First, the accuracy level. The accuracy level of the water flow sensor is usually high, and the higher the accuracy, the more sensitive the environment is. From the perspective of economic efficiency, do not blindly seek high levels of precision. In the case of large-caliber flow, for example, in the West-East Gas Pipeline Project, high-precision sensors should be selected, and in the case where the amount of transportation is small and measurement is required, the usual turbine flow sensor can be selected.
Second, density. The stability of the density has a great influence on the measurement accuracy of the water flow sensor. In the case of changing the density frequently, it is necessary to adopt the method of correcting the flow coefficient, especially regarding the low flow area.
Third, the scale of traffic. The selection of the flow rate of the water flow sensor directly affects its accuracy and service life, and it also determines the selection of the flow sensor. The selection of the flow scale is usually based on the following principle: the minimum flow rate should be greater than or equal to the minimum flow that the external surface can measure, and the maximum flow rate should be less than or equal to the maximum flow that the external surface can measure; for the case where the uninterrupted operation is less than eight hours, the maximum flow rate should be the maximum flow rate in practice. About 1.3 times; for the case where the uninterrupted operation exceeds eight hours, the maximum flow rate should be 1.4 times of the maximum flow rate of practice; the minimum flow rate should be 0.8 times the minimum flow rate of practice, and the pressure is lost. The smaller the pressure loss, the smaller the energy consumption of the gas during the activity, which can save energy, reduce the cost of transportation, and improve utilization. Therefore, at the time of selection, try to select a turbine flow sensor with low pressure loss. Typically, the turbine flow sensor using a semi-ellipsoidal front deflector has less pressure loss than the turbine flow sensor of the cone's front deflector.
Fifth, the layout method. The layout method uses the above three methods to determine: the internal layout uses the reverse thrust turbine flow sensor. Because the layout can make the impeller in a floating state within a certain flow scale, there is no contact point in the axial direction, no end conflict and wear, and the bearing can be extended. The service life of the flow sensor for the horizontal layout device can be flange connection, thread connection and clamp connection; the flow sensor for the straight layout device can only use the thread connection
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