There are numerous thermocouple types in the market. Each of these thermocouples have different properties that make them suitable for a wide range of applications. Different types of metals are normally used to make these temperature sensing devices. Several factors must be considered during the search for the right thermocouple. It is important to ensure that the right thermocouple has been chosen.
A thermocouple is an electrical device or sensor used to measure temperature. Thermocouples normally have two conductors that are dissimilar. When exposed to different temperatures, a potential difference is created between the two junctions. The amount of voltage created depends on the temperature difference between the two ends. The device is calibrated linearly such that certain voltages represent specific temperatures.
The categories of thermocouples is based on the materials used to make the device. Examples of devices include type B, E, C, M, N, T, K, J and R. The different categories can measure temperatures of different ranges. For the device to work, the two junctions must be fabricated using two different types of materials.
In industrial control processes, thermocouples are preferred to thermometers because they produce an electrical signal that can be used in feedback control process. Consider a boiler or industrial furnace with temperatures that can melt glass. In such a case, a glass thermometer cannot be used. Even if this type of thermometer can be used, an electrical signal can be difficult to obtain.
In the manufacturing, assembly and processing industries, type K thermocouples are normally used in temperature sensing and control systems. The junctions are made of nickel-chromium alloy, and nickel-aluminum-manganese-silicon alloy. The temperature sensing device can measure temperatures starting from -200 degrees to around 1350 degrees centigrade. Conductors that act as the negative probe normally have a red color while yellow is used for the positive conductor or probe.
Type N is also very common. It is made of Nicrosil-Nisil alloy. They can measure between -270 to 1300 degrees centigrade. It is preferred because of its oxidation resistance and stability properties. It was specifically developed to overcome the shortcomings associated with earlier thermocouples. Noel A Burley was the inventor of this temperature measuring device.
Type R thermocouples are made of platinum and its alloy. The device can measure of up to a maximum of 1600 degrees centigrade. Pure platinum is used to make the negative junction whereas a platinum-rhodium alloy is used to make the positive conductor. This is a versatile device that can be used in a number of industrial applications.
One of the most popular thermocouple types is the type B thermocouple. The device can measure temperatures ranging from 50 to 1800 degrees centigrade. The device cannot provide accurate readings for temperatures that are below 50 degrees centigrade. The two conductors are both made of platinum rhodium alloy. One conductor is made of an alloy containing 6 percent rhodium while the other alloy conductor contains 30 percent rhodium. The lifetime of thermocouples is normally short because of the adverse conditions the conductors are normally exposed to. For instance, most thermocouples are normally exposed to extremely high temperatures and harsh chemicals.
A thermocouple is an electrical device or sensor used to measure temperature. Thermocouples normally have two conductors that are dissimilar. When exposed to different temperatures, a potential difference is created between the two junctions. The amount of voltage created depends on the temperature difference between the two ends. The device is calibrated linearly such that certain voltages represent specific temperatures.
The categories of thermocouples is based on the materials used to make the device. Examples of devices include type B, E, C, M, N, T, K, J and R. The different categories can measure temperatures of different ranges. For the device to work, the two junctions must be fabricated using two different types of materials.
In industrial control processes, thermocouples are preferred to thermometers because they produce an electrical signal that can be used in feedback control process. Consider a boiler or industrial furnace with temperatures that can melt glass. In such a case, a glass thermometer cannot be used. Even if this type of thermometer can be used, an electrical signal can be difficult to obtain.
In the manufacturing, assembly and processing industries, type K thermocouples are normally used in temperature sensing and control systems. The junctions are made of nickel-chromium alloy, and nickel-aluminum-manganese-silicon alloy. The temperature sensing device can measure temperatures starting from -200 degrees to around 1350 degrees centigrade. Conductors that act as the negative probe normally have a red color while yellow is used for the positive conductor or probe.
Type N is also very common. It is made of Nicrosil-Nisil alloy. They can measure between -270 to 1300 degrees centigrade. It is preferred because of its oxidation resistance and stability properties. It was specifically developed to overcome the shortcomings associated with earlier thermocouples. Noel A Burley was the inventor of this temperature measuring device.
Type R thermocouples are made of platinum and its alloy. The device can measure of up to a maximum of 1600 degrees centigrade. Pure platinum is used to make the negative junction whereas a platinum-rhodium alloy is used to make the positive conductor. This is a versatile device that can be used in a number of industrial applications.
One of the most popular thermocouple types is the type B thermocouple. The device can measure temperatures ranging from 50 to 1800 degrees centigrade. The device cannot provide accurate readings for temperatures that are below 50 degrees centigrade. The two conductors are both made of platinum rhodium alloy. One conductor is made of an alloy containing 6 percent rhodium while the other alloy conductor contains 30 percent rhodium. The lifetime of thermocouples is normally short because of the adverse conditions the conductors are normally exposed to. For instance, most thermocouples are normally exposed to extremely high temperatures and harsh chemicals.
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