A sling psychrometer holds a wet-bulb thermometer and a dry-bulb thermometer. … A sling psychrometer can be
used to determine the physical and thermal properties of moist air by using standard tables and charts
. Typically it is used to determine relative humidity.
What is a sling psychrometer used for?
One of the oldest used instrument
for determining relative humidity
is the whirling hygrometer (or sling psychrometer). Whirling hygrometer consists of two thermometers that are turned by vigorously swinging the handle and exposing the thermometers to rapid air movement.
How does a psychrometer work?
A psychrometer
measures the relative humidity in the atmosphere through the use of two thermometers
: a dry bulb thermometer, is used to measure the temperature by being exposed to the air. a wet bulb thermometer, measures temperature by having the bulb dipped in a liquid.
Why is a sling psychrometer called a sling psychrometer?
� The wet bulb is wrapped in an absorbent material such as muslin, which is immersed in water and serves as a wick. � When the web bulb is taken out of the water, it cools by evaporation of the water. �
If the bulb is whirled around to hasten evaporation
, it is called a sling psychrometer.
What is the major by sling psychrometer?
A sling psychrometer is a hygrometer that can be rotated in the air to make a wet-bulb attain a constant value. It is used
to determine the atmospheric humidity in a given area
.
How accurate is a sling psychrometer?
The sling psychrometer is a hand-operated device, while the aspirating psychrometer is usually battery powered, although wind-up models exist. These instruments are
accurate to *2% RH
when properly maintained and operated by trained and practiced users.
Why does a psychrometer work?
A psychrometer is a
device used to measure the humidity of air
. It accomplishes this by comparing the difference in temperature between a dry thermometer bulb and a wet thermometer bulb that has lost some of its moisture through evaporation.
How do you use a sling psychrometer accurately?
Method. Before use,
soak the wet bulb wick of your psychrometer in water
. Once the wick is wet, hold the handle and whirl the psychrometer in the air. Whirling generates airflow around both the wet and dry bulbs.
Which of the following is main advantage of sling psychrometer?
Sling Psychrometer ( wet and dry bulb temperature):
This
used to rotate by the help of hand rotor to increases the velocity of air
. Wet bulb thermometer consist of a sock, by this it can dip into the water without wetting the dry bulb thermometer.
How long do you swing a sling psychrometer?
6. Dip the cloth-covered thermometer bulb in water to ensure it is wet. 7. Being mindful of other people, carefully swing the sling psychrometer in a circle for
at least two minutes
.
Which out of the following is the main advantage of sling psychrometer?
Solution(By Examveda Team)
A hygrometer measures
relative humidity
. Sling pychrometer is a simple hygrometer consisting two thermometers : An ordinary thermometer & a wet bulb thermometer with its bulb covered by cloth wick; used to find relative humidity.
Can be measure by a sling psychrometer?
A sling psychrometer is an instrument that
measures the relative humidity and dew point in an area
. A sling psychrometer has two thermometers: a wet bulb and a dry bulb. The wet bulb has a cotton wick over the bulb of the thermometer, which is moistened with room temperature water. The dry bulb is simply a thermometer.
How is relative humidity calculated?
Divide actual vapor pressure by saturation vapor pressure and multiply by 100 to obtain a percentage using the formula Relative Humidity
(percentage) = actual vapor pressure/saturated vapor pressure x100
. The resulting number indicates relative humidity.
What should be the rotation of the sling psychrometer?
Operation of Sling Psychrometer
In order to measure the dry bulb and wet bulb temperature, the Psychrometer frame – glass covering – thermometer arrangement is rotated at
5 m/s to 10 m/s
to get the necessary air motion.
