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1. Calculation method for flow rate of differential pressure transmitter
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 in an open and closed relationship, 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 wide grinding (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, gases, and vapors, and then convert them into 4-20mADC current signals for output. JT-3051DP can also communicate with each other through the BRAN controller, CENTUMCS/μ XL, or HART275 controller for setting and monitoring purposes. Among them: Q: volumetric flow rate; α: Flow coefficient ε: beam expansion coefficient d: orifice size Δ p: pressure difference cover lift Ρ 1: fluid density2. Flow calculation method
Flow calculation method Flow calculation is a fundamental problem in fluid mechanics, usually calculated using different formulas based on known conditio
First, flow calculation based on flow velocity and cross-sectional area. The most basic flow calculation formula is the relationship between flow rate (Q), flow velocity (v), and cross-sectional area (A): [Q=A cdot v] (Q) is the volumetric flow rate, usually measured in cubic meters per second (m ³/s) or liters per minute (L/min). (A) It is the cross-sectional area of the pipeline, measured in square meters (m ²). For circular pipes, the cross-sectional area (A) can be calculated by the pipe diameter (D): (A=pi left (frac {D}) {2}right ）^2) . (v) It is the average flow velocity, measured in meters per second (m/s). This method is applicable when the cross-sectional area and flow velocity of the pipeline are known.
2. Using Reynolds number to determine flow type Before calculating flow rate, it is sometimes necessary to first determine the flow type of the fluid (laminar or turbulent), as different types of flow have an impact on friction loss and flow rate calculation.
. Reynolds number (Re) is used to determine the flow type: [Re=frac {rho cdot v cdot D} {mu}] (rho) is the fluid density, measured in kilograms per cubic meter (kg/m ³). (v) It is the velocity of a fluid, measured in meters per second (m/s). (D) It is the characteristic length (such as the diameter of a circular tube), measured in meters (m). (mu) is the dynamic viscosity, measured in Paschal seconds (Pa · s). Based on the Reynolds number, it is possible to determine whether the flow is laminar or turbulent. Generally speaking, when the Reynolds number is low, it is laminar flow, and when it is high, it is turbulent flow. 3. Using the Bernoulli equ
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