Sketch Wet And Dry Bulb Hygrometer

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.

Sketch wet and dry bulb hygrometer.

Such an instrument is called a wet bulb thermometer. Wet dry bulb hygrometer wall mounted thermometers eisco labs. A hygrometer is an instrument used to measure the amount of humidity and water vapour in the atmosphere in soil or in confined spaces. Meteorological instrument center japan meteorological agency 1 1 sorption method changes of the dimensions changes of electrical properties 1 2 psychrometric method difference between the dry bulb and wet bulb temperatures related to the ambient humidity.

When we use alcohol in wet bulb temperature drops very rapidly and gives more difference between dry and wet bulbs because water evaporates more rapidly from the wet bulb s surface than water giving more cooling effect. A hygrometer is a device that is used to measure the moisture content of the air basically this means the relative humidity and the dew point. Wet and dry bulb psychrometers are the most simple and common way of measuring humidity. Wet bulb temperature is measured using a thermometer that has its bulb wrapped in cloth called a sock that is kept wet with distilled water via wicking action.

When the thermometers are ventilated the wet bulb temperature will be lower than the dry bulb temperature. Always water is used in hygrometers. Subtracting the wet bulb reading from the dry bulb reading yeilds the wet bulb depression. Reading the hygrometer is not tricky but it may vary depending on the type and model you are using.

For instance a wet and dry bulb requires the following numbers. Relative humidity is determined by the difference of the temperatures of dry bulb thermometer and wet bulb thermometer. This type of hygrometer uses two basic mercury thermometers one with a wet bulb one with a dry bulb. The oldest and the most common is to use a dry bulb and a wet bulb thermometer this is what is known as a psychrometer.

Wet bulb depression the difference between the first and second temperatures. The difference between the wet and dry bulb temperature enables the rh to be determined through the use of the table and calculate. Get it thu sep 24 tue sep 29. Only 9 left in stock order soon.

Housed in a yellow plastic case with lid and bulb protection these red spirit hygrometers are available in two ranges. Masons hygrometer wet dry bulb c f simple form of psychrometer to provide easy way to measure the amount of water vapour in the atmosphere on a percentage scale known as relative humidity rh. The temperature of the wet bulb. There are several different ways that this can be done.