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13 Cards in this Set
- Front
- Back
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Seeback Effect |
Causes an electrical potential when two dissimilar wires are joined & one end is heated. (Thermoelectric effect where continuous current is generated in a circuit where the junctions of two dissimilar conductive materials are kept at different temperatures.) |
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Peltier Effect |
Thermoelectric effect where heating and cooling occurs at the junctions of two dissimilar conductive materials when a current flows through the junction |
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Thomson Effect |
A thermoelectric effect where heat is generated or absorbed when an electric current passes through a conductor in which there is a temp gradient |
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Do thermocouples have polarity |
Yes , positive and negative |
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What are some types of thermocouple measurement circuits |
1.Difference thermocouples 2.thermopiles 3.averaging thermocouples 4.pyrometers 5.null-current thermocouples 6.high input impedance |
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Interpolation |
Is used when the voltage is not on the chart. Procedure is to calculate where the voltage falls as a fraction of the total difference and then multiply that by the temp difference and add to the lower temp |
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What are the types of thermocouples |
JERKS TBN |
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How are averaging thermocouples connected |
Parallel |
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How are thermopiles connected |
In series |
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Most widely used thermocouple |
Type J |
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What is a thermistor |
Solid state semiconductor made from sintered metal oxides and lead wires, hermetically sealed in glass |
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What is switch temperature |
Temp where resistance starts to increase rapidly |
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How to correct nonlinear readings of thermistor |
Modify bridge circuit by placing a resistor in parallel with the thermistor |
