第10章半导体传感器案例.ppt

* Whereever hygroscopic products (like paper, textiles, granulates or else) are produced, it is extremely important to control relative humidity of the surrounding air. This is because too dry air can cause static charge of the material, in extreme conditions the material can also be torn to pieces. And too wet air leads to wrong adjustment of the machines, thus wrong product quality. And moreover wet material, thus material of higher weight, consumes more energy to be processed. We have a number of good references for this kind of applications. For example painting lines. Today, more and more painting lines in the industries work on the base of water as a solvant. With this technology, it is highly important to control relative humidity within the painting room. Our most outstanding reference here is Daimler-Chrysler, where we have supplied Hygrotest for two different applications, to the customer‘s satisfaction. * Wood drying is performed within huge halls with emmense stacks of wood. A high quantity of water is taken out of the wood: E.g 1000 kg of oak wood has to loose 500 liters of water in the course of the drying process. Relative humidity, temperature and duration vary depending on the wood involved and the specific process. Within a thermally insulated cell, the stacks of wood are exposed to an air stream, which is forced by fans (see outlets on photo!). An air cooler takes away condensate, and an air stream bypass helps to control the process. If drying is proceeded too quickly, the wood can loose its surface quality or bend and thus be of less value. This is why the process is to be undergone under precise relative humidity control. Because of the high humidity involved, a heated probe (Hygrotest 650 HP) is usually the best solution. * Ceramics and brick production are demanding drying processes. The bricks are put onto wagons and are sequentially treated in two dryers. The probes are usually inserted from the top and thus a cable/probe version