A measurement module (100, 100', 200, 220, 300, 400) for measuring the differential pressure between a first and a second connection point (101a, 102a) arranged in a transport line for a fluid, the measurement module (100, 100', 200, 220, 300, 400) comprises: a first connection line for being connected to the first connection point, and a second connection line for being connected to the second connection point; a differential pressure sensor arranged in fluid communication with said first and second connection line (101, 102); a valve (120, 320, 420) arranged in fluid communication with said first and second connection line (101, 102), said valve (120, 320, 420) having an open state and a closed state, wherein said valve (120, 320, 420) in said open state fluidly connects said first and second connection line (101, 102) via said valve (120, 320, 420), wherein said valve (120, 320, 420) in said closed state prevents fluid flow between said first and second connection line (101, 102) via said valve (120, 320, 420); and wherein said first connection line is adapted to be connected to the first connection point and is configured to extend from said first connection point to said valve (120, 320, 420), and said second connection line is adapted to be connected to the second connection point and is configured to extend from said second connection point to said valve (120, 320, 420), wherein, compared to said valve (120, 320, 420), said differential pressure sensor is arranged closer to the first and the second connection point (101a, 102a) wherein the measurement module further comprises an actuator (121, 440) for actuating said valve (120, 320, 420) into said open state for enabling fluid to be flushed through the measurement module, characterized in that the measurement module comprises means which calculate a flushing time based on a differential pressure measured by the differential pressure sensor. a first connection line for being connected to the first connection point, and a second connection line for being connected to the second connection point; a differential pressure sensor arranged in fluid communication with said first and second connection line (101, 102); a valve (120, 320, 420) arranged in fluid communication with said first and second connection line (101, 102), said valve (120, 320, 420) having an open state and a closed state, wherein said valve (120, 320, 420) in said open state fluidly connects said first and second connection line (101, 102) via said valve (120, 320, 420), wherein said valve (120, 320, 420) in said closed state prevents fluid flow between said first and second connection line (101, 102) via said valve (120, 320, 420); and wherein said first connection line is adapted to be connected to the first connection point and is configured to extend from said first connection point to said valve (120, 320, 420), and said second connection line is adapted to be connected to the second connection point and is configured to extend from said second connection point to said valve (120, 320, 420), wherein, compared to said valve (120, 320, 420), said differential pressure sensor is arranged closer to the first and the second connection point (101a, 102a) wherein the measurement module further comprises an actuator (121, 440) for actuating said valve (120, 320, 420) into said open state for enabling fluid to be flushed through the measurement module, characterized in that the measurement module comprises means which calculate a flushing time based on a differential pressure measured by the differential pressure sensor.