How does a differential pressure transmitter function and in which applications is it typically used?

• A. It measures temperature difference across a primary element and outputs a flow signal.
• B. It measures absolute pressure and outputs a density signal.
• C. A differential pressure transmitter measures the pressure difference across a primary element and converts it to a flow signal using a calibration curve; used in steam, gas, and liquid flow applications.
• D. It measures flow directly without pressure sensing.

Answer: (C)