What kind of electrical measurement is typically utilized in process control?

In process control, current measurement is typically the most utilized electrical measurement because it provides a reliable means of monitoring and controlling various parameters within a system. Current is often used due to its proportional relationship to the physical variables being monitored, such as flow, temperature, or pressure.

For example, in a process control system, a 4-20 mA current loop is commonly used; this range allows for the transmission of signals over long distances with minimal degradation. The 4-20 mA standard means that a 4 mA signal represents the lower limit of the measurement range, while 20 mA represents the upper limit. This method offers several advantages, including noise immunity and the ability to provide power to devices, thus enhancing overall system reliability and efficiency.

Other electrical measurements such as AC voltage, DC voltage, and power measurement are relevant in various applications, but they do not provide the same level of direct feedback and control for process variables as current measurement does. In essence, current measurement is integral in ensuring accurate and responsive control in process systems.