The whirling hygrometer or sling psychrometer consists of two thermometers mounted on the a frame that can be whirled in the air by hand. This document comes with our free notification service, good for the life of the document. It consists of two thermometers mounted in a case with a revolving handle. In this case the wet and drybulb thermometers are attached to a frame with a handle. Whirling meaning in the cambridge english dictionary. A psychrometer is the simplest kind of hygrometer a device for measuring humidity.
The use for this instrument is to ascertain the air humidity at any time. The whirling hygrometer also known as a sling psychrometer is made out of two thermometers mounted on a frame which rotates around a handle, so it can be whirled in the air by hand. You can also choose from temperature sensor, hygrometer, and glass thermometer whirling hygrometer there are 22 suppliers who sells whirling hygrometer on, mainly located in asia. This procedure outlines the proper procedure and frequency for evaluating and calibrating thermometers and hygrometers used in the animal facilities.
To ensure wick a is saturated with water and covers spirit reservoir on wet bulb thermometer d, remove end cap b and immerse psychrometer body c up to the thermometer reservoirs until wick is thoroughly wetted. Whirling hygrometer also known as sling psychrometer wet. It has numerous commercial uses, but the primary purpose of the device is to measure the amount of water vapor humidity in the air. A simple form of a hygrometer is specifically known as a psychrometer. Dec 02, 2018 to fully understand how to use a hygrometer, it helps to know when and where you can use it. Psychrometer, a hygrometer composed of two similar thermometers. Dec 19, 2016 here is a whirling hygrometer they are also sometimes called psychrometers. The whirling hygrometer comes in several forms and choices meaning that there is certainly one that suits every taste and budget.
Measuring relative humidity with a whirling hygrometer the. Whirling and sling hygrometer, psychrometer caltech. Standards new zealand specification for whirling hygrometer. The whirling hygrometer, also referred to as the sling psychrometer, is another form of the hygrometer.
Corrosion correctors llc poulsbo, wa tom swan cci inspection services inc. Bacharach 00127012 red spirit filled sling psychrometer. When the hygrometer is swung in the air, the evaporation. Be careful to use the sling psychrometer correctly as it does have some drawbacks. To use, simply whirl it rapidly over a given period of time in conjunction with the slide rule to establish computations. Bs2842 specification for whirling hygrometer document. The whirling hygrometer offers the maximum level of accuracy due to the nature of measurement. How to measure wet bulb and dry bulb temperature with hygrometer duration. Requirements for thermometers suitable for use in whirling sling hygrometers and requirements for the frame. This hygrometer has spirit filled thermometers and is available in c or f scales. Eliminates the hazard of splattering mercury by using a safe and easy to read red liquid. A copy of this instruction manual is available for download on our website via. This field is intended to catch out spammers please leave it blank.
Hygrometer meaning in the cambridge english dictionary. Whirling hygrometer whirling thermometer latest price. The bulb of one thermometer is covered with a tightfitting muslin sack and wetted with water. Browse our dictionary apps today and ensure you are never again lost for words. Specification for whirling hygrometer this document has been reassessed by the committee, and judged to still be up to date. In mining, a hygrometer used to obtain wetbulb temperatures. Housed in a robust yellow plastic frame and black folding handle, the instrument incorporates a water cistern linked to the wet bulb by means of a cotton sleeve. A whirling hygrometer is an instrument used for measuring the moisture content in the atmosphere. Hygrometer a hygrometer humidity meter is used to measure the amount of water vapour in the air and is expressed as rh relative humidity %. G116a1 elcometer 116a whirling hygrometer metric c.
There are many physical effects dependent on the amount of water vapor in the air, which have been used to construct hygrometers. The hygrometer is spun round and round at a speed of about 200 rpm, for at least 1 min, and then read as quickly as possible. The unit measures 9 x 534 x 1 and weighs 200 grams. To fully understand how to use a hygrometer, it helps to know when and where you can use it. When measuring the temperatures, the frame is whirled around like a football rattle. This document has been reassessed by the committee, and judged to still be up to date. Whirling hygrometer whirling hygrometers, also known as sling psychrometers, employ the wet and dry bulb principal to determine %rh. How to use whirling hygrometer as per astm e337 youtube. Sometimes summer temperatures in the mid or upper eighties in a city, like washington d. A simple relative humidity guide is provided but more accurate results can be obtained using the elcometer 114 dewpoint calculator. A hygrometer is an essential instrument in meteorological science. This article looks at the use of whirling hygrometers to measure and assess heat and humidity in the mining environment. One thermometer is covered with a tightfitting muslin sock which is kept wet by preferably with distilled water. Humidity measurement instruments usually rely on measurements of some other quantity such as temperature, pressure, mass, mechanical, or electrical change in a substance as moisture absorbed.
Bacharach sling psychrometer 00127043 celsius scale, bacharach sling psychrometer 0127012 fahrenheit scale. This tool is one of the most economic methods of monitoring relative humidity and dew point. One of the most economic methods of monitoring relative humidity that utilises the wet and dry principle, thermometers manufactured to bs2842 allows accurate readings to be taken. This hygrometer has a cotton wick covering the top thermometer, and water is wicked. Calculating relative humidity using sling psychrometer christopher rafalik.
A whirling psychrometer uses the same principle, but the two thermometers are fitted into a device that resembles a ratchet or football rattle. Whirling hygrometers are used to measure relative humidity and temperature directly, they have two matched thermometers called bulbs one is the dry bulb and the other the wet bulb. Whm whirling hygrometer the whm can be used to calculate the prevailing dew point temperature quickly, easily, and economically in combination with a dew point calculation table. A hygrometer is an instrument used to measure the amount of humidity and water vapour in the atmosphere, in soil, or in confined spaces. Number of degrees difference between the wet and drybulb readings. Methods of measuring humidity and testing hygrometers dtic. The elcometer 116a whirling hygrometer is designed to measure the ambient relative humidity from which the dewpoint temperature can be calculated. The compact whirling hygrometers available from slingsby are designed to be rotated by hand to provide adequate and consistent ventilation of the bulbs.
Humidity measurement instruments usually rely on measurements of some other quantity such as temperature, pressure, mass, a mechanical or electrical change in a substance as moisture is absorbed. This hygrometer has a cotton wick covering the top thermometer, and water is wicked from a water reservoir on the right. High moisture levels in the immediate vicinity of a metal can contribute to higher corrosion rates due to the formation of aqueous ions. Whirling hygrometer also known as sling psychrometer wet and dry bulb. These manual hygrometers determine the dewpoint and relative humidity. Accuracy and linearity of sling and digital psychrometers phillip k. Nov 23, 2016 a sling psychrometer is used to determine the atmospheric humidity of an environment that surrounds a given metal application. Refer to the instruction manual of the aspirator to repair the aspirator motor. The whirling hygrometer is one of the most economic methods of monitoring relative humidity and dew point. Housed in a yellow plastic case with folding handle. Measuring relative humidity with a whirling hygrometer the paper.
A guide for relative humidity rh determination is supplied with each instrument and the dewpoint. Hygrometers free delivery possible on eligible purchases. Home casella cel personal comfort monitors whirling hygrometers. The mine environment exposes workers to a wide range of obvious dangers. How does your comfort level differ on a warm day in summer from a similarly warm day in autumn. Here is a whirling hygrometer they are also sometimes called psychrometers. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. Ambient conditions can be critical to the success or failure of a coatings project. It is the responsibility of the facility manager to ensure that equipment is appropriately. These hygrometers are filled with a blue spirit filling and have a fixed handle designed to be rotated, by hand, to provide adequate and consistent ventilation of the bulbs. A psychrometer fitted with a fan is called an aspirated psychrometer or assmann hygrometer.
Red liquid whirling hygrometer 5050c obtain fast and accurate humidity readings anywhere by comparing the reading of the wet and dry bulb thermometers on the enclosed humidity chart. Whirling hygrometer is a device for measuring the relative humidity of air. How to use whirling hygrometer as per astm e337 duration. The bulb of one thermometer is kept wet by means of a thin, wet cloth wick so that the cooling that results from evaporation makes it register a lower temperature than. The hair hygrograph was inaccurate, but the graph was corrected from whirling hygrometer readings five times a day. Find out information about storrow whirling hygrometer. How to measure wet bulb and dry bulb temperature with hygrometer.
Provides accurate values of dewpoint and relative humidity from the wet and dry bulb temperatures. Thank you for your purchase of the elcometer 116a whirling hygrometer. Whirling hygrometer relative humidity monitor preservation. The manual hygrometer consists of two thermometers, one of which has the bulb. Bs 5248 specification for aspirated hygrometer published by bsi on may 31, 1990 celsius scale solidstem, mercuryinglass thermometers for electrically or clockwork driven aspirated hygrometers more accurate than the whirling hygrometers described in bs 2842. A psychrometer measures humidity by taking both a wetbulb and a drybulb temperature reading. This thermometer is known as the wetbulb thermometer. When necessary, the mirror should be cleaned with deionized or distilled water applied with a lintfree swab. Whirling hygrometer the established and well known method for determining the temperature and moisture content in the air prior to painting. Hygrometer humidity meter thermohygrometers brannan. The elcometer 116a whirling hygrometer is scaled in degrees celsius. Experiment1 hygrometer title study of whirling hygrometer.
The dewpoint can be accurately obtained using elcometer 114 dewpoint calculator. Relative humidity, the amount of moisture in the air relative to the amount of moisture the air can hold, is an important measurement for understanding the weather. Another variant is the sling or whirling hygrometer. A hygrometer is an instrument used to measure the amount of humidity and water vapour in the. We stock many types of hygrometer which can be found below and a description of the way each type works at the bottom of this page. A whirling psychrometer uses the same principle, but the two thermometers are fitted. Measuring relative humidity with a whirling hygrometer.
The instrument consists of wet and dry bulb thermometers mounted side by side in a frame with spindle and handle attached. The whirling hygrometer or psychrometer is a established and wellknown method for determining the relative humidity and if there is any moisture on steel prior to painting. The elcometer 116a whirling hygrometer is available in celsius scale. Astm e 337b and bs 2842 the whirling hygrometer employs the wet and dry bulb principle to determine the relative humidity of the atmosphere.
A hygrometer in which the two thermometers are mounted side by side on a brass frame and fitted with a loose handle so that it can be whirled in the. Zeal whirling hygrometer sling psychrometer the zeal whirling hygrometer sling psychrometer offers the maximum level of accuracy for the measurement of relative humidity utilising wet and dry bulb red spirit filled thermometers. One of the most economic methods of monitoring relative humidity that utilises the wet and dry principle, thermometers manufactured to bs2842 allows accurate readings to. This document is available in either paper or pdf format.
The elc ometer 116a whirling hygrometer is scaled in degrees celsius. Dew point is the temperature at which a sample of moist air or any other water vapor at constant pressure reaches water vapor saturation. The dry bulb is simply left exposed to the air to measure the temperature. Bs2842 specification for whirling hygrometer graduations, accuracy, marking, humidity measurement, glass, dimensions, working range, temperature measurement. Sep 23, 2017 my memory is that there are two thermometers, one that measures ambient temperature dry bulb, and one with the sensor surrounded by a damp absorbent material wet bulb. Thank you for your purchase of the elcometer 116a whirling hygrometer psychrometer. Bs2842 specification for whirling hygrometer graduations, accuracy, marking, humidity measurement, glass, dimensions. The unit incorporates a water reservoir linked to the wet bulb by the means of a cotton sleeve. A wide variety of whirling hygrometer options are available to you, such as household, industrial, and outdoor. How to find the relative humidity by a whirling hygrometer. Find here whirling hygrometer, whirling thermometer manufacturers. Add the power of cambridge dictionary to your website using our free search box widgets. The wet bulb is covered with a cloth wick and dipped in water until it is ready to use. Calculating relative humidity using sling psychrometer youtube.
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