A proportional–integral–derivative controller (PID controller or three-term controller) is a control loop feedback mechanism widely used in industrial control systems and a variety of other applications requiring continuously modulated control.
OVERVIEW
The DC1000 family of microprocessor based controllers  combine a high degree of  functionality and reliability at a  very low price. 
Available in 4 different formats : 1/16 DIN, 1/8 DIN, 3/16  DIN, 1/4 DIN. 
These controllers are ideal for regulating  temperature in a variety of  applications, including : 
The DC1000 family provides basic control requirements, plus advanced features such as motor position control, phase angle power control and Setpoint programming.