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  2. Four-terminal sensing - Wikipedia

    en.wikipedia.org/wiki/Four-terminal_sensing

    Four-point measurement of resistance between voltage sense connections 2 and 3. Current is supplied via force connections 1 and 4. In electrical engineering, four-terminal sensing (4T sensing), 4-wire sensing, or 4-point probes method is an electrical impedance measuring technique that uses separate pairs of current-carrying and voltage-sensing electrodes to make more accurate measurements ...

  3. Silicon bandgap temperature sensor - Wikipedia

    en.wikipedia.org/wiki/Silicon_bandgap...

    A circuit that forces I C1 and I C2 to have a fixed N:1 ratio, [2] gives the relationship: = ⁡ An electronic circuit, such as the Brokaw bandgap reference, that measures ΔV BE can therefore be used to calculate the temperature of the diode. The result remains valid up to about 200 °C to 250 °C, when leakage currents become large enough to ...

  4. Resistance thermometer - Wikipedia

    en.wikipedia.org/wiki/Resistance_thermometer

    The R vs T relationship is defined as the amount of resistance change of the sensor per degree of temperature change. [1] The relative change in resistance (temperature coefficient of resistance) varies only slightly over the useful range of the sensor. [citation needed]

  5. Thermistor - Wikipedia

    en.wikipedia.org/wiki/Thermistor

    An NTC is commonly used as a temperature sensor, or in series with a circuit as an inrush current limiter. With PTC thermistors, resistance increases as temperature rises; usually because of increased thermal lattice agitations, particularly those of impurities and imperfections. PTC thermistors are commonly installed in series with a circuit ...

  6. Thermocouple - Wikipedia

    en.wikipedia.org/wiki/Thermocouple

    A thermocouple, also known as a "thermoelectrical thermometer", is an electrical device consisting of two dissimilar electrical conductors forming an electrical junction.A thermocouple produces a temperature-dependent voltage as a result of the Seebeck effect, and this voltage can be interpreted to measure temperature.

  7. Thermowell - Wikipedia

    en.wikipedia.org/wiki/Thermowell

    A temperature sensor, such as a thermometer, thermocouple, or resistance temperature detector, is inserted in the open end of the tube, which is usually in the open air outside the piping or vessel and any thermal insulation. Thermodynamically, the process fluid transfers heat to the thermowell wall, which in turn transfers heat to the sensor ...

  8. Indoor–outdoor thermometer - Wikipedia

    en.wikipedia.org/wiki/Indoor–outdoor_thermometer

    In an indoor–outdoor thermometer based on a conventional liquid-in-glass thermometer, the stem of the outdoor thermometer is connected to the bulb by a long, flexible or semi-rigid capillary. The temperature scale is marked on the stem as usual. However, the temperature that is actually measured is the temperature at the bulb. [1]

  9. Infrared thermometer - Wikipedia

    en.wikipedia.org/wiki/Infrared_thermometer

    The most common infrared thermometer is the spot infrared pyrometer or infrared pyrometer, which measures the temperature at a spot on a surface (actually a relatively small area determined by the D:S ratio). These usually project a visible red dot onto the center of the area being measured that identifies the spot being measured, but plays no ...

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