要考虑的因素很多：精度、可靠性、费用、流体特性及其他种种因素。 There are many factors to consider when choosing a flow meter that suits you: accuracy, reliability, cost, fluid characteristics, and other factors.
种类少，选择起来速度之快是可而言之的。 In the past, there were few types of flowmeters , and the speed of selection was fast enough. 的品种之繁多，选择起来就考虑更多的因素，不然只会增加烦恼。 But now that there are so many types of flowmeters on the market, you have to consider more factors when you choose them, otherwise it will only increase your troubles. Facing a large family of flow meters, if you want to choose an economical and practical
Instrumentation is not easy.
1. On-site installation conditions and environment; including: installation of accessories, length of straight pipe sections, ambient temperature, pressure, humidity, flow direction, pulsating effects, pipe diameter, installation location, electrical connection, nearby electrical interference, and vibration effects;
2. Physical and chemical properties of fluids; including: chemical properties, fluid temperature, fluid density, lubricity, liquid or gas, fluid viscosity, fluid pressure, surface tension, compression coefficient;
3. The performance of the meter, including: reliability, output signal characteristics, linearity, range, pressure drop, accuracy, response time, instantaneous or cumulative amount;
4, cost, including: purchase price, maintenance costs, calibration costs, instrument life, installation costs, operating costs, spare parts costs, operator training costs; it is impossible to weigh all the pros and cons. But when the user chooses. The final choice is often interest charges
And instrument performance!