Orifice flowmeter | Please consult the flow calculation formula of orifice plate flowmeter | Customized ultrasonic flowmeter manufacturer

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1. Types of central air conditioning flow meters

According to the measurement principle, central air conditioning flow meters can be mainly divided into electromagnetic flow meters, turbine flow meters, ultrasonic flow meters, orifice flow meters, volumetric flow meters and other types. Some old models such as pipeline rotor flow meters and plug-in rotor flow meters have been phased out. The electromagnetic flowmeter is based on Faradays law of electromagnetic induction, and calculates the flow rate by measuring the induced electromotive force generated when a conductive liquid flows in a magnetic field. Its core advantages lie in high precision, no movable parts, and strong adaptability, especially suitable for liquids containing corrosive media or impurities (such as circulating cooling water, chilled water). Due to no mechanical wear and tear, it has good long-term stability, but only for measuring conductive liquids. The turbine flowmeter drives the internal turbine to rotate through water flow, and the turbine speed is proportional to the flow rate, which is then converted into a flow signal through sensors. Its characteristics are fast response speed, simple structure, and low cost, but it requires high fluid cleanliness. If there are impurities in the water, it can easily cause turbine jamming or wear, affecting measurement accuracy. Therefore, it is mostly used in filtered clean water systems. Ultrasonic flow meters use the time difference or Doppler effect of ultrasonic waves propagating in fluids to measure flow rate. The time difference method calculates the flow velocity by calculating the time difference between forward and backward propagation; The Doppler rule is applicable to fluids containing

suspended particles or bubbles. Its advantages are non-contact measurement, easy installation, and low maintenance costs, especially suitable for large-diameter pipelines (such as DN150 and above) and high-precision demand scenarios, but strong electromagnetic interference needs to be avoided. The Jingyuan orifice flowmeter is installed with an orifice plate in the pipeline. When the flow sensor passes through, a pressure difference is generated, and the flow rate is calculated by measuring the pressure difference. It has a simple structure, low cost, and is suitable for large pipelines and high flow measurement. However, the pressure loss is large, and the wear of the orifice plate needs to be calibrated regularly. Moreover, the measurement accuracy is affected by fluid density and viscosity. A volumetric flowmeter determines the flow rate by measuring the number of times the fluid passes through a fixed volume chamber, such as an elliptical gear flowmeter. Its characteristics are direct measurement of volume, high accuracy, suitable for low flow scenarios (such as small flow branches of chilled water), but sensitive to fluid viscosity. High viscosity fluids may cause chamber leakage and require regular maintenance. The obsolete types of pipeline rotor flow meters (horizontal/vertical rotor type) and insertion rotor flow meters have gradually been replaced by other types due to poor reliability, large maintenance requirements, and easy blockage. For example, the magnetic components of a plug-in rotor flowmeter are susceptible to magnetic field interference, leading to measurement inaccuracies.

2. Please ask for the flow calculation formula of the orifice flowmeter

The orifice plate is composed of a thrott

Orifice flowmeter | Please consult the flow calculation formula of orifice plate flowmeter

1. Types of central air conditioning flow meters

2. Please ask for the flow calculation formula of the orifice flowmeter

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