Things to note when choosing a flow meter
： 有的精度高、功能多 ； 有的精度低、功能少。 According to different applications and different use environments, the performance of general-purpose electromagnetic flowmeters circulating in the market differs greatly : some have high accuracy and many functions ; some have low accuracy and few functions. ( ± 0 . 5%~ ± 1%)R, 精度低的仪表则为 ( ± 1 . 5%~ ± 2 . 5%)FS, 因此 两者的价格基本上会相差 1-2 倍。 The basic error of a high-precision meter is ( ± 0.5% to ± 1%) R, and the low-precision meter is ( ± 1.5% to ± 2.5%) FS, so the price of the two will basically differ. 1-2 times. Therefore, there is no need to choose high-precision instruments with high measurement accuracy in places that are not very demanding, which is not economical.
, 基本误差仅 ( ± 0 . 2%~ ± 0 . 3%)R, 但是它却有着严格的安装要求和参比条件 , 例如环境温度 必须在多少度之间 , 前后置直管段长度要求也比较精确，为了减少夹装不完善的影响，有的还要求流量传感器要与前后置直管组成一体，在流量标准装置上作实流校准。 There are also models on the market that show higher accuracy, and the basic error is only ( ± 0.2 % to ± 0.3 %) R, but it has strict installation requirements and reference conditions , such as how much the ambient temperature must be In order to reduce the impact of imperfect clamping, some require the flow sensor to be integrated with the forward and backward straight pipe to perform real-flow calibration on the flow standard device. , 还 要详细阅读制造厂的样本或者使用说明书来做综合分析。 Therefore, when comparing multiple models, do not simply look at high indicators , but also read the manufacturer's samples or instruction manuals for comprehensive analysis.
, 有的就是简单的测量单向流量 , 只输出模拟信号带动后位仪表 ； 功能仪表有测双向流，上下限流量报警，量程切换，空管和电源切断报警，自动核对和故障自诊断，小信号切除，流量显示和总量计算，与上位机通信和运动组态等等。 The functions of electromagnetic flowmeters on the market are also very different . Some are simple measurements of unidirectional flow , and only output analog signals to drive the rear instrument . Functional instruments have two-way flow measurement, upper and lower limit flow alarms, range switching, empty pipe and Power off alarm, automatic check and fault self-diagnosis, small signal removal, flow display and total calculation, communication with upper computer and motion configuration, etc. , 以连接 HART 协议系统，现场总线等。 Some models of serial digital communication functions can use a variety of communication interfaces and special chips to connect HART protocol systems, field buses, etc.
The types of flow meters sold by Jiangsu Jinhu Dongxiang Instrument are: electromagnetic flow meters Balanced flowmeter Turbine flowmeter Vortex flowmeter orifice plate flowmeter, etc.