Measuring Transmitter: The measuring transmitter, or sensor, senses the value of the controlled variable and converts it into a usable signal. Although the measuring transmitter is considered as one block, it usually consists of a primary sensing element and a signal transducer (or signal converter). The term measuring transmitter is a general term to cover all types of signals. In specific cases, the word measuring is replaced by the name of the measured signal (e.g., temperature transmitter, flow transmitter, pressure transmitter, etc.).