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本文介绍一种适用于工农业自动控制用的温度测量、控制仪(简称测控仪)。特点是电路简单,无需进行温度测试及标定,制作方便。该测控仪测量、控制温度为2～100℃ ,精度可达±3℃以内。温度传感器LM35D简介 LM35D是一种输出与摄氏温度成比例的温度传感器,其灵敏度为10mv/℃;工作温度范围0～100℃(在100℃时输出为1.0V);工作电压范围宽:4～30V;精度±1℃;线性度好(最大非线性误差为±0.5C);静态电流小(典型值为80μA);输出阻抗低;在1mA负载时为0.1Ω。另外,它最大的特点是无外围元件,也无需校正。该器件为TO-92封装,其外形、管脚功能及典型应用电路如图1所示。
This article describes a temperature measurement for industrial and agricultural automatic control, controller (referred to as the monitor). Is characterized by simple circuit, without temperature testing and calibration, easy to manufacture. The measurement and control instrument measurement, control the temperature of 2 ~ 100 ℃, accuracy up to ± 3 ℃ less. Temperature Sensor LM35D Introduction The LM35D is a temperature sensor with output proportional to Celsius, with a sensitivity of 10mV / ℃; operating temperature range of 0 ~ 100 ℃ (output of 1.0V at 100 ℃); working voltage range of 4 ~ 30V; Accuracy ± 1 ° C; Good linearity (± 0.5C maximum non-linearity error); Small quiescent current (80μA typical); Low output impedance; 0.1Ω at 1mA load. In addition, its biggest feature is no external components, but also without correction. The device is TO-92 package, its shape, pin function and typical application circuit shown in Figure 1.