A demister is a device used to remove fog or mist in various applications, such as diving goggles, car windows, and steam treatment units. Different types of demisters are available from various manufacturers, including chemical compounds, heating elements, and filters made of knitted wire mesh. It is important to maintain and replace the demister to ensure its effectiveness.
The term “demister” can be used to refer to different types of devices used to remove fog or mist. The device under discussion is usually clear from the context of the conversation, as they are used in very different applications, from cars to scuba diving equipment. These devices are available from several manufacturers, some of which also develop custom products for special uses.
In the diving sense, a demister is designed to remove fog from inside the diving goggles. There are a number of tactics used by divers, snorkelers, and other goggle wearers to remove fog and prevent its buildup. In this case, the demister is actually a chemical compound that is swallowed through the goggles to remove the buildup and prevent future fog buildups. Defogging solutions are available at stores that sell dive supplies, as well as through dive catalogs.
Many cars have a feature known as defogger which is used to manage condensation on the window glass. As condensation can impair visibility, drivers want to be able to remove it as quickly as possible. The demister heats the glass, helping the dissipation of the condensation and clearing the window. These devices are generally not designed to melt frost, with frost requiring a scraper to successfully remove the window unless the frost is very light.
In the sense of industrial production, a demister is a filter that is placed in steam treatment units. As the vapor passes through the demister, the droplets adhere to the filter, pulling large droplets out of the vapor. Droplets can be filtered down, allowing vapor to rise and exit the device from the top, while fluid collects below. Once passed through a steam separator, the respective steam and water can be used in various ways.
Classically, the demister used in a steam treatment unit is a demister pad made of knitted wire mesh. The device is usually designed to be cleanable and replaceable so that it can be maintained as it wears out with use. One problem with mesh pads is that the demister tends to trap particulate matter, as droplets often form around the particulate matter and as a result, it can become dirty over time. Therefore, it is important that it is serviceable by technicians and users so that the steam treatment unit is kept in good working condition.
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