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『Simulated flowmeter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1... The number of quantity and analog modules, such as one submersible pump controlled by a frequency converter through a flow meter ..
1, First, we need to count the number of points in this system, such as switch input/output and analog input/output; 2. Choose a reasonable PLC based on the number of points counted by the PLC system, and it is generally best to retain a 20% margin for the total number of digital and analog quantities; 3. If the answer is only to achieve pure start stop, flow rate, and the system is not large, it can be calculated as follows: a pump starts and stops at DO2 points, DI3 points, and the flow rate is read at AI1 point, which is simple to calculate. If manual/automatic control is also added, a pump can be calculated at 7 points (DI4, DO3); AI 2 points (traffic frequency conversion yesterday), AO 1 point; 4. A digital quantity of 8IN/8OUT is sufficient, and an analog quantity of 2IN/2OUT is also sufficient For your reference!
2. Usage of flowmeter
The use of flowmeter should be combined with its type, measurement principle and specific working conditions. The following are the general usage methods and key processes:
1. Clarify the measurement requirements and select the measurement object: confirm the fluid type (gas, liquid, steam, slurry, etc.), medium characteristics (corrosive disturbance, viscosity, temperature, pressure).
. For example, electromagnetic flow meters are suitable for conductive liquids, while turbine flow meters are suitable for low viscosity clean liquids. Measurement range: Determine the flow range according to process requirements to avoid measurement errors or instrument damage caused by exceeding the measurement range. For example,_600x400.jpg)
2. Classification selection and principle adaptation. Classification based on structural principle: Volumetric flowmeter: calculates flow rate by measuring the number of times the fluid fills and discharges a fixed volume, suitable for high viscosity fluids (such as lubricating oil).
. Differential pressure flowmeter: Based on Bernoullis theorem, a pressure difference is generated through a throttling device to measure flow, which needs to be used in conjunction with a differential pressure transmitter. Turbine flowmeter: It uses fluid to drive the turbine to rotate, and the speed is proportional to the flow rate. It needs to be calibrated regularly to avoid wear and tear affecting accuracy. Electromagnetic flowmeter: Based on Faradays law of electromagnetic induction, it is suitable for conductive liquids such as water and acid-base solutions. When installing, it is necessary to ensure that the pipeline is full. Vortex flowmeter: using the principle of fluid oscillation, measuring flow rate by detecting vortex frequency, suitable for steam, gas, and low viscosity liquids. Classified by measurement purpose: Flow measurement: Real time display of instantaneous flow rate (such as L/s, m ³/h), suitable for process control. Total measurement: Accumulate the total flow over a period of time (such as m ³), suitable for trade settlement or inventory management.