What Is A Hygrometer, The Way It Works, & Its Different Types?

What Is A Hygrometer?

A hygrometer is an important tool for most manufacturing industries as it helps to measure the amount of moisture in the air. It is used in a variety of industries and processes where accurate humidity measurements are critical. It is an important invention for many industries as too much or too little moisture can impact the quality of the products being manufactured. For example, in the electronics industry, a hygrometer is used to ensure that the products being assembled are not damaged by moisture. Some of the industries and processes that use hygrometers include humidity control in food processing and storage as well as indoor air quality monitoring and also pharmaceutical industry. It is extremely required especially in food processing and storage industries in order to prevent the growth of mold and mildew, and to protect sensitive materials from damage due to presence of moisture in the air.

How A Hygrometer Works & Its Types?

There are many different types of hygrometers, but they all work by measuring the amount of water vapor in the air. Let us discuss the most common types of hygrometers as below. 

  • Psychrometer: The most common type of hygrometer is a psychrometer, which consists of two thermometers, one of which is dry and the other of which is wet. The dry thermometer measures the air temperature, while the wet thermometer measures the temperature of the wet bulb. As such, a hygrometer works on the principle phenomenon called evaporative cooling. During the process of evaporation, the surface from which water has evaporated becomes colder since the water molecules absorb the surface heat to change their physical state in the form of vapors. Because of this, the wet bulb thermometer will consistently record lower temperature values than the dry bulb thermometer. In simple terms, you may feel instant cooling while you are in a shower. When you have low humidity levels along with mostly dry air present, it can lead to higher and faster evaporation rate and you will notice a significant decrease in wet bulb temperature. When there is very high humidity in the air, the decrease in wet bulb temperature is very less. When the humidity level is 100%, both dry and wet bulbs will register the same temperature.
  • Electrical Hygrometer: This type of hygrometer uses a fine-layer semiconductor device, and the hygrometer analyzes its variance in electrical resistance to accurately measure the humidity levels. Contrary to this, most hygrometers detect humidity levels based on variations recorded in weight, transparency, and volume of substances to determine the moisture content. Electrical hygrometers are of two types, namely resistive type and capacitive type hygrometers based on changes in resistance or capacitance. Each type has a sensor to detect even the minor variations in the semiconductors’ on-chip layer. 

Heatcon – The Leading Manufacturer & Supplier of High-Quality & Most Accurate Hygrometers in India?

If you’re looking to procure a hygrometer for your industrial process or have a specific requirement for which you are looking for a custom-solution, you can contact the experts at Heatcon who have decades of experience in manufacturing the best type of high-quality and accurate hygrometers.