Go through Process Controllers and Converters which are significant because they provide as a link between electrical and pneumatic control system measurements. They also translate the outputs of electronic controllers into air pressure signals for pneumatic control valve operation. They are very easy to install as well as simple to use. Process Controllers and Converters are now available in a few ranges like Selec PID Controller, Moxa Uport 11501 Communication Converter, and Prayosha Signal Converter. They are a small module device that converts a current analog signal into a pneumatic output in applications.