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1. Does a small pressure difference have a relationship with flow rate?
A small pressure difference has a relationship with flow rate. Differential pressure flowmeter is an instrument for measuring flow rate. It uses the principle that there is a certain relationship between the pressure difference and flow rate when the fluid flows through a throttling device to measure the flow rate. The throttling device is a local contraction element installed in the pipeline, and the most commonly used ones are orifice nozzles and Venturi tubes. Introduction: A differential pressure flowmeter consists of a primary device and a secondary device. The primary device is called a flow measuring element, which is installed in the pipeline of the measured fluid to generate a pressure difference proportional to the flow rate (velocity) for the secondary device to display the flow rate. The secondary device is called a display instrument, which receives the differential pressure signal generated by the measuring element and converts it into the corresponding flow rate for display. The primary device of a differential pressure flowmeter is often a throttling device or a dynamic pressure measuring device. The secondary device is equipped with various mechanical and electronic combination differential pressure gauges with flow display. The differential pressure sensitive elements of the differential pressure gauge are mostly elastic elements. Due to the square root relationship between differential pressure and flow rate, flow display instruments are equipped with square root devices to linearize the flow scale. Most instruments are also equipped with flow station metering devices to display cumulative flow for economic accounting. <
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2. What are the calculation formulas for differential pressure flow meters?
Give an example to illustrate the calculation method: the differential pressure range is 0-25KPA, the output is 4-20mA, the secondary flow meter is 0-200m3/h, and the flow rate is 80100.. There are detailed calculation formulas and operating procedures:
1. Generally speaking, flow rate and differential pressure are proportional, that is, F * F=K * △ P
2. Then K=F × F/△ P=200 * 200/25=1600
3. When the flow rate is 80m3/h: △ P1=F1 * F1/K=80 * 80/1600=4KPa
4. The current output is (20mA-4mA) × 4/25+4=6.56mA
5. When the flow rate is 100m3/h: △ P2=F2 * F2/K=100 * 100/1600=6.25KPa
6. The current output is (20mA-4mA) × 6.25/25+4=8mA. Additional information: Differential pressure (pressure) transmitter is a typical self balancing detection instrument that uses the working principle of negative feedback to overcome the influence of adverse factors such as component materials and processing technology. Differential pressure transmitters are used to measure the liquid level, density, and pressure of liquids, wide grinding gases, and vapors, and then convert them into 4-20mA DC current signals for output. The JT-3051DP can also communicate with each other through the BRAIN handheld hood lifter, CENTUM CS/μ XL, or HART 275 handheld controller for setting and monitoring. Among them: Q: volumetric flow rate; α: Flow coefficient ε: beam expansion coefficient d: orifice size Δ p: pressure difference Ρ 1: fluid density3. Calculation of the relationship between pipeline pressure difference, flow velocity, and flow rate
Pressure difference at the inlet and outlet of the pipeline P=0.5-0.07=0.43M