The fluid filled with the pipeline, when they flow through the throttling device inside the pipeline, the flow stream will form a partial contraction at the throttling member of the throttling device, so that the flow velocity will increase, the static pressure will be low, and then it will be generated before and after the throttling device. Pressure drop, pressure difference, the greater the flow of medium flow, the greater the pressure difference between before and after the throttle, so the orifice flow meter can measure the fluid flow by measuring the pressure difference. This measurement method is based on the law of energy conservation and the law of continuity of flow.
1. The straight section before and after the throttle must be straight and must not be bent by the naked eye.
2. The straight pipe section used for installing the throttle should be smooth. If it is not smooth, the flow coefficient should be multiplied by the roughness correction sparse.
3, in order to ensure the flow of fluid in the 1D before the throttle to form a fully developed turbulent velocity distribution, and make this distribution into a uniform axis symmetry, the straight section must be round, and the front 2D range of the throttle Its roundness requires that it be very strict and has a certain degree of roundness.
The specific measurement method is to measure the diameters of at least four pipe inner diameters at the OD, D/2, D, and 2D vertical pipe sections of the throttling piece at a maximum to equal angular distance, and take the average value D. The difference between the single measurement value and the average value of the arbitrary internal diameter shall not exceed ±0.3%; after the throttle, the 8 internal diameters measured at the OD and 2D positions are measured by the above method. The maximum deviation of any single measured value is compared with D. Not to exceed ±2%;
A lengthy straight section is required before and after the throttle. The length of the straight section and the local resistance in front of the throttle are related to the diameter ratio β. The length of the straight pipe section between the first resistance element and the second resistance element on the upstream side of the throttling element may be taken as 1/2 of the listed value in terms of the second resistance element and β = 0.7 (regardless of the actual beta value);
4. When the upstream side of the throttle is an open space or a large container with a diameter ≥ 2D, the straight length between the open space or large container and the throttle must not be less than 30D (15D). If there is any other local resistance between the throttle and the open space or large container, except from the open space to the joint, the length of the minimum straight pipe section 1 is provided between the throttle and the local resistance. The total length of straight sections between flow elements must not be less than 30D (15D).
5, connect the signal line, power line
6, open the import, export valve, import and export valve opening to be consistent
7. Open the stainless steel three-valve bank balance valve, slowly open the valve at the high and low pressure side of the orifice plate, and close the stainless steel three-valve bank balance valve after the fluid passes through the flow meter.
Features â–² orifice plate flow meter throttle device structure is easy to copy, simple, solid, stable and reliable performance, long life, low prices.
â–² Orifice plate calculation adopts international standards and processing â–² Orifice plate flowmeter has a wide range of applications, all single-phase flow can be measured, and part of the miscible flow can also be applied.
â–² The standard throttle device can be used without real-time calibration.
â–² orifice plate flow meter installation is simpler, no pressure tube can be directly connected to the differential pressure transmitter and pressure transmitter.
Intelligent orifice flowmeter features â–² imported single crystal silicon smart differential pressure sensor â–² high precision, complete self-diagnostic function â–² smart orifice flowmeter smart orifice flowmeter its range can be self-programming adjustment.
â–²Smart orifice flowmeter can display total flow, instantaneous flow, pressure, and temperature at the same time.
â–² With on-line and dynamic full compensation function, the intelligent orifice flowmeter also has self-diagnosis and self-setting range.
â–² Equipped with a variety of communication interfaces â–² High stability â–² Wide range, greater than 10:1
Smart Orifice Flowmeter Specifications ▲ High Accuracy: ± 0.075%
â–² High stability: better than 0.1% FS/year â–² high static pressure: 40MPa
â–²No need to adjust for 5 years of continuous work â–²Can ignore the effect of temperature and static pressure â–²Anti-high overpressure