CLAMP-ON ULTRASONIC FLOW METERS IS210 – IS210 transit time flow meter utilizes two transducers that function as both ultrasonic transmitters and receivers. The transducers are clamped on the outside of a closed pipe at a specific distance from each other. When the flow meter works, the two transducers transmits and receives ultrasonic signals amplified by multi beam which travels firstly downstream and then upstream. Because ultra sound travels faster downstream than upstream, there will be a difference of time of flight.
DIFFERENTIAL PRESSURE FLOW SENSORS – Once an object is brought into a laminar flowing fluid inside a pipe, the fluid will dam up in front of the object, which generates a raise of pressure. Passing the object the fluid gets accelerated due to the smaller pipe cross section. This acceleration generates a pressure drop on the backside of the object. As all operational conditions at the place of measurement are known, the volume of flow can be calculated by using the difference of the two pressures. D.P. flow elements are Itamar-Flow-Sensors.