As plants have gained experience using wireless measurements to monitor process operations, they have found the transmitters to be reliable and are now looking at how to incorporate these wireless measurements into closed-loop control. The natural choice for implementing feedback control is the proportional, integral, derivative (PID) algorithm, since it is the dominant control technique in the process industry. However, the slow sample rate and delay that are characteristic of wireless measurement present new technical challenges in implementing control in some applications. A new control approach is required to achieve effective control using a wireless measurement.Full Story
Four main methods are available for implementing automation in hazardous areas. Here's how to select the best one for your application.