Sling psychrometer4/26/2023 After another 20 to 40 seconds, once again read the thermometers. Once the wick is fully saturated with distilled water, you then whirl (or spin around) the hygrometer above your head for between 20 to 40 seconds at approximately 180 revolutions per minute, or 3 revolutions per second, or faster.Īfter the 20 to 40 second whirl, the thermometers are quickly read, noted, and then the hygrometer is spun again. Regardless of which hygrometer you are using, it’s important you ensure before testing that the wick is not only fully saturated with water, but also clean, tight fitting, and fully covers the thermometer bulb. In the case of the Elcometer 116C Sling Hygrometer, you are additionally instructed to fully submerge the thermometer bulbs in distilled water first to ensure the wick is saturated, and then fill up the reservoir to keep the wick saturated as you test. To prepare the wet bulb thermometer, distilled water is added to the reservoir of the hygrometer, and this saturates the wick. While the dry bulb thermometer is measuring what is thought of as ambient air temperature, the wet bulb thermometer is used to calculate relative humidity. One thermometer is covered with a fabric “sock” or “wick” connected to a reservoir (this measures your wet bulb temperature), while the other is uncovered (this measures your dry bulb temperature). Hygrometers consist of two liquid filled thermometers positioned side-by-side in a rotating body. and the Dewpoint (Td), the temperature at which moisture condenses on a surface, calculated from the air temperature and % Relative Humidity.Įlcometer provides two types of hygrometers, but they work in pretty much the same way. % Relative Humidity (RH), the amount of water vapour present in the air compared to the maximum possible, expressed as a percentage The results of these two measurements are then used to determine: and Wet bulb temperature (Twb), the temperature as read by a thermometer that’s covered in water-soaked fabric over which air is passed. Dry bulb temperature (Tdb), the ambient temperature that is usually thought of as air temperature Whirling hygrometers are designed to measure: Contact Us Request a Catalogue Videos Service & Technical Support Extend Your Warranty Software Downloads Webinars International Standards Product ListĪbout Elcometer Enews Company Policies Terms & Conditions Quality & ISO Certification Exhibition Calendar Careers.'Blast Hose, Nozzle Holders and Couplings.
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