, but
also to send set points, stirrer speeds, and alarm
values from the PC to the 4848 Controller.
Modular Design
A total of seven different modules are offered
for the 4848 Controller. A maximum of three
expansion modules in addition to the primary
temperature control can be installed in the
4848 Controller. The user can select either the
Tachometer Display Module or the Motor Control
Module. This either/ or option also applies to
the High Temperature Cut Off and External
Temperature Limit Modules.
The 4848B has a larger chassis to accommo-
date up to six expansion modules.
1. Temperature Control Module (TCM)
The temperature control module can accept
either thermocouples or RTD temperature
sensors. It has three outputs that are used
for heating and cooling control and for alarm
actuated heater cut off. The control function is
a full proportional, integral and derivative (PID)
control with auto-tune capabilities. The controller
provides ramp and soak programming with up to
49 segments.
2. Pressure Display Module (PDM)
This pressure monitoring module is set up
to accept its input from a pressure transducer
mounted on the reactor or attached accessory.
It can be set to accept a wide variety of operating
ranges. Operating pressures are transmitted
continuously to the PC. These modules are
available calibrated in either psi or bar. In most
applications, pressures are controlled by either a
forward or back pressure regulator. The output
from the pressure monitoring module is con-
nected to the alarm relay to shut off power to
the heater if the high pressure limit set by the
operator is reached during operation.
3. Tachometer Display Module (TDM)
In this configuration, the module will display
the stirrer speed and will continuously transmit
it to the PC for display and logging. The stirrer
speed is set manually using a potentiometer on
the face of the 4848 Controller.
4848 Reactor Controller shown with MCM, PDM, and HTM Expansion Modules installed.
