{"id":34051,"date":"2019-07-30T09:30:04","date_gmt":"2019-07-30T07:30:04","guid":{"rendered":"https:\/\/www.tfa-dostmann.de\/world-of-tfa\/humidity\/messen-mit-hygrometer\/"},"modified":"2025-03-06T11:00:33","modified_gmt":"2025-03-06T10:00:33","slug":"measure-humidity","status":"publish","type":"page","link":"https:\/\/www.tfa-dostmann.de\/en\/humidity\/measure-humidity\/","title":{"rendered":"Ways to Measure Humidity"},"content":{"rendered":"
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How do I measure humidity?<\/h2>\n

A hygrometer solves this problem for us. This device is based on the property that certain materials have, which is to react to changes in air humidity. In analogue humidity meters, this manifests itself in the form of expansion or contraction. Digital hygrometers integrate components in which conductivity depends on the humidity of the ambient air.<\/p>\n\n\"Wohnraum\n

What is a hygrometer?<\/h3>\n

A hygrometer is a device used to determine the relative humidity. Conclusions can be drawn about the quality of the ambient air with the help of the values obtained. Is the air overly dry or too humid? Is there a risk of mould\/ mildew in the living spaces? Does my room have the ideal humidity level? Is the humidity level ideal for storing books or musical instruments?
\nWe can answer all these questions based on the hygrometer readings and immediately recognise whether the humidity level is ideal or not.<\/p>\n

What types of hygrometer are available?<\/h4>\n

Today, we have several options to choose from, when it comes to measuring the humidity in the ambient air. Depending on the purpose and preference, you can opt for an analogue or a digital hygrometer.<\/p>\n

When combined with a weather station<\/a> or a WeatherHub<\/a> Smart Home set, digital hygrometers can benefit from wireless technology which is also used to transmit the measured values from the transmitter to a base station or an app. This way, you can read the hygrometer\u2019s values in a very convenient way and with additional functions such as max-min readings and to set alarm for values.<\/p>\n

Analogue hygrometers are also called absorption hygrometers. The measurement is carried out with the help of water-attracting (hygroscopic) materials. The classic amongst analogue humidity meters is the hair-tension hygrometer, which utilises human hair as gauge. In modern hair-tension hygrometers, a synthetic hair is used instead.<\/p>\n

Who invented the hair hygrometer?<\/h5>\n

The hygrometer was invented by the Swiss physicist Horace-B\u00e9n\u00e9dict de Saussure in the 18th century. He took advantage of the properties of the human hair: when the humidity increases, the hair expands and contracts again as the air becomes drier. Blond hair in particular was considered ideal because it is very thin. At the heart of the TFA-patented and particularly precise synthetic-hair hygrometer lies a synthetic hair. In bimetallic hygrometers, the hair is replaced with a coated bimetallic spring.<\/p>\n<\/div>\n

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How is an analogue hygrometer calibrated?<\/h3>\n

TTFA hygrometers are calibrated at the factory. Transport, storage or even permanent use in a dry environment affects the hygroscopic functioning of the bimetallic spring or the synthetic hair.
\nIn order to keep your hygrometer in top shape, we recommend that you regenerate the measuring device at least every six months, calibrate and adjust it if necessary.<\/p>\n

Hygrometer regeneration<\/h4>\n

Regeneration is primarily about restoring the ideal texture of delicate materials. Hair, for example, can become brittle if constantly exposed to dry air. By exposing the hair to a high-moisture content environment, you restore its natural state, hygroscopic properties and accuracy.<\/p>\n

Please proceed as follows:<\/p>\n