什么是RTD？

Platinum Resistance Temperature Detectors (Pt-RTDs)是温度传感器在体温下发生相应变化时具有正，可预测且几乎线性变化的温度传感器。

将薄铂膜沉积在高纯度氧化铝底物上会产生薄膜铂耐药温度检测器元件。然后将图案蚀刻到RTD元件上，然后产生电路。随后将电路修剪为所需的电阻值。然后连接铅线，并施加涂层以保护铂膜和铅线连接。

The main feature of a Pt-RTD element is a nearly linear relationship between its body temperature and its resistance value. It’s the key characteristic needed to precisely measure temperature over a very wide range of operating temperatures. Platinum RTDs will maintain a significant and uniform rate of range of resistance vs. temperature over an extended operating temperature range and that is ideal for digital measurement and control applications.

为了测量温度，RTD传感器必须连接到监视或控制设备。在使用时，很小的电流通过传感器。然后，它的电压受RTD的电阻调节，然后将RTD的电压下降转换为温度。最小化流经电阻温度检测器的电流将防止自热。在两线RTD中，还应注意补偿延长铅线电阻。

Acquired by Littelfuse in 2017, U.S. Sensor Corp.® provides thin film Pt-RTD elements and thin film PT-RTD assemblies in resistance values such as 100Ω, 500Ω and 1000Ω at 0°C with TCRs (temperature coefficient of resistance) of 3750 and 3850 PPM/°C. Resistance tolerances include 0.06%, 0.12%, 0.24%, and 0.48%.

Littelfuse thin film platinum RTD sensor assemblies are capable of operation from below -50°C to well above +500°C and they are available in a variety of thermowell sizes and materials as well as lead wire options. Please contact Littelfuse application engineering personnel atsales.ussensor@littelfuse.com协助设计RTD传感器组件，以供您唯一的应用。