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Introduction and use of Pitot tube flowmeter
Pitot tube flowmeter is a differential pressure flowmeter that uses the pitot tube principle to extract the fluid flow velocity at the center of the p
Product details
The Pitot tube flowmeter is a differential pressure flowmeter that uses the pitot tube principle to extract the fluid velocity at the center of the pipeline (total pressure static pressure=dynamic pressure) and convert it into fluid volume flow rate and mass flow rate.
Introduction:
The Pitot tube flowmeter is a differential pressure flowmeter that uses the pitot tube principle to extract the fluid flow velocity at the center of the pipeline (total pressure static pressure=dynamic pressure) and converts it into fluid volume flow rate and mass flow rate. The pitot tube principle has been widely used in the aerospace industry for a long time
In the middle. For example, testing and inspection of aircraft wind tunnels, aerodynamic testing of aircraft engines, speed measuring rods for aircraft flight speed, etc.
The Pitot tube flowmeter inserts the probe into the center of the pipeline, with the total pressure hole facing the incoming direction of the positive fluid and the static pressure hole facing the outgoing direction of the positive fluid. The difference between the total pressure and static pressure is the measured differential pressure at the center of the pipeline, which is then fitted to the wind tunnel calibration curve of the probe
Calculate the fluid flow rate based on the standard differential pressure at this point. At the same time, a pressure transmitter is required to measure the fluid pressure, and a thermal resistance thermometer is used to measure the fluid temperature. The standard differential pressure signal, pressure signal, and temperature signal are simultaneously introduced into the unit
The flow integrator composed of a chip machine or directly connected to the DCS system, on the one hand, solves the flow equation of the probe, and on the other hand, compensates for the pressure and temperature of the steam to ensure measurement accuracy, and displays the differential pressure, pressure, and temperature digitally
Instantaneous flow rate, cumulative flow rate, heat, speed and other parameters.
Performance characteristics:
Energy saving: Due to the fact that the intelligent probe of the measuring element is made of Φ 20mm stainless steel, its cross-sectional area is very small and there is almost no pressure loss in the medium pipeline, which greatly reduces the operating cost. Compared with throttling devices such as orifice plates, it has obvious energy-saving effects
Fruit. It is the 061 energy-saving product recommended by the National Development and Reform Commission.
◆ High temperature and high pressure resistance: The intelligent probe of the primary component is made of 1Cr18Ni9Ti stainless steel (special steel is selected according to different media), which can withstand a maximum temperature of 650 ℃ and a maximum pressure of 32MPa for the media.
◆ High reliability: Due to the simple structure and reasonable design of the probe, the medium inside the pressure tube does not flow and debris is not easy to enter, so it can maintain measurement accuracy for a long time.
◆ Easy installation: Simply drill a suitable hole in the pipeline and insert the primary component probe into the center of the pipeline for easy installation.
◆ Maintenance free: The primary measuring element probe itself does not require maintenance, only the zero and full calibration of the differential pressure transmitter according to the regular calibration requirements of the measuring instrument, as well as the calibration of the corresponding current input of the secondary meter.
Wide measurement range: Accurate measurement is possible for flow rates ranging from 0.2 t/h to 50000 t/h. The measurement effect is particularly good for low flow rate, small flow rate, and large pipe diameter.
Widely used for measuring gas, steam, and liquid flow rates. Gas: primary wind speed (quantity), secondary wind speed (quantity), (negative pressure) air, oxygen, hydrogen, dry gas, coal gas (converter gas, blast furnace gas, coke oven gas), daily
Natural gas, liquefied gas, flue gas, chemical material gas, etc; Steam: superheated steam, saturated steam, wet steam, bidirectional steam, etc; Liquids: water, unfilled water, light oil, tar, crude oil, various solutions, chemical material liquids, etc.
The cross-sectional shape of the medium pipeline is widely applicable: This flowmeter has no requirements for the geometric shape of the medium pipeline cross-section, and is suitable for circular, elliptical, square, rectangular, angular, triangular, trapezoidal, etc.
◆ No requirement for straight pipe section: Tsinghua University has accumulated a database of correction factors between bent pipe sections and 15 times the pipe diameter under various working conditions through decades of wind blowing experiments. As long as the user provides the length of the straight pipe section, the accuracy can be guaranteed even when installed at the bent pipe.
Equipped with intelligent secondary instruments: capable of displaying various parameters and remote communication, forming a network for centralized management. The Pitot flowmeter is the most advanced flow measurement instrument at home and abroad, and foreign instrument companies have published it on their websites
Identify and promote the Bi managed flowmeter.
The use of Pitot tube flowmeter:
1. Connect the two joints on the pitot tube to the two ends of the plastic tube at will.
2. Before inserting, check if the water level inside the plastic tube is balanced. After confirmation, insert the probe into the pipeline in the direction of the gas flow, that is, the front probe is parallel to the gas flow.
3. Place the plastic tube and ruler vertically, with the eyes looking at the liquid level. The difference in liquid level between the two plastic tubes is the pressure difference, and multiplying this value by ten is the dynamic pressure (pa).
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