The AV-EP series of air velocity probes are available in lengths from 100 to 600mm. They are used to ensure that recommended flow rates for public buildings and industrial plant are achieved. Using a PA-60-x, PA-65-x or PA-699 Air Differential Pressure Sensor of an appropriate range (please refer to data sheet on Sontays website for further information), the output of the sensor represents the velocity pressure and is defined by the following equation: