In the process of measuring fluid with electromagnetic flowmeter, we all know the requirements of the basic measuring medium. But sometimes it is inevitable to encounter some more special fluids. Make the following analysis for you for uncommon fluid media.

The degree of doping of solid-state semiconductors can cause great changes in electrical conductivity. Increasing the degree of doping will cause the conductivity to increase. The conductivity of the aqueous solution depends on the concentration of the solute contained in it, or other chemical impurities that will decompose into the electrolyte. The conductivity of a water sample is an important indicator for measuring the salt, ion, and impurity components of water. The purer the water, the lower the conductivity (the higher the resistivity). The conductivity of water is often recorded as the conductivity coefficient; the conductivity coefficient is the conductivity of water at a temperature of 25°C.

There are big differences in the performance of general electromagnetic flowmeters on the market. Some have high accuracy and many functions, and some have low accuracy and simple functions. The basic error of the sanitary electromagnetic flowmeter with high precision is (±0.5%~±1%)R, and the meter with low precision is (±1.5%~±2.5%)FS. The price difference between the two flowmeters is 1~2 times. Therefore, it is not economically cost-effective to use precision instruments in places where the measurement accuracy requirements are not very high. For example, non-trade accounting is only for control purposes and only requires reliability and excellent repeatability.

Some models of hygienic electromagnetic flowmeters claim to have a basic error of only (±0.2%~±0.3%)R, but there are strict installation requirements and reference conditions, such as ambient temperature 20~22℃, front and rear straight pipe length requirements Respectively greater than 10D and 3D (usually 5D and 2D), it is even proposed that the flow sensor should be integrated with the front and rear straight pipes for real flow calibration on the flow standard device to reduce the impact of clamping. Therefore, when the selection of multiple models is relatively high, do not just look at the flowmeter indicators, but read the manufacturer's samples or instructions for comprehensive analysis.

The conductivity of industrial water and its aqueous solution is greater than 10-4S/cm, and the conductivity of acid, alkali, and salt solution is between 10-4~10-1S/cm. There is no problem in using it. Low-degree distilled water is 10-5S/cm. There is no problem with cm. Petroleum products and organic solvents cannot be used if the conductivity is too low. It is found from the data that some pure liquids or aqueous solutions have high conductivity and low conductivity and are considered unusable. However, in actual work, they may be used because they contain impurities. Such impurities increase the conductivity of the medium. For the aqueous solution, the conductivity in the data is measured in the laboratory with pure water ratio. The actual aqueous solution may be proportioned with industrial water. The conductivity will be more important than what is found, and it is also conducive to flow measurement.