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Temperature Sensor Overview
There are two temperature sensing methods:
  • Contact
  • Non-contact
Contact sensing brings the sensor in physical contact with a substance or object. It can be used with solids, liquids or gases. Non-contact (infrared) temperature sensing reads temperature by intercepting a portion of the infrared energy emitted by an object or substance, and detecting its intensity. Non-contact is used to sense the temperature of solids and liquids. Non-contact cannot be used on gases due to their transparent nature