Instrument Used To Measure Relative Humidity

Select an analog hygrometer for an inexpensive option.

Instrument used to measure relative humidity.

A simple form of a hygrometer is specifically known as a psychrometer and consists of two thermometers one of which includes a dry bulb and the other of which includes a bulb that is kept wet to measure wet bulb temperature. A sling psychrometer measures relative humidity using the cooling effect of evaporation. A hygrometer is a weather instrument used to measure the amount of humidity in the atmosphere. Just about everyone knows that it refers to the amount of moisture in the air but you re a lot less likely to find someone who understands the different humidity measurement units.

There are two main types of hygrometers a dry and wet bulb psychrometer and a mechanical hygrometer. Environments with 10 rh are defined here as low humidity environments. Instead measuring dew point will provide a good indication of humidity. Hygrometers are instruments used for measuring humidity.

Two thermometers are used in a sling psychrometer. Water evaporates from the cloth causing the temperatures on that thermometer to be lower than the other. As the material expands or contracts based on the moisture in the air the coil spring moves a needle on a circular dial that gives you a measurement of the relative humidity. Digital thermometers provide precise temperature readings for a wide range of applications including indoor and outdoor settings heating and cooling systems and chemical processing.

Wet the cloth of one of the thermometers and swing the psychrometer around a few times. Humidity can be a complex topic to understand. For example vaisala drycap products are designed for measuring dew point. Temperature and humidity measuring devices track temperature changes humidity levels and other climatic conditions in commercial and industrial environments.

At low humidities the calibration accuracy of instruments measuring relative humidity may not be adequate. Humidity is the measure of the amount of moisture in the air. A hygrometer is an instrument used to measure the amount of water vapor in air in soil or in confined spaces. One measures the dry bulb temperature and the other measures the wet bulb temperature.

A psychrometer is an example of a hygrometer. A hygrometer is an instrument used to measure relative humidity. Humidity measurement instruments usually rely on measurements of some other quantities such as temperature pressure mass a mechanical or electrical change in a substance as moisture is absorbed. Analog hygrometers are cheaper than digital hygrometers and are often much more durable.

In this article we ll go over the five different units that you need to learn and we ll explain why relative humidity is the most useful.