Wet Dry Bulb Psychrometer

A sling psychrometer has two thermometers.

Wet dry bulb psychrometer.

A sling psychrometer is an instrument that measures the relative humidity and dew point in an area. The rh is found from a table. It includes a dry bulb thermometer a wet bulb thermometer and a psychrometric chart a graph that plots the relationships between the dry and wet bulb temperature relative humidity and dew point at constant pressure. When the psychrometer is swung around by its attached chain or handle the air causes the water on the wick to evaporate which.

Due to the small 2 inch length probe we classify this one as the entry level model for duct inspection works. This is called a wet dry bulb psychrometer. Fieldpiece prh2 is a pocket type digital psychrometer that comes with a friendly price point. A widely used device for measuring wet and dry bulb temperature is a sling psychrometer which consists of a pair of mercury bulb thermometers one with a wet sock to measure.

Relative humidity is measured using a device called a sling psychrometer this consists of 2 side by side conventional thermometers one of which the wet bulb thermometer has a wetted wick placed at the bottom the other the dry bulb thermometer has no wetted wick. The dry bulb thermometer shows the temperature of the air and the wet bulb thermometer whose bulb is wrapped with wet cambric shows a temperature that is dependent on the amount of evaporation from the surface of its bulb. Evaporation from the wick surrounding the wet bulb cools the thermometer. The dry bulb is simply a thermometer.

The psychrometer consists of a dry bulb thermometer and a wet bulb thermometer. Eray temperature and humidity gauge meter with backlight digital psychrometer thermometer hygrometer dew point and wet bulb temperature battery included 4 4 out of 5 stars 221 26 99 26. The relative humidity rh is measured by reading the two thermometers. When readings are taken simultaneously it is possible with the use of psychrometric tables to determine the relative humidity and dew.

This tool is very easy to use slim and provides instant reading through the screen over the wet bulb rh dew point and dry bulb temperatures. At temperatures above the freezing point of water evaporation of water from the wick lowers the temperature such that the wet bulb thermometer will be at a lower. The lower the rh in the air the more is the evaporation from the wick and the lower the temperature of the wet bulb. A psychrometer or a wet and dry bulb thermometer consists of two calibrated thermometers one that is dry and one that is kept moist with distilled water on a sock or wick.

A wet bulb and a dry bulb. By definition wet bulb temperature is the lowest temperature a portion of air can acquire by evaporative cooling only. The wet bulb has a cotton wick over the bulb of the thermometer which is moistened with room temperature water.