Turbine flowmeter and electromagnetic flowmeter are both liquid flowmeters that are often used in industrial automation control. So what is the difference between the two? The following Junyuan flowmeter will introduce you:
1.The difference in working principle:
Schematic diagram of turbine flowmeter
The principle of the turbine flowmeteris shown in the figure above. A turbine is installed in the center of the flanged pipe, and both ends are supported by bearings. As the fluid passes through the pipe, it hits the turbine blades, causing the turbine to spin. The rotational angular velocity of the turbine is proportional to the fluid flow rate, and the fluid flow drives the turbine to rotate, cutting the magnetic field lines generated by the permanent magnet steel in the casing, resulting in changes in the magnetic flux. The sensing coil sends the detected magnetic flux periodic change signal to the preamplifier for amplification, generates a pulse signal proportional to the flow rate, and obtains the flow value through circuit operation.
Schematic diagram of electromagnetic flowmeter
The working principle of electromagnetic flowmeter is designed based on Faraday's law of electromagnetic induction. A pair of detection electrodes are installed on the tube wall where the axis of the measuring tube and the magnetic field lines of the magnetic field are perpendicular to each other. When the conductive liquid moves along the measuring tube in the alternating magnetic field and the magnetic field lines move in a vertical direction, the conductive liquid cuts the magnetic field lines to generate an induced potential, which is determined by Two detection electrodes on the measuring tube detect.
2. Different scope of application
Since the turbine flowmeter is equipped with a turbine in the center of the pipeline, it is not suitable for the measurement of fluids with impurities or corrosiveness. Otherwise, the turbine flowmeter will not work properly due to the adsorption/entanglement of impurities or corrosion, which will affect the service life.
The object of the electromagnetic flowmeter to measure the medium must be conductive, because the electromagnetic flowmeter can be lined (rubber, PTFE, etc.) and is also suitable for the measurement of corrosive fluids.
To sum up, the two flow meters have their own advantages and disadvantages, so how should consumers choose? If you do not have high requirements for high precision and want an affordable price, you can consider a turbine flowmeter. It is worth noting that the applicable pipe diameter of a turbine flowmeter is generally below DN200, and it may be specially customized by the manufacturer if it is more than DN200. High performance requirements, you can choose electromagnetic flowmeter.