Gefran 2850T SERIES, 3850T SERIES General Product Line Information

ENG

AUTOMATION

MULTIFUNCTION CONTROLLER

2850T / 3850T SERIES

CODE 81371B

A SINGLE CONTROLLER FOR DIFFERENT USES

Gefran’s catalog has a new series of controllers for applications that require control, datalogger, and setpoint
functions.

UNIVERSAL MULTILOOP PID CONTROLLER

Independent PID control for each zone.
Cascade control.
Ratio control.
Specific process functions.

Compliance with AMS2750 and CQI-9

for Aerospace/Automotive applications.

DATALOGGER AND BATCH REPORT

Standard CSV file.
Encrypted format.
Report utility for PC.
Graphic trend view.

SETPOINT GENERATOR

Synchronous setpoint profiles.
Asynchronous setpoint profiles.
Up to 4 SP profiles (Ramp&Soak)

for each program.

22

… AND MUCH MORE

GETlogic

2850T/3850T

A

IN

MAX

B

MIN

C

OUT

Control logics.
Process interlock.
Mathematical functions.
Process functions.

GETview

Custom graphic pages.

CONNECTIVITY

VNC remote service.

Modbus TCP fieldbus.

Examples of cascade control

Exchanger

Measurement

UNIVERSAL MULTILOOP CONTROLLER

0 1 2 3 4 5 6 7 8

SCALABLE AND EFFICIENT PID CONTROL

Gefran’s 2850T – 3850T series of controllers provides multiloop PID control solutions with advanced control
functions and simple configuration.

The controllers use a cutting-edge PID control algorithm for high performance and reliable process control.
Each PID can be easily configured as a single loop controller, connected to the profile generator, as a cascade
controller or ratio controller.
Compliance with AMS2750 and CQI-9 standards, allows to use Multifunction series in Aerospace and Automotive
applications, as a temperature PID controller and data logging.

AUTOTUNING

The controllers have an efficient tuning algorithm that ensures stable and
accurate temperature control, preventing overshoots and oscillations even

in critical or very fast thermal processes.

PROCESS FUNCTIONS

Heat treatments and sterilization processes require specific functions to ensure a satisfactory result and, in
many cases, to certify the finished product.
Gefran integrates some of the most common process functions in its 2850T and 3850T controllers. One of these
functions is the F0 algorithm for calculating the sterilization coefficient, used in sterilization applications to
check, guarantee, and certify the quality parameters of the treated product.

Process Fluid

Steam
Valve

Steam

FT

100

FIC
100

Flow Controller

(secondary)

Shell and Tube Heat

TIC
100

TT

101

Temperature
Controller
(primary)

Temperature

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

0

Kp = 5

K

1

K

d

= 3

= 0.8

CASCADE CONTROL

Cascade control is a system with two inputs and one output, with two nested
PIDs, the first of which supplies the setpoint for the second.
This system guarantees more stable temperature control and reduces the
error between the measured and set value.

On the other hand, if you have to control a variable based on another one
and keep a constant ratio between them (for example, a mix of fluids), ratio
control is the answer.

44