PID Controller :

A proportional-integral-derivative controller (PID controller) is a control loop feedback mechanism (controller) that calculates an error value as the difference between a measured process variable and a desired setpoint and attempts to minimize the error by adjusting the process through use of a manipulated variable.

F4 Process Controller

VM96 Valve Controller

VD Series Low Cost Temperature Controllers

VT9621 Fuzzy Enhanced PID Dual Channel Controller

Multi-Channels Module
Type PID
Controller (MMC)

VT26 Fuzzy Enhanced PID Controller