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『Cumulative measurement of flow meter』Related information(v cone flow meter|rotary gas meter|gallon meter|gear meter|metal tube rotameter|glass tube rotameter|nutating disk meter|transit time ultrasonic flow meter|wedge flow meter|pd meters|hydraulic flow meter|ultrasonic water flow meter|water flow meter|air flow meter|magnetic water flow meter|oxygen flow meter|gas flow meter|argon flow meter|air velocity meter|gasoline flow meter|fuel flow meter|ultrasonic water meter|digital water meter|nitrogen flow meter|solid flow meter|Oxygen tank flow meter|digital water flow meter|diesel fuel flow meter|steam flow meter|02 flow meter|compressed air flow meter|oil flow meter|liquid flow meter)
Which senior knows how to use a rotor flowmeter to measure the cumulative gas flow rate?
The method of measuring gas cumulative flow using a rotary flowmeter is as follows: Understand the basic principle of a rotary flowmeter: a rotary flowmeter measures flow by changing the flow area.. When the fluid flows through the conical tube, the float is impacted by the fluid and rises until the weight of the float in the fluid reaches equilibrium with the force acting on the float by the fluid. At this point, the float remains at a certain height, which corresponds to the flow rate value. Read instantaneous flow rate: Observe the position of the float on the rotor flowmeter and directly read the current instantaneous flow rate value from the instrument scale. Consider the influence of fluid density and make corrections: For gas flow, as the density of the gas can affect the measurement results, it is necessary to obtain the correction factor value based on the formula for calculating the density of the dry gas. Multiply the flow rate value read on the instrument scale by the correction factor value to obtain the measured gas flow rate value. If the measured gas is a wet gas, it is necessary to use the density calculation formula of the wet gas to correct it. Calculation of cumulative flow rate: To obtain the cumulative flow rate of gas, the integration method can be used. Accumulate the instantaneous flow values of each time period to obtain the total flow. In practical operation, it can be achieved by recording the traffic values for each time period and using a calculator or computer for accumulation. Attention: When using a rotor flowmeter to measure gas flow, it is important to ensure that the viscosity of t
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2. The problem of using pulse output signals to calculate cumulative flow rate in E+H electromagnetic flow meters
Firstly, please take a look at the cumulative flow rate displayed by the flow meter. There are generally three ways of accumulation: positive accumulation (only accumulating positive values), balanced accumulation (positive flow addition, negative flow decrease), and negative accumulation (only accumulating negative values). If the flow meter displays balanced accumulation, there will be a deviation in cumulative flow rate when there is backflow.
. The pulse hole only outputs positive accumulation. Secondly, set the pulse width high, use a multimeter to directly measure the number of pulses, and compare it with the flowmeter and PLC to see if there is any pulse loss phenomenon.3. Calculation of Accumulated Flow
Collect this flow at a fixed frequency. If the collection frequency is 10hz, which means that Shizhiying collects 10 times per second, accumulate the data collected each time, and then divide the accumulated number of clusters by 10 to obtain the flow rate per second. If the flow meter works at the maximum flow rate, we assume that the value corresponding to 20ma is 65535 (usually PLC analog quantities do not have such high accuracy, and the exact value depends on th