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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 density2.1 minutes to understand the difference between balance flowmeter and orifice flowmeter
The core difference between balance flowmeter and orifice flowmeter lies in their working princ
1. Working principle Balance flowmeter: Designed based on the energy balance positive roll principle, it belongs to a new type of differential pressure flow instrument. Through unique Reynolds number design, increased thickness of throttling components, and high-precision machining, the fluid flow performance approaches that of a Venturi tube, resulting in a concise structure and significantly improved performance. Orifice flowmeter: It calculates the flow rate by measuring the pressure difference generated when the fluid flows through the orifice plate. The pressure difference is proportional to the flow rate and is a typical conventional differential pressure flowmeter.
2. Structure and Composition Balance flowmeter: It consists of a pipeline and a flowmeter body, and contains a porous disk throttling rectifier (balance flow sensor) inside.
. The size and distribution of the holes on the disc are customized based on special formulas and test data, known as function holes, to ensure a stable flow field when the fluid passes through. Orifice flowmeter: It consists of a circular plate and a central hole. The circular plate is installed at the center of the pipeline, and the hole is located at the center of the plate surface. The types include standard type, notch type, or convex type, with a simple and fixed structure.III. Performance Characteristics Balance flowmeter: High temperature and high pressure resistance: Working temperature can reach 550 ℃, pressure can reach 42MPa, suitable for extreme working conditions.
. Low demand for straight pipe sections: The flow field is stable and the pressure