两线制4～20mA环路供电流量显示表研究

Research of Flow Display Meter with Two-wire 4-20 mA Loop Power Supply

现场应用的流量变送器目前一般都采用两线制4～20mA环路供电,这就给仪表设计提出了低功耗的要求。文章叙述了基于PIC单片机的两线制低功耗流量显示表的设计方法。对两线制、低功耗流量显示表研制过程中的几个关键技术问题进行了讨论。

Flow transducer applied in site has generally the demand of low power because the restriction of two- wire 4--20mA loop power supply. The design of flow measurement display meter with two--wire supply & low power based on PIC microcontroller is described. Several key technique problems in developing of the flow mea- surement display meter are discussed.