product details

1. Concept of anti-corrosion integrated electromagnetic flowmeter:

There are three main applications of electromagnetic flow meters in industry. One is that large-diameter instruments are more commonly used in water supply and drainage engineering, and the other is that small and medium-sized instruments are commonly used in solid-liquid two-phase difficult to measure fluids or high demand places, such as measuring pulp and black liquor in the paper industry, mineral slurry in the non-ferrous metallurgy industry, coal slurry in the coal preparation plant, strong corrosive liquids in the chemical industry, and controlling and monitoring cooling water in blast furnace tuyere of the steel industry. Flow measurement and control of long-distance pipeline coal hydraulic transportation. The last one is small caliber, which is commonly used in places with hygiene requirements such as the pharmaceutical industry, food industry, biotechnology, etc.

2. Selection criteria for anti-corrosion integrated electromagnetic flowmeter:

The premise of using an electromagnetic flowmeter is that the measured liquid must be conductive and not lower than the threshold. Conductivity below the threshold will result in measurement errors until it cannot be used. Even if it changes beyond the threshold, it can still be measured with little change in indication error. When used, it also depends on the length of the flow signal line and its distributed capacitance between the sensor and the converter. The manufacturer's instruction manual usually specifies the length of the signal line corresponding to the conductivity. Instruments with non-contact capacitive coupling large-area electrodes can measure liquids with conductivity as low as 5 × 10-8S/cm. There is no problem with the use of industrial water and its aqueous solutions, acids, alkalis, salt solutions, etc. Petroleum products and organic solvents cannot be used if their conductivity is too low. According to the information, some pure liquids or aqueous solutions have low conductivity and are considered unusable. However, in practical work, there may be instances where they can be used due to the presence of impurities. For aqueous solutions, the conductivity in the data was measured in the laboratory using pure water ratio. The actual aqueous solution used may use industrial water ratio, and the conductivity will be higher than the measured value, which is also beneficial for flow measurement. The conductivity of the liquid used in practical applications should be at least one order of magnitude higher than the threshold specified by the instrument manufacturer.

3. Flow rate, full flow rate, range and caliber:

When choosing a caliber, choose according to your own needs. The selection of instrument diameter may not necessarily be the same as the diameter, and should depend on the flow rate. The pipeline flow rate for transporting liquids with different viscosities such as water in the process industry is generally the economic flow rate of 1.5~3m/s. The flowmeter is used on such pipelines, and the sensor diameter should be the same as the pipe diameter. When the electromagnetic flowmeter is at full flow rate, the liquid flow velocity can be selected within the range of 1-10m/s. The upper limit flow velocity is theoretically unrestricted, but it is generally recommended not to exceed 5m/s unless the lining material can withstand liquid flow erosion. In practical applications, it is rarely exceeded 7m/s, and exceeding 10m/s is even rarer. The lower limit of flow velocity for full flow rate is generally 1m/s, while some models of instruments have a flow rate of 0.5m/s. For some engineering projects with low flow rates or low flow rates in the early stages of operation, from the perspective of measurement accuracy, the instrument diameter should be changed to be smaller than the pipe diameter and connected with a reducer. For fluids with substances that are prone to adhesion, sedimentation, scaling, etc., the flow rate should not be less than 2m/s, preferably increased to 3-4m/s or above, to achieve self-cleaning and prevent adhesion and sedimentation. For highly abrasive fluids such as slurry, the commonly used flow rate should be below 2-3m/s to reduce wear on the lining and electrodes. When measuring low conductivity liquids close to the threshold, it is advisable to choose a lower flow rate (less than 0.5~1m/s) as much as possible. As the flow rate increases, the flow noise will increase, resulting in output shaking. The range of electromagnetic flowmeter is relatively large, usually not less than 20, and instruments with automatic range switching function can exceed 50-100.

4. Installation diagram: