How thermocouple thermometer works?

Answer 1

Couple means a pair. So two dissimilar metals, for example copper and iron, can be taken. Say two copper rods and one iron rod. Now let us weld them keeping iron in-between the two copper rods.

Two junctions will be formed. If both the junctions are at the same temperature, nothing remarkable happens. If one junction is at a higher temperature than the other, then an emf is produced. This emf can be measured as the voltage difference between the two copper rods. It will be very small, in the millivolt or microvolt range.

If such thermocouples are arranged in series then the emf will be added and so considerable emf could be produced.

This happens due to the Seebeck effect, where an electrical potential is formed between two ends of a conductor if the ends are at different temperatures. It is commonly misstated that a potential is formed at the junction between the two metals, but basic physics is that there can be no potential between two conductors in contact.

The thermocouple does not actually measure temperature, but the temperature difference between two points. If the temperature at one point is known (reference junction) then the temperature of the other point (sensing junction) can be calculated.
A thermocouple measures temperature difference (not temperature). A thermocouple is a pair of dissimilar metals wires twisted together that form two metal-to-metal junctions. When the junctions are at different temperatures a small but measurable voltage difference is produced that indicates the difference in temperature between the junctions. The voltage depends on the type of the two metals, but common types are known and the equations or tables are available.

So if you know the temperature of one junction (the reference junction) and the voltage difference, you can calculate the temperature at the other (sensing) junction.

Answer 2

A thermocouple measures temperature. It can also be used to convert temperature grade into electricity. They do not need external sources of energy to be powered, and as a result of their efficiency, accuracy and ease of manufacturing, the small, common builds are quite cheap. The best part is the color-rating system - depending on the conductors used in the manufacturing plant, they can be rated to measure up to thousands of degrees celsius. They are mostly used in the science and industry fields to measure fuel offset and material combustion.

Answer 3

thermocouple is used to measure temperature in terms of voltage output.

it is used in most of industries because of its high temp range and fast response.

Answer 4

The thermocouple is two dissimilar pieces of metal inside a tiny metal bulb. When heated they then generate a tiny electrical charge that opens gives a signal to the gas regulator.

Answer 5

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