The flow measuring instrument itself is affected by many factors, and the selection should be rationally selected according to factors such as fluid working conditions, installation requirements, environmental conditions, and economics. Bag Filter,Water Pipe Bag Filter,Liquid Filter Large Filter,Barrel Filter Area Filter Wenzhou suote pharmaceutical and chemical engineering CO.,LTD , https://www.wzsuotejixie.com
1. Fluid properties. Different fluid media have different characteristics, and fluid properties mainly refer to fluid composition, temperature, pressure, viscosity and the like. According to the actual situation, gradually confirm the selection range. First, from the component analysis, it is known that the fluid is liquid, gas, steam, dirty dirt, etc., and the appropriate flow type is selected. Secondly, according to the flow range of the fluid, the pressure change, and the density of the fluid, the flowmeter model is judged. Any change in the fluid parameters will affect other parameters, such as the viscosity of the fluid, which is affected by temperature and pressure. It is important to understand the accuracy of the fluid properties.
2. Security performance. Industrial products must be safe. If the medium to be measured is high temperature and high pressure, high temperature and high pressure resistant products must be selected. If the corrosive medium is measured, the appropriate lining material must be selected according to the corrosive strength. The environment of the flammable gas should be an explosion-proof type instrument.
3. Energy saving. The pressure loss before and after the fluid passes through the flow meter, the smaller the pressure loss value, the better the energy saving.
4. Process parameters. Select the model and specifications of the instrument according to the process parameters. The process parameters are the final basis for determining the specific model and specifications of the instrument. The process parameters should be detailed and clear. If there are slight errors, the measurement data of the instrument will be inaccurate or even impossible to use.
5. Accuracy and economy. The flow measurement system is required to have small error, high accuracy level, good repeatability and wide range ratio. Generally, the flowmeter with relatively stable performance, good repeatability, long service life and wide range-to-range ratio is beneficial to increase the measurement parameter adjustment of the process equipment in the later stage, thereby reducing investment. The flowmeter with high system precision has a relatively high price, and within the scope of ensuring the accuracy of the process requirements, the comprehensive maintenance cost is comprehensively selected. The calibration of the flowmeter is very important. Since most of the flowmeters have flow coefficient and gauge constants that are physically calibrated, the data of the calibration coefficient directly affects the accuracy of the operating parameters. Therefore, it is necessary to select the manufacturing unit capable of performing physical calibration. .
6. Installation environment. The on-site installation environment mainly refers to measuring the diameter of the pipe, the length of the straight pipe section, whether the pipe is vibrating, whether there is strong magnetic field interference and high temperature radiant heat.
7. Media conditions. Special attention should be paid during the production process. The flow direction of the fluid may change. In some processes, the fluid flow will change temporarily. If there is a change, a series of measures should be taken to prevent it. You can consult the flowmeter manufacturer for guidance.