In a basic differential pressure transmitter used for flow measurement, how does the output signal behave?

In a basic differential pressure transmitter used for flow measurement, the output signal is directly related to the difference in pressure between two points, which reflects the flow rate through the system. As the flow increases, the differential pressure between the two points also increases, resulting in a corresponding increase in the output signal of the transmitter. This signal is typically an analog signal, such as 4-20 mA, that varies proportionally with flow changes. This relationship allows for real-time monitoring and control within various applications, making it essential for accurate flow measurement in industrial settings.

Constant output would imply no change in flow rate, which is not the case in a functioning system. Random fluctuations in the output signal would indicate instability or noise in the measurement, which does not represent the typical operation of a properly functioning differential pressure transmitter. A decrease in the output with increased flow would contradict the fundamental principle of how the transmitter is designed to operate, as the aim is to provide a measurement that increases with flow rate. Thus, the behavior of the output signal varying with the flow is central to the effective operation of a differential pressure transmitter.