What device interprets the measured value and transmits the measurement to a controller?

The transmitter is the device that plays a crucial role in interpreting the measured value from a sensor or primary element and then relaying that measured data to a controller. In an instrumentation system, the primary element detects the physical property (like temperature, pressure, or flow rate), and the secondary element converts that measurement into a usable signal.

Once the sensor detects the physical value, the transmitter processes this signal, possibly amplifying or converting it into a standard signal format (such as 4-20 mA or 0-10 V) that can be easily transmitted over distances. The accuracy and reliability of the measurement are vital as they directly influence the controller's ability to execute necessary adjustments in the system based on real-time data. This makes the role of the transmitter essential in process control, ensuring that the controller receives accurate and timely information to maintain optimal operation of the system.