The development of temperature and humidity monitor

The development of temperature and humidity monitor

The temperature and humidity in the environment directly affect the growth of animals and plants. Excessively high or low temperature and humidity will affect the health of animals and plants. A serious point will affect their lives. At the same time, temperature and humidity have high requirements in many other areas, in the printing room. Operating rooms, warehouses and so on, the temperature and humidity requirements in these places will be more stringent, the temperature and humidity measurements can use the temperature and humidity monitor, which is one of the environmental recorders, the following to understand the temperature and humidity Inspection history:

The earliest temperature measurement was invented by the Greeks, but the earliest measuring instrument for temperature was created by Italian Galileo in 1592. It is a large glass bulb with a slender neck, inverted in a vessel containing wine, from which a portion of air is drawn and the wine rises into the neck. When the outside temperature changes, the wine in the neck will rise and fall due to the thermal expansion and contraction of the air inside the glass bubble. Therefore, the concave and convex of the wine surface can indicate the temperature and convexity. Actually, this is an indicator without scale. Then, the thermometer slowly changed over the next few hundred years, from the original unscaled temperature measurement to the later slowly changing to using a graduated measurement to the final direct digital display to reduce the error in reading.

The measurement history of the hygrometer can be traced back to China's scale model (179 BC) as the earliest hygrometer measurement, but the specific measurement method is unknown. The measurement of wet and dry hygrometers was in the 18th century. The accuracy of wet and dry hygrometers also depended on the accuracy of the dry and wet bulbs; the hygrometer must be in a ventilated state: only gauze water jackets and water quality. When the wind speed meets certain requirements, the required accuracy can be achieved. The wet and dry hygrometer accuracy is only 5% to 7% RH. The measurement of humidity changed from the original 5% to 7% RH to the current 3% RH, and the detection accuracy in those meteorological aspects was even deeper, and the temperature and humidity were gradually reduced to 0. The two sets together to measure, is the current temperature and humidity monitor, the scope of application of this instrument is still relatively wide, but also because of its high measurement accuracy and wide consumer preferences.