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Thermocouples are sensors for determining temperature. They are made of two conductors joined together. When heated or cooled around the junction, a voltage proportional to the magnitude of heating is produced. They are categorized depending on the conductors making them. Type j thermocouple, also referred to as iron-constantan, is a good example of such a category.
The alloy is a junction of iron metal and constantan, which is made of copper and nickel. The iron carries a positive charge and constantan a negative one. The iron in it makes it susceptible to rusting particularly in temperatures below zero degrees Celsius. It has a remarkably wide range of temperature in which it is effective and a high temperature output, this makes it very popular.
It can be used for temperatures from -40 to 750 degrees Celsius. If it is used for temperatures above 760 Celsius degree, an abrupt magnetic transformation that results to decalibration takes place. This range of temperature is beyond what most of the other sensors cover.
The device mostly occurs as a thin wire with remarkably high sensitivity of approximately 55 microvolts per Celsius. Reducing the diameter of the wire enhances sensitivity but reduces the range of temperatures it can cover. It is mostly used with old model equipment which cannot use most of the modern sensors. It is also the standard sensor used in gas chromatographs and mass spectrometers.
The wire can either be bare or ceramic coated. The bare wires can be insulated using any ordinary insulators while the ceramic coated is contained in a ceramic tube. The ceramic tube reduces the chances of shorting and the rate of aging.
The temperatures covered can be increased by proper insulation. If type j thermocouple is coated properly with ceramic, it may be used for temperatures as high as 830 Celsius degrees. This model of sensor is the second most used junction.
The alloy is a junction of iron metal and constantan, which is made of copper and nickel. The iron carries a positive charge and constantan a negative one. The iron in it makes it susceptible to rusting particularly in temperatures below zero degrees Celsius. It has a remarkably wide range of temperature in which it is effective and a high temperature output, this makes it very popular.
It can be used for temperatures from -40 to 750 degrees Celsius. If it is used for temperatures above 760 Celsius degree, an abrupt magnetic transformation that results to decalibration takes place. This range of temperature is beyond what most of the other sensors cover.
The device mostly occurs as a thin wire with remarkably high sensitivity of approximately 55 microvolts per Celsius. Reducing the diameter of the wire enhances sensitivity but reduces the range of temperatures it can cover. It is mostly used with old model equipment which cannot use most of the modern sensors. It is also the standard sensor used in gas chromatographs and mass spectrometers.
The wire can either be bare or ceramic coated. The bare wires can be insulated using any ordinary insulators while the ceramic coated is contained in a ceramic tube. The ceramic tube reduces the chances of shorting and the rate of aging.
The temperatures covered can be increased by proper insulation. If type j thermocouple is coated properly with ceramic, it may be used for temperatures as high as 830 Celsius degrees. This model of sensor is the second most used junction.
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