Presentation on theme: " Temperature sensors are the devices which are used to measure the temperature of an object. These sensors sense the temperature and generate output."— Presentation transcript:
Temperature sensors are the devices which are used to measure the temperature of an object. These sensors sense the temperature and generate output signals in one of two forms: change in voltage or change in resistance In order to select a sensor for a particular application- accuracy, range of temperature, response time and environment are considered.
Temperature sensors are categorized into two types: ◦ Contact type sensors ◦ Non-contact type of sensors Contact type of sensor: This type of sensor is in contact with the service of a material Non-contact type: This type uses thermal radiations emitted by the surrounding material or devices
Contact type of sensor: ◦ Thermocouples ◦ Resistive temperature device Non-contact type of sensor: ◦ IR thermometers: They measure the temperature by detecting the infraredenergy emitted by the material This consist of a lens which senses the IR signal and converts it into electrical signal which is displayed in temperature units. They are used when an object is moving, surrounded byEMF or when a fast response is required.
They are available in a bead or probe type of construction They consist of dissimilar metals that when are heated or cooled will generate a small voltage The voltage developed between the two junctionsis called discreet signal This voltage will be in the millivolt range (0.001)
There are two types: ◦ RTD ◦ Thermistor They work by undergoing change in electrical resistance, with change in temperature They are low cost and wide range of temperature sensing
They work on negative temperature coefficient They are made up of semi-conductor devices They have a wide range of temperature sensing Can be used as a liquid level indicator or as a liquid level controller
This workforce solution was funded by a grant awarded by the U.S. Department of Labor’s Employment and Training Administration. The solution was created by the grantee and does not necessarily reflect the official position of the U.S. Department of Labor. The Department of Labor makes not guarantees, warranties, or assurances of any kind, express or implied, with respect to such information, including any information on linked sites and including, but not limited to, accuracy of the information or tis completeness, timeliness, usefulness, adequacy, continued availability, or ownership. This work by Mineral Area College is licensed under the Creative Commons Attribution 4.0 International License.Creative Commons Attribution 4.0 International License.