Selection of Flow Meter Caliber

The selection of the caliber of the electromagnetic flowmeter should be reasonably selected according to the flow velocity and flow rate. It does not have to be the same caliber as the process pipeline. It is generally selected in the occasion where the flow signal is strong and the instrument can work stably for a long time. The liquid flow rate of the electromagnetic flowmeter at full flow is usually selected in the range of 0.5-10m/s, generally not exceeding 15m/s, according to the caliber-flow rate-flow relationship chart and referring to the actual working conditions. The upper limit flow rate is not limited in principle because the instrument resistance loss is very small, but it is usually recommended not to exceed 5m/s unless the lining material can withstand fluid erosion. Generally used for measuring fluids with low viscosity such as water, the flow rate should be between 1 and 3m/s. For flow measurement of fluids that are easy to adhere, deposit, scale, etc., the flow rate should be not less than 2m/s, and it is best to increase it to more than 34m/s, so as to play a role in self-cleaning pipelines to a certain extent and prevent adhesion and deposition. When used for abrasive fluids (such as ore pulp, clay, lime milk, etc.), the common flow rate should not be higher than 2m/s to reduce wear on the lining and electrodes. When used to measure low conductivity liquids close to the threshold, a lower flow rate of 0.5-1m/s should be selected as much as possible. As the flow rate increases, the flow noise will increase, resulting in output shaking.