Technical requirements for electromagnetic flowmeter | Measurement requirements for electromagnetic flowmeter

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1. What are the requirements for the conductivity of the medium in an electromagnetic flowmeter?

The requirement for the conductivity of the medium in an electrically excited early magnetic flowmeter is that the conductivity must be greater than 5 μ S/cm. The specific explanation is as follows: The lower limit requirement for conductivity is that the electromagnetic flowmeter operates based on Faradays law of electromagnetic induction, and the conductivity of the measured medium must be greater than 5 μ S/cm. When the threshold is below, the electromagnetic induction signal cannot be effectively generated, resulting in measurement failure. This characteristic makes it suitable for most water-based solutions, acid-base solutions, and liquid-solid mixtures containing solid particles, but not for low conductivity media such as pure oils and organic solvents. Applicable medium type: Under the condition of meeting the conductivity requirements, the electromagnetic flowmeter can measure media including general conductive liquids such as tap water, industrial water, etc. Strong corrosive liquids: such as sulfuric acid, hydrochloric acid, sodium hydroxide and other strong acid and alkali solutions. Liquid solid two-phase suspension: a homogeneous mixture such as mud, slurry, pulp, etc. Special oily liquids: Some impurity free oily liquids (such as diesel and lubricating oil) need to be measured through high-precision design, but it is necessary to confirm whether the conductivity meets the standard. Influence of conductivity stability: Although the measurement results of electromagnetic flow meters are theoretically not affected by changes in the conductivity of the medium (provided that the conductivity is within an

Technical requirements for electromagnetic flowmeter

effective range), it is necessary to avoid drastic fluctuations in conductivity in practical applications. For example, when the concentration of the medium changes and the conductivity approaches the lower limit, it may cause measurement errors or unstable signals. Relationship with other parameters: The advantage of electromagnetic flow meters is that their measurement results are independent of physical parameters such as fluid density, viscosity, temperature, and pressure, but conductivity is the only medium characteristic that must be strictly met. If the conductivity of the medium does not meet the standard, even if other parameters are ideal, accurate measurement cannot be achieved. Practical application suggestion: During the selection stage, it is necessary to confirm whether the conductivity of the medium remains above 5 μ S/cm through laboratory testing or historical data before returning lead. For media with conductivity close to the critical value (such as low concentration salt leakage water), it is recommended to choose models with stronger anti-interference ability. During long-term use, it is necessary to monitor changes in the composition of the medium to avoid measurement failure caused by a decrease in conductivity.

2. Measurement requirements for electromagnetic flow meters

Electromagnetic flow meters have strict requirements for measurement, mainly focusing on accuracy level and maximum allowable error.

. The accuracy level of flow meters is divided into several levels, namely 0.

2, 0.

5, 1.0, 1.5, and 2.5. The maximum allowable error for level 0.2 is ± 0.2%, and the level without parentheses is preferred. The maximum allowable error for each level is as follows: 0.2 le

Technical requirements for electromagnetic flowmeter | Measurement requirements for electromagnetic flowmeter

1. What are the requirements for the conductivity of the medium in an electromagnetic flowmeter?

2. Measurement requirements for electromagnetic flow meters

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