Differential pressure flow meters work by introducing a restriction to the pipe and measuring the difference in pressure via 2 pressure transmitters. The first stage requires a pressure drop across the flow meter by introducing some form of restriction. This restriction enables Bernoulli’s equation to be used for a flow rate calculation. The differental pressure drop is then measured by a differential pressure transmitter and combine to work alongside other flow solutions within the system, such as flow conditioners and venturi tubes.