Why can't magnetic inductive flow meters be used for flow measurement of lubricating oil?

Time: 2024-07-25
Equipment Configuration:Magnetic inductive flowmeter

Magnetic inductive flow meters cannot be used for lubricant flow measurement because they require the measured medium to be electrically conductive. Lubricating oil is a non-conductive medium and lacks the necessary conductivity to generate a sufficient electrical signal, resulting in inaccurate measurements. Other types of flow meters such as turbine, gear or mass flow meters are often used for measurement.

Project Overview

Magnetic inductive flowmeters cannot be used to measure the flow of lubricating oil. The main reason is the conductivity of lubricating oil. The working principle of the magnetic inductive flowmeter is based on Faraday's law of electromagnetic induction, which requires that the measured medium must have a certain conductivity. When a conductive fluid passes through a magnetic field, a voltage signal proportional to the flow rate is generated, allowing the flow rate of the fluid to be calculated.

However, as a typical non-conductive or low-conductive medium, lubricating oil is mainly composed of hydrocarbon substances. There are very few free charges in these substances and they are almost non-conductive. Because magnetic inductive flowmeters rely on the conductivity of the fluid to generate the induced electromotive force required for measurement, they cannot work effectively in non-conductive media such as lubricating oil. Lack of the necessary conductivity means that a sufficient electrical signal cannot be generated, making measurements inaccurate or even impossible.

Therefore, for flow measurement of non-conductive liquids such as lubricating oil, other types of flow meters are usually used, such as turbine flow meters, gear flow meters or mass flow meters. These flow meters do not rely on The conductivity of the medium is measured.

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