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在石油化工厂中,中温测量大都采用工业铂热电阻。为防止因连接导线受环境温度影响而产生测量附加误差,均采取三线制接线法。国内常用的工业铂电阻的接线端如图1所示。图1中a、b系用来固定热电阻本身引线的螺钉。A、B是用来固定连接热电阻与显示仪表导线A、B、C的螺钉。一般化工厂采用线径φ=1.0mm的塑料电缆做为连接导线。这不仅能防腐蚀潮湿,而且布线简便,安全可靠。但由于线径不能太细,而B螺钉又要同时固
In petrochemical plants, most of the temperature measurement using industrial platinum thermal resistance. In order to prevent the connecting wire from being influenced by the ambient temperature, the additional error of measurement is taken. The three-wire connection method is adopted. Domestic commonly used industrial platinum resistance of the terminal shown in Figure 1. Figure 1 a, b Department is used to fix the leads of the thermal resistance itself screw. A, B are used to connect the thermal resistance and display instrument leads A, B, C screws. General chemical plant diameter φ = 1.0mm plastic cable as the connecting wire. This not only protects against corrosion and moisture, but also makes wiring easy, safe and reliable. However, because the diameter can not be too thin, but B screws at the same time solid