量仪表又称为流量计 ， 流量测量的发展可追溯到古代的水利工程和城市供水系统。 Flow meters are also called flow meters . The development of flow measurement can be traced back to ancient water conservancy projects and urban water supply systems. 、 速度式流量计 、 靶式流量计 、 电磁流量计 、 旋涡流量计 、 转子流量计 、 差压流量计 、 超声波流量计 、 质量流量计等。 The classification of flow equipment can be divided into volume flowmeter , speed flowmeter , target flowmeter , electromagnetic flowmeter , vortex flowmeter , rotor flowmeter , differential pressure flowmeter , and ultrasonic flowmeter according to the measurement principle of flow equipment. , Mass flow meters, etc. 工 程工业 、 城市公用事业对流量测量的需求急剧增长，促使仪表迅速发展，微电子技术和计算机技术的飞跃发展极大地推动仪表更新换代，新型流量计如雨后春笋般涌现出来。 Due to the rapid growth of the demand for flow measurement in energy measurement, engineering industry , and urban utilities, the rapid development of meters has been promoted. The rapid development of microelectronics and computer technology has greatly promoted the upgrading of meters, and new flowmeters have sprung up.
非常重要的 ，但是在现实生活中有太多的仪表仪表由于被测对象的复杂状况， 加之 仪表品种繁多、性能指标 繁杂使得 仪表的选型 很 困难。 When selecting a meter, it is very important to properly select the flow meter for yourself , but in real life, there are too many meters due to the complex conditions of the measured object, coupled with the variety of meters and the complicated performance indicators, which make the meter Selection is difficult. Therefore, we must choose the flow meter that is suitable for you. 三 个方面进行考虑 ： 仪表性能方面、流体特性方面、安装条件方面 。 General selection can be considered from three aspects : instrument performance, fluid characteristics, and installation conditions .
1. Instrument performance
准确度、流量范围、线性度、范围度、重复性、信号输出特性、响应时间、压力损失等； The key focus is on the accuracy, flow range, linearity, range, repeatability, signal output characteristics, response time, pressure loss, etc. of the flowmeter ;
2. Fluid characteristics
温度、压力、密度、粘度、化学腐蚀、磨蚀性、结垢、混相、相变、电导率、声速、导热系数、比热容 ； Because the fluids are different, pay attention to the temperature, pressure, density, viscosity, chemical corrosion, abrasiveness, scaling, mixed phase, phase change, electrical conductivity, sound velocity, thermal conductivity, and specific heat capacity of the fluid ;
3. In terms of installation conditions
管道布置方向，流动方向，检测件上下游侧直管段长度、管道口径，维修空间、电源、接地、辅助设备（过滤器、消气器）、安装、等； In the installation, we must also pay attention to many aspects, such as the direction of pipe layout, flow direction, length of the straight pipe section on the upstream and downstream sides of the test piece, pipe diameter, maintenance space, power supply, grounding, auxiliary equipment (filters, deaerators), installation, etc. ;