L standard coefficient in 0. 99-1. 01, S stem coefficient in 0. 81-0. 86. Measurement of air flow rate is less than 40 m & bull; s - 1, measure the water flow speed is not more than 25 m & bull; s - 1. φ; Zui 8 1000 mm long, & Phi; 10 zui 1800 mm long, special specifications should be negotiated with the user customization. Second, the main use: in scientific research, production, teaching, environmental protection, and tunnel, mine ventilation, energy management, commonly used pitot tube measurement of ventilation pipes, industrial piping, furnaces flue gas velocity, after conversion to determine the flow rate, measurement of flow velocity in the pipe. With pitot speed and determine traffic, according to have reliable theory, easy to use, accurate, is a classic wide measuring method. In addition, it also can be used to measure the pressure of the fluid. Three, structure: standard pitot tube with two different diameter tubes were concentric socket, tube straight tail end joint is total pressure tube, outer tube side joint is static pressure tube, when using can not be wrong. Side pointing in the direction of bar and rod head in the same direction, when using, can determine the direction, ensure measuring head alignment to the flow direction. Held in S type pitot tube composed of two back-to-back immortal steel processing. A head for all pressure tube, on the other side for the static pressure tube. To correctly choose measurement point 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. Pitot tube to measure the diameter of the specifications and selection principles are measured pipeline diameter ratio, and is not greater than zero. 02. In order to avoid interference, make error increases. Don't let the pitot tube measurement near the pipe wall. L standard pitot tube measurement shall be the total pressure port on the airflow direction, to point to the pole, static pressure on the air flow in the vertical direction. Measurement point insertion hole should avoid air leakage, and can prevent the airflow interference on the cross section. Held in S type pitot tube to measure the total pressure hole shall be on the airflow direction, the static pressure hole facing the airflow direction according to the pipeline measurement technology specifications, choose the measuring point of the measurement section. With 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. Measuring point by flue ( Pipe) Measurement method, according to a linear logarithmic method, can also according to the commonly used uniform area. Each pitot static pressure type joint has a tag number. Calibration coefficient and identification of single should be kept for a long time, for calculation. With the digital pressure gauge of the company, the intelligent pressure anemometer or intelligent pressure air flow meter. Can direct reading of wind pressure, wind speed, air volume. Particularly recommended JX1000 - 1 f intelligent wind pressure type air flow meter Chinese LCD display, full Chinese menu operation can enter skin coefficient of pipe, air density, tuyere area. Pressure, wind speed, air volume value direct reading. In use may cause the pipe bending. Before use check once, clearly bending straightening in advance, the cone head injury, cannot be used again. A dust in the pipe after use, tube may have dust or water vapor. Methods should be used after using blowing blowing off the box. Or test before using the smooth general characteristic. After use clean the tube inside and outside, to ensure the good condition for a long time. Small static pressure hole check, don't make the impurities clogging pores, pressure. Products by Shanghai administration of metrology accreditation and the relevant units. By the Shanghai administration of standard measurement issue production licenses. Standard pitot verification period of five years.