What output signal does a basic differential pressure transmitter provide during flow measurement?

A basic differential pressure transmitter is designed to measure the difference in pressure between two points, often across an orifice plate or flow element in a piping system. During flow measurement, as the flow rate increases, the differential pressure measured by the transmitter also increases, leading to a corresponding output signal.

The output of the transmitter varies with the flow because the relationship between flow and differential pressure is directly proportional, following principles such as Bernoulli's equation and the flow equations for orifice flow. Hence, when the flow rate changes, the transmitter produces an output signal that reflects these fluctuations. The ability to provide a varying output signal in relation to the flow rate is fundamental in flow measurement applications, allowing operators to monitor and control fluid flow effectively.

In essence, the correct response underscores the dynamic nature of the differential pressure transmitter's output in relation to changing flow conditions.