Temperature sensors
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Temperature sensors
Temperature sensors are vital to a variety of everyday products. Chemical engineering requires precise, quantitative measurements of temperature in order to accurately control a process. This is achieved through the use of temperature sensors, and temperature regulators which process the signals they receive from sensors.
Temperature sensors are devices used to measure the temperature of a medium. There are 2 kinds on temperature sensors: contact sensors and noncontact sensors. However, the 3 main types are thermometers, resistance temperature detectors, and thermocouples. All three of these sensors measure a physical property (i.e. volume of a liquid, current through a wire), which changes as a function of temperature. In addition to the 3 main types of temperature sensors, there are numerous other temperature sensors available for use.
Contact sensors
Contact temperature sensors measure the temperature of the object to which the sensor is in contact by assuming or knowing that the two (sensor and the object) are in thermal equilibrium, in other words, there is no heat flow between them.
Thermocouples
Resistance Temperature Detectors (RTDs)
Full System Thermometers
Bimetallic Thermometers
Noncontact sensors
Most commercial and scientific noncontact temperature sensors measure the thermal radiant power of the Infrared or Optical radiation received from a known or calculated area on its surface or volume within it. An example of noncontact temperature sensors is a pyrometer.