The Elcometer 114 Dewpoint Calculator provides accurate values of Dewpoint and Relative Humidity (RH) from the wet and dry bulb temperatures measured by a Whirling or Sling Hygrometer. The range of the Elcometer 114 is -10°C to 50°C and has an accuracy of ±1% with respect to standard tables.
When measuring climatic parameters using a whirling hygrometer, also known as a sling pyschrometer, once you have your wet bulb and dry bulb temperature measurements, these are then used to determine the relative humidity and dewpoint temperature.
Typically, conversion tables, like the ones supplied with the Elcometer 116 Hygrometers, are used to do this. Alternatively, a quicker and easier method is to use the Elcometer 114 Dewpoint Calculator.
Once you have your wet bulb and dry bulb temperatures, looking at the top half of the disc, on scale 1, align the wet bulb temperature with the dry bulb temperature.
Then in scale 2, locate the wet bulb temperature again, and read the measurement that it aligns with. This is your dewpoint temperature.
Secondly, looking at the bottom half of the disc, on scale 3, align the dewpoint temperature with the dry bulb temperature. This reveals your relative humidity in the window above. It’s that simple!
You’ll notice that the temperatures on the disc are in Celsius (°C), but if you require the temperatures in Fahrenheit (°F), there’s a convertor located in the middle of the calculator.
