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Wet bulb requires it to be... you know... wet. Not very practical to include in your electronics. I don't know exact method used but I can assure you, there i
by lmilcin 5y ago
Wet bulb requires it to be... you know... wet.
Not very practical to include in your electronics.
I don't know exact method used but I can assure you, there is no water reservoir in any of my gadgets:)
- bumby 5y agoIt looks like I’m confusing a classic psychrometer with more modern ones. The modern ones still use absorption of water to change some physical property like capacitance or resistance but this is also why they need to be continually calibrated against a true dry/wet bulb hygrometer. My experience is that they tend to get out of cal quite often which can lead to bad scenarios, like if using enthalpy setback for air-handling
- lmilcin 5y agoWell, wet bulb thermometer works specifically by evaporating water and measuring temperature. Psychometer is completely different idea. Yes, measuring humidity reliably is a difficult problem as basically any other measurement that requires direct exposure of eroding/corroding components and fragile electronics to elements.
- bumby 5y agoI believe a psychrometer operates on the same principle. "A psychrometer, or a wet and dry-bulb thermometer, consists of two calibrated thermometers, one that is dry and one that is kept moist with distilled water on a sock or wick. At temperatures above the freezing point of water, evaporation of water from the wick lowers the temperature, such that the wet-bulb thermometer will be at a lower temperature than that of the dry-bulb thermometer. " https://en.wikipedia.org/wiki/Hygrometer https://en.wikipedia.org/wiki/Hygrometer The psychrometer just compares the wet and dry bulb temperatures to arrive at a relative-humidity value. I.e., it still operates on the principle of a wet-bulb thermometer.