用传感器跟踪工业过程

　　用传感器跟踪工业过程

　　工业过程的成功在很大程度上是建立在稳定、可重复的条件下进行的。这有助于减少过程中的可变性，提高创建一致输出的机会，并且使故障排除问题更加容易。

　　传感器可用于建立测量、反馈和控制系统，以稳定工业过程的操作条件。但是你衡量什么呢？我们将研究一些与工业过程控制相关的基本传感器类型，它们测量温度、压力、湿度、液位、气体浓度和质量流量等因素。了解什么是传感器，它们是如何工作的，以及它们的功能和局限性，有助于设计者创建监控系统，提供必要的精确信息，以确保工业过程的稳定性和可重复性。

　　Temperature

　　Tracking temperature is one of the most basic elements of process control. Although we are used to thermistors and temperature probes， other approaches are emerging to make it easier to gather multiple temperature readings from large installations.

　　Take Maxim’s DS18S20， a ‘1-wire’ digital thermometer， which only needs a single data line to communicate with a host controller. The part is available in a three-leaded TO-92 package， on which two of the leads are dedicated to power and ground and the third is the data output， and in an 8-pin Small Outline package with five unconnected leads. The thermometer can even draw its power from the data line， removing the need for a separate supply and simplifying installation.