Pitot tube of stainless steel pipe with two different straight concentric socket, tube straight tail end joint is total pressure tube, outer tube side joint is static pressure tube. Pointing in the direction bar and rod head a, can determine the direction, when using the measuring head alignment to flow direction. The S type pitot tube is made by the two teams with operate back, windward side of the pressure side, leeward side for static pressure. 1, to the correct selection of points section, to ensure the measuring point straight pipe in air flow smoothly. Therefore, measuring the cross section from the flow direction of the elbow, valve, variable diameter abnormity tube local component is greater than 4 times the pipe diameter. From the downstream direction of local bend, the structure of the variable diameter should be greater than 2 times the pipe diameter. 2, the diameter of the pitot tube specification selection principle is measured pipeline diameter ratio, and is not zero. 02. In order to avoid interference, make error increases. Don't let the pitot tube measurement near the pipe wall. 3, when measuring the total pressure shall be holes on the airflow direction, to point to the pole. Measure point should try to avoid air leakage on insert hole, prevent the airflow interference on the cross section. According to the tube measurement specification, should choose the measuring point of the measurement section. 4, pitot tube can only be measured on the pipeline section velocity of one point, but the average flow velocity should be used when calculating flow, because of the uneven distribution of cross section flow, so this section should be more measuring points, in order to calculate the average. 5, measuring point by flue ( Pipe) Measurement method, according to a linear logarithmic method, can also according to the commonly used uniform area. 6, S type pitot static pressure type joint marked number, and note the pitot tube on the identification of single factor. Identification of single should be kept for a long time for computation.