How to Measure Flow Rate with a DP Transmitter
Overview
This video explains how to measure flow rate using a Differential Pressure (DP) Transmitter, one of the most common methods in industrial process measurement.
The principle is based on creating a restriction in the pipe (such as an orifice plate), which generates a pressure difference between upstream and downstream.
The DP transmitter measures this pressure difference, and since flow rate is proportional to the square root of the differential pressure, the system can calculate the actual flow.
The transmitter then converts this measurement into a standard signal (like 4–20 mA) that can be read by PLC or SCADA systems for monitoring and control.
What You Will Learn
- How DP transmitters measure flow rate
- Concept of differential pressure (ΔP)
- Role of primary elements (orifice plate, venturi, etc.)
- Relationship between pressure drop and flow
- How signals are transmitted to control systems
Applications
- Flow measurement in pipelines (liquids, gases, steam)
- Oil & Gas and petrochemical industries
- Water and wastewater treatment systems
- Power plants and steam systems
- Process control and instrumentation systems
- Energy monitoring and industrial automation
