Selection method of electromagnetic flow meter

Abstract: The information on the selection method of electromagnetic flowmeters is provided by excellent flowmeter and flowmeter manufacturers. Electromagnetic flowmeters are used to measure the volume flow of conductive liquids in pipes. The premise of choosing electromagnetic flowmeters is that the medium must have sufficient conductivity. The standard type meter requires that the medium conductivity is not less than 10US/cm, and the low conductivity type meter has the conductivity of the medium on the side. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the selection method of electromagnetic flowmeters. Electromagnetic flowmeters are used to measure the volume flow of conductive liquids in pipes. The premise of choosing electromagnetic flowmeters is that the medium must have sufficient conductivity. The medium conductivity of the standard type instrument is required to be no less than 10US/cm, the medium conductivity of the low-conductivity type instrument is no less than 0.1us/cm, and the flow signal transmission cable of the low-conductivity type instrument needs to be a double-core double-shielded cable. . (1) Selection of range The selection of transmitter range is very important to improve the reliability and measurement accuracy of the electromagnetic current meter. The range can be determined according to the principle of not less than the maximum flow value. When the common flow rate exceeds 50% of the upper limit of measurement, the measured value of the upper limit of the flow rate is set on the converter. The converter has three options: single range, dual range and variable range. (2) Selection of caliber The caliber of the transmitter can be the same as the diameter of the pipeline, or slightly smaller. If the range is determined, the diameter of the transmitter can be determined according to different measurement objects and the fluid in the pipeline on the transmitter side. Determined by the flow rate. Under the general conditions of use, the flow rate is 2-4m/s is the most suitable. However, in some occasions, the flow rate can reach 10m/s. If the flow rate is determined, the inner diameter of the transmitter's pipeline can be determined according to the following formula. When the medium has abrasion damage to the lining or the sediment is easy to adhere to the electrode, it can be considered to change caliber. When the medium wears the lining, the diameter of the transmitter can be increased to keep the flow rate below 3m/s, and a protective flange can be installed; when the medium is prone to produce sediment and adhere to the electrode, the diameter of the transmitter can be reduced to make the flow rate less than 3 m/s. above 2m/s. (3) Selection of pressure According to industrial production requirements, the working pressure of electromagnetic flowmeters currently produced is: 1) 1.6MPa for those with a diameter smaller than Ф50mm; 2) 1.0MPa for those with a diameter of Ф80mm-Ф900mm; 3) for those with a diameter greater than Ф1000mm 0.6MPa, (4) Selection of use temperature The temperature of the measured medium cannot exceed the allowable use temperature of the lining material. (5) Selection of lining materials The selection of lining materials should consider factors such as medium temperature, corrosion and wear conditions. PTFE lining is used for high temperature and strong corrosion measurement occasions, and the working temperature can reach up to 190 ℃. It is especially suitable for side children of acid, alkali, salt and high temperature medium, but it cannot be used for occasions where negative pressure is generated. Rubber lining is used for fluids with lower temperature and less corrosiveness, such as water, sewage, weak acid and weak alkali, etc. The working temperature is lower than 80℃. The polyurethane rubber lining has the best wear resistance, especially suitable for more sediment. The fluid and solid-liquid two-phase slurry, the working temperature is below 80 ℃. (6) Selection of electrode materials The corrosion and wear conditions of the medium should be considered when selecting electrode materials. Stainless steel: It has corrosion resistance in weak oxidizing environment, usually used for water, organic acid (acetic acid, lactic acid), weak base (ammonia), etc. Iron: It has corrosion resistance in oxidative environment, especially can be used in the environment where iron ions exist, used in seawater and various chemical solutions (grain, potassium), etc. Bearing: It has corrosion resistance in strong oxidizing and strong reducing environments, but cannot be used for alkalis, hydrofluoric acid, oleum, and is used for concentrated hydrochloric acid, sulfuric acid, nitric acid, aqua regia, etc. Wrong: Corrosion resistance to alkalis and acids without ions, used for concentrated alkali, sulfuric acid, nitric acid, etc. Corrosion-resistant and heat-resistant nickel-based alloy B: It has corrosion resistance in non-oxidizing environments, especially hydrochloric acid and hydrofluoric acid, and is suitable for hydrochloric acid, hydrofluoric acid, etc. Corrosion-resistant and heat-resistant nickel-based alloy C: used in moderately oxidizing and reducing environments, suitable for various organic acids, inorganic acids and alkalis. Platinum-iridium alloy: Corrosion resistance to all acids and alkalis except aqua regia, but expensive, used in phosphoric acid, fluoric acid, hydrochloric acid, sulfuric acid, nitric acid and alkalis. Stainless steel coated tungsten carbide: Due to the high hardness of tungsten carbide, it has good wear resistance and is used for fluids containing more sediment and solid-liquid two-phase slurries. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Selection method of electromagnetic flow meter'
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