Modern technological advancements have resulted into development of many thermocouple types to suit various applications. Although there are several types of thermocouples, the working principles are the same across all of them. Basically, this device consists of dissimilar conductors, which make contact and produce a voltage when warmed or heated. The amount of voltage generated depends on the difference in temperature between the metal junction and other components of the circuit.
Thermocouples stand among the most widely used kinds of temperature sensing devices in use currently. They are used in controlling, measuring, and sometimes changing temperature gradients into electrical energy. Commercial thermocouples are cheap and could be changed if they become malfunctional. They are availed with standard connectors and can be used to gauge a huge range of temperatures. Thermocouples vary from other kinds of sensors since they do not need exterior excitation and they are normally self-powered.
Certain metal alloys with repeatable and expected relationships between temperature and voltages are applied in the production of these equipment. Different ranges of temperature function best with certain metal alloys. Intermediate connections could be constructed using extension cables if the measurement points are far from the sensors. Cheaper materials may be used to make the extension.
Since there are many kinds of thermocouples, when choosing, one should consider probe construction, insulation, and model. These variables affect the reliability, range, and accuracy of the readings. The device should not limit the range of temperature that needs to be measured. Major models to choose from include type K, E, J, N, B, R, and S. All these models vary in characteristics, materials, and range of temperature they can measure. Some are general purpose while other are used on specific applications.
Type K models are low price general purpose gadgets. They are the most utilized and as such, they come in a variety of probes. They may be applied in any application except if stated otherwise. Their sensitivity is around 41 uV per degree Centigrade and are able to measure temperatures within -200 to 1200 degrees Centigrade. Alumel and Chromel metal alloys are utilized in their construction.
Type J sensor is non-magnetic and greatly sensitive. Its sensitivity is estimated to be 68uV/ degree Celsius. Because of its sensitivity, it is good for use on applications that involve low temperature. Type J is 2nd in terms of fame after K. Its metal junction consists of constantan and iron and it can be utilized for temperature range of between -40 to +750 degrees Centigrade. Use below the temperatures of +760 degrees Centigrade is not recommendable.
Type N is meant to be an enhancement of type K thermocouples. It is a nice selection for high temperature activities. It is a low price model with the capability to resist oxidation in high temperature. Because of its properties, it is becoming more popular. Types S, R, and B are known as noble metal thermocouples, hence therefore they exhibit same characteristics.
Thermocouple types vary in sensitivity hence their uses. The high stability of type S makes it to be used as a standard for calibration of gold. S model is very costly and has low sensitivity making it unsuitable for use on general applications.
Thermocouples stand among the most widely used kinds of temperature sensing devices in use currently. They are used in controlling, measuring, and sometimes changing temperature gradients into electrical energy. Commercial thermocouples are cheap and could be changed if they become malfunctional. They are availed with standard connectors and can be used to gauge a huge range of temperatures. Thermocouples vary from other kinds of sensors since they do not need exterior excitation and they are normally self-powered.
Certain metal alloys with repeatable and expected relationships between temperature and voltages are applied in the production of these equipment. Different ranges of temperature function best with certain metal alloys. Intermediate connections could be constructed using extension cables if the measurement points are far from the sensors. Cheaper materials may be used to make the extension.
Since there are many kinds of thermocouples, when choosing, one should consider probe construction, insulation, and model. These variables affect the reliability, range, and accuracy of the readings. The device should not limit the range of temperature that needs to be measured. Major models to choose from include type K, E, J, N, B, R, and S. All these models vary in characteristics, materials, and range of temperature they can measure. Some are general purpose while other are used on specific applications.
Type K models are low price general purpose gadgets. They are the most utilized and as such, they come in a variety of probes. They may be applied in any application except if stated otherwise. Their sensitivity is around 41 uV per degree Centigrade and are able to measure temperatures within -200 to 1200 degrees Centigrade. Alumel and Chromel metal alloys are utilized in their construction.
Type J sensor is non-magnetic and greatly sensitive. Its sensitivity is estimated to be 68uV/ degree Celsius. Because of its sensitivity, it is good for use on applications that involve low temperature. Type J is 2nd in terms of fame after K. Its metal junction consists of constantan and iron and it can be utilized for temperature range of between -40 to +750 degrees Centigrade. Use below the temperatures of +760 degrees Centigrade is not recommendable.
Type N is meant to be an enhancement of type K thermocouples. It is a nice selection for high temperature activities. It is a low price model with the capability to resist oxidation in high temperature. Because of its properties, it is becoming more popular. Types S, R, and B are known as noble metal thermocouples, hence therefore they exhibit same characteristics.
Thermocouple types vary in sensitivity hence their uses. The high stability of type S makes it to be used as a standard for calibration of gold. S model is very costly and has low sensitivity making it unsuitable for use on general applications.
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