Modifications

== Introduction ==

== Introduction ==

{{bloc-etroit|text=A thermocouple is a kind of temperature sensor.

{{bloc-etroit|text=Un thermocouple est une sorte de senseur de température.

Unlike semiconductor temperature sensors such as the TMP36 , thermocouples have no electronics inside them, they are simply made by welding together two metal wires. Because of a physical effect of two joined metals, there is a slight but measurable voltage across the wires that increases with temperature. The type of metals used affect the voltage range, cost and sensitivity, which is why we have a few different kinds of thermocouples. The main improvement of using a thermocouple over a semiconductor sensor or thermistor is that the temperature range is very much increased. For example, the TMP36 can go from -50 to 150°C, after that the chip itself can be damaged. Common thermocouples on the other hand, can go from -200°C to 1350°C (K type) and there are ones that can go above 2300°C!}}

Au contraire des [http://mchobby.be/PrestaShop/product.php?id_product=59 senseurs de température à semiconducteur comme le TMP36], le thermocouple n'a aucune électronique à l'intérieur, il s'agit de deux fils de métal fondu ensemble en une petite boule.  

 

Because of a physical effect of two joined metals, there is a slight but measurable voltage across the wires that increases with temperature. The type of metals used affect the voltage range, cost and sensitivity, which is why we have a few different kinds of thermocouples. The main improvement of using a thermocouple over a semiconductor sensor or thermistor is that the temperature range is very much increased. For example, the TMP36 can go from -50 to 150°C, after that the chip itself can be damaged. Common thermocouples on the other hand, can go from -200°C to 1350°C (K type) and there are ones that can go above 2300°C!}}

[[Fichier:Thermocouple-01.jpg|640px]]

[[Fichier:Thermocouple-01.jpg|640px]]