What is a hygrometer?
Hygrometer is a tool used to measure relative humidity or the amount of invisible water vapor in a given environment. They are coated from simple devices such as psychrometer and hygrometer with hair, more complicated pieces such as hygrometer -cooled mirror dew, which uses condensation temperature to measure moisture. Modern electronic devices can also determine the humidity of changes in electrical resistance and electrical capacity. In addition to meteorological use, hygrometers are useful in many applications, including saunas, museums, residential environments and HVAC industry.
The psychrometer consists of two thermometers, one with a bulb, which is dry and the other with wet, and uses evaporation cooling to measure moisture. As the humidity evaporates from the wet bulb, the temperature decreases and the relative humidity is calculated from the difference in temperatures between the thermometers of the wet and the dry bulbs using the apsechrometric graph. The simplest hydrometer, a sliding psychrometer, uses this wet/dry bulb method with the thermometers namontova thermometersby a chain or rope that turns in the air.
Condensation hygrometer or "chilled mirror points" is the most accurate tool available. The electronic feedback controls the temperature of the chilled mirror exposed to the open air and maintains a dynamic balance between evaporation and condensation on the mirror. The optoelectronic mechanism detects condensation on the mirror surface and measures the dew point temperature, or the point at which the air is thus saturated can no longer maintain its water vapor and condensation occurs.
Hair hygrometer uses hair under tension to measure moisture. When the relative humidity increases, the hair extends and when it drops, the hair is shortened. This tool uses the strands of human hair or horses connected to the lever of the lever increases small length changes. Hygrograph, consisting of an inkjet pen and a rotating cylinder, records changes in humidity throughout the day. Hygrometers of hair are not soEsna as their counterparts and record significant mistakes with very high and very low relative humidity.
electronic devices measure moisture using electrical resistance materials that differ in the amount of absorbed moisture. The two most common are capacitive and resistant sensors. Capacitive sensors operate by measuring changes in the amount of water in the air by means of an electrical signal between two plates. Resistance sensors use a polymeric membrane that registers changes in conductivity when water is absorbed.