Good control requires measurements that are accurate, reliable, responsive and maintainable. These factors are influenced by the choice of principle used for the measurement, the detailed specifications and features of the instrument selected and specified; how well the instrument and its installation is maintained, and particularly the installation details.
The vast majority of physical measurements in processes are of the big four:
Positioner PI/PID Controller
While we titled “process” instrumentation because the larger number of applications is in process and utility applications, much of this instrumentation is used in many other areas of automation application wherever continuous measurements are needed.
Much of the focus is on compact “transmitters” devices that combine the sensor and communicating electronic in one package