温度传感器通常按照输出信号分类,有输出电阻信号、电流信号、电压信号、数字信号如485等几种。
常用的电阻信号温度传感器有正温度系数和负温度系数两种,正温度系数常用的是铂电阻温度传感器,负温度系数常用的是热敏电阻。
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PT100铂电阻温度传感器
电流信号常用的温度变送器输出4-20毫安信号,电压0-5V、0-10V都比较常见,输出485信号也就是总线温度传感器,输出数字信号的还有DS18B20等温度传感器。
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输出电压信号温度传感器
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输出电流信号温度传感器
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输出485信号总线温度传感器
温度传感器的选型要根据后端电路,温度传感器的输出信号要和采集器或者显示表的要求匹配。