Sensor classification.plastic pipe connectors

　　Temperature sensor

　　The device collects information about temperature from the source and converts it into a form that can be understood by other devices or people. The best example of a temperature sensor is a glass mercury thermometer, which expands and contracts as the temperature changes. The external temperature is the source of temperature measurement, and the observer looks at the position of the mercury to measure the temperature. There are two basic types of temperature sensors:

　　· Contact sensor

　　This type of sensor requires direct physical contact with the sensed object or medium. They can monitor the temperature of solids, liquids and gases over a wide temperature range.

　　· Non-contact sensor

　　This type of sensor does not require any physical contact with the object or medium being detected. They monitor non-reflective solids and liquids, but are useless against gases due to their natural transparency. These sensors measure temperature using Planck's law. The law deals with heat radiated from a heat source to measure temperature.

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