Magnetic inductive flowmeter conductivity requirement

Project Overview

The conductivity requirements of magnetic flow meters are a key factor in ensuring their measurement accuracy and stability. The following is a detailed explanation of the conductivity requirements for magnetic flow meters:

• 1. Basic conductivity requirements:Electromagnetic flowmeter requires that the measured medium must be electrically conductive, and its conductivity cannot be lower than the lower limit value. Usually, the lower limit value of electromagnetic flowmeter is between 10-4 and (5×10-6) S/cm. This means that only when the conductivity of the medium is higher than this range, the electromagnetic flowmeter can effectively perform flow measurement.
• 2. Effect of conductivity on measurement accuracy:The higher the conductivity, the smaller the measurement error of the electromagnetic flowmeter; conversely, the lower the conductivity, the larger the measurement error. This is because changes in the conductivity of the liquid will affect the characteristic impedance of the liquid, which will lead to a deviation in the measured magnetic induction strength and the measured value.
• 3. Conductivity requirements for different application scenarios:For liquids such as sewage, slurries, acid and alkali liquids, seawater, etc., the conductivity is usually required to be higher than 0.1S/m (or the corresponding conversion value) to ensure that the electromagnetic flowmeter can measure accurately.For gases such as gas, oil, natural gas, etc., higher conductivity requirements are needed due to their weaker electrical conductivity, which is usually required to be higher than 10^-6 S/m.
• 4. Relationship between conductivity and impurity content:Impurities in the liquid, such as iron oxide, silicates, etc., will reduce the conductivity of the liquid, thus affecting the measurement results of the electromagnetic flowmeter. Therefore, in practical applications, you need to pay attention to the purity of the liquid and the content of impurities.

In the purchase of electromagnetic flowmeter, you need to consider the conductivity of the measured liquid as well as other factors (such as temperature, pressure, chemical composition, etc.), choose the appropriate electromagnetic flowmeter model.Different electromagnetic flowmeters may have different conductivity requirements, so in practice, it is necessary to refer to the technical specifications and selection guidelines provided by the manufacturer.