Dew point sensors

Dew point sensors can be summarily described as devices whose electrical properties change in relation to water vapour pressure. Properties include capacitance, resistance and impedance, and these types form the majority of the water vapour sensors used in industry as they have moderate cost levels (approximately $1500 per sensor) and have developed over many years to suit industrial applications with industrialised mechanical features and signal output. An example of a typical aluminium oxide dew point sensor construction is shown in the associated PowerPoint file露点传感器（dew point sensor）可被概括为一类电学特性随水蒸气压变化而改变的装置。其核心电学特性涵盖电容（capacitance）、电阻（resistance）与阻抗（impedance），此类传感器占据了工业用水蒸气传感器的主流份额。得益于单台售价约1500美元的适中成本，且经过多年技术迭代，该类传感器已适配具备工业化机械结构与信号输出的各类工业应用场景。典型氧化铝（aluminium oxide）基露点传感器的结构示例详见配套PowerPoint文件。