4 8 4 8 R e a c t o r C o n t r o l l e r
w w w . p a r r i n s t . c o m
3
1. Temperature
Control Module
(TCM)
The temperature
control module can
accept either ther-
mocouples 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 func-
tion is a full propor-
tional, integral and
derivative (PID) con-
trol with auto-tune
capabilities.
The controller
provides ramp and
soak programming
with up to 64 seg-
ments.
The temperature in the reac-
tor is transmitted to and dis-
played on the PC on a continual
basis.
2. Pressure Display Module
(PDM)
The pressure monitoring
module is set up to accept its
input from a pressure transducer
mounted on the reactor or at-
tached accessory. It can be set
to accept a wide variety of op-
erating ranges. Operating pres-
sures are transmitted continu-
ously to the PC. These modules
are available calibrated in either
psi or bar.
In most applications, pres-
sures are controlled by either a
forward or back pressure regula-
tor.
The output from the pres-
sure monitoring module is
connected 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 stir-
rer speed and will continuously
transmit it to the PC for display
and logging. The stirrer speed
is set manually using a potenti-
ometer on the face of the 4848
Controller.
3B. Motor Control Module
(MCM)
In this configuration, the
module provides true closed loop
feedback control of the reac-
tor stirring speed. The primary
output of this module is wired
to dynamically adjust the motor
voltage in response to changes
in motor loading. This provides
better reactor stirring speed
regulation than the standard
open loop speed control, espe-
cially with reactions that involve
changing viscosities. Addition-
ally, the use of this module
allows the stirring speed set
point to be adjusted remotely
from the host PC. A byproduct
of this closed loop speed control
scheme is that the value of the
primary controller output directly
Screenshot from remote PC showing Set Point and Process values for up to four
variables. Lower section showing operating parameters of active module.
