An Introduction to Humidity Sensors

In scientific and industrial environments humidity sensors are highly appreciated devices as part of their control or monitoring systems as they allow factory operators and scientists make sure that they are operating with chemical compounds or other kind of elements in an environment that complies with the adequate levels of humidity.

There are a wide number of applications where humidity sensors become useful. Humidity can have a serious impact on chemical and industrial processes, ruining hours and hours on end of production and scientific efforts and this is why these instruments are so valuable.

Humidity is the content of water vapor in air and we are quite used to learning about it every morning as we listen to the weather forecast before going to work. Just as an excess of humidity makes it difficult to keep our hair straight and we suffer from frizz (curly haired men and women know what I am talking about), in laboratories and industrial environments such as pet and human food industries, leather industries, coffee bean grinding industries and beer manufacturing an excess of humidity can be really serious. And just as we cannot tell exactly how wet it is outside just by popping our heads out of the window, factory operators and scientists need to rely on humidity sensors or hygrometers to know if the place where they are manufacturing medicines, beer, potato chips, grind coffee, pet food, breakfast cereals and so on is dry enough. Hygrometers are extremely sensitive devices that can tell quite accurately if there is a need to do some kind of adjustment to the humidity levels.

Industries and laboratories usually have more than one humidity sensor installed in their premises as each step of the manufacturing process may require precise levels of moisture. At certain stages of the manufacturing procedure a sample is taken and weighed. Then it is introduced in the moisture sensor where it is dried up. This can take several minutes or a couple of hours depending on the size of the sample and what has to be measured. Once dried, the sample is weighed again. An operator compares the two weights in order to know the water content in the initial sample. If the result obtained is within acceptable levels, the process continues but, if any kind of correction or adjustment has to be made, he does it immediately so that the manufacturing process is not altered.

Eduard Jim Writing for Moisture Sensors

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