What factors should be paid attention to when purchasing an electromagnetic flow meter

Abstract: What factors should be paid attention to when purchasing electromagnetic flowmeters The information is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. How to correctly select the electromagnetic flowmeter that suits you is a very difficult problem for many buyers. Today, I will help you solve this problem. Through the following description, I think everyone will know how to select the electromagnetic flowmeter correctly. There will be a flow meter. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the factors that should be paid attention to when purchasing electromagnetic flowmeters. How to correctly select the electromagnetic flowmeter that suits you is a very difficult problem for many buyers. Today, I will help you solve this problem. Through the following description, I think everyone will know how to select the electromagnetic flowmeter correctly. The flow meter will have a very important understanding, or you can Anhui SECCO Environmental Protection Technology. There are three main industrial applications of electromagnetic flowmeters. One is that large-diameter meters are mostly used in water supply and drainage projects, and the other is that small and medium-diameter meters are often used for solid-liquid dual-phase difficult-to-measure fluids or high-demand places, such as measuring paper pulp in the paper industry. And black liquor, ore slurry in non-ferrous metallurgy industry, coal slurry in coal preparation plant, strong corrosive liquid in chemical industry, cooling water control and leakage monitoring of blast furnace tuyere in iron and steel industry, flow measurement and control of long-distance pipeline coal hydraulic transportation. The last one is that small calibers and tiny calibers are often used in places with hygienic requirements such as the pharmaceutical industry, food industry, and bioengineering. Accuracy grades and functions The flowmeters circulating in the market have different performances according to different applications and operating environments. Some of them have high precision and multiple functions, while others have low precision and simple functions. The basic error of the instrument with high precision is (±0·5%~±1%) R, the instrument with low precision is (±1·5%~±2·5%) FS, the price difference between the two is 1~2 times. Therefore, it is not economical to choose high-precision instruments in places where the measurement accuracy is not very high. Some models of meters claim to have higher accuracy, the basic error is only (±0·2%~±0·3%) R, but there are strict installation requirements and reference conditions. For example, the ambient temperature is 20~22℃, and the length of the front and rear straight pipe sections is required to be greater than 10D, 3D (usually 5D, 2D). The straight pipe is composed of one body and is calibrated on the flow standard device to reduce the influence of poor clamping. Therefore, when comparing multiple models, do not simply look at the high indicators, but read the manufacturer's samples or instructions in detail for comprehensive analysis. The functions of electromagnetic flowmeters on the market are also very different. The simple one only measures one-way flow, and only outputs analog signals to drive the rear instrument; the functional instrument has two-way flow measurement, range switching, upper and lower limit flow alarm, empty pipe and power cut off. Alarm, small signal removal, flow display and total calculation, automatic check and fault self-diagnosis, communication with upper computer and motion configuration, etc. The serial digital communication function of some models of instruments can choose a variety of communication interfaces and special chip ASIC) to connect HART protocol system, PROFTBUS, Modbus, CONFIG, FF field bus, etc. Flow rate, full-scale flow, range and caliber When choosing the caliber, choose it according to your own needs. The diameter of the selected instrument is not necessarily the same as the diameter of the pipe, and it should be determined according to the flow rate. The process industry transports liquids with different viscosities such as water, and the pipeline flow rate is generally the economic flow rate 1·5~3m/s. The flowmeter is used in such a pipeline, and the sensor diameter is the same as the pipe diameter. When the electromagnetic flowmeter is full-scale flow rate, the liquid flow rate can be selected in the range of 1~10m/s. The upper flow velocity is not limited in principle, however, it is generally recommended not to exceed 5m/s, unless the lining material can withstand the flow of fluid, practical application rarely exceeds 7m/s, and more rarely exceeds 10m/s. The lower limit of the full-scale flow rate is generally 1m/s, and some models are 0·5m/s. In some projects, the flow rate is low or the flow rate is low in the pipeline system. From the perspective of measurement accuracy, the diameter of the instrument should be changed to be smaller than the diameter of the pipe, and connected with a reducer. For fluids that are prone to adhesion, deposition, scaling, etc., the flow rate should not be lower than 2m/s, and it is better to increase it to 3~4m/s or above, which can play the role of self-cleaning and prevent adhesion and deposition. It is used for highly abrasive fluids such as ore pulp, and the usual flow rate should be lower than 2~3m/s to reduce the wear of lining and electrodes. When measuring low-conductivity liquids close to the threshold, choose a lower flow rate (less than 0·5~1m/s), the flow noise will increase due to the increase of the flow velocity, and the output sloshing phenomenon will occur. The range of electromagnetic flowmeter is relatively large, usually not less than 20, and the instrument with automatic range switching function can exceed 50~100. The premise of using electromagnetic flowmeter is that the liquid to be measured must be conductive and cannot be lower than the threshold value. If the conductivity is lower than the threshold, it will cause measurement error until it cannot be used. If it exceeds the threshold, it can be measured even if it changes, and the indication error does not change much. It also depends on the length of the flow signal line between the sensor and the converter and its distributed capacitance. The manufacturer's instruction manual usually specifies the length of the signal line corresponding to the conductivity. Meters with non-contact capacitively coupled large-area electrodes can measure conductivity as low as 5×10-8S/cm liquid. There is no problem in the use of industrial water and its aqueous solutions, acids, alkalis, salt solutions, etc.
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