Numerous thermocouple types exist in the industry. They all have different attributes that make them suitable for different types of applications. The materials used to make these instruments also differ. When looking for a thermocouple, there are numerous factors to consider. Choosing the right sensor will ensure accurate temperature measurements and fast response of control processes in the industry.
Thermocouples are normally used to measure temperature. They produce an electrical signal that is proportional to the temperature of the room or environment under test. A potential difference is normally created when the two metal probes are exposed to two different temperatures. Calibration is normally done to ensure that different voltages correspond to their respective 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.
Type B is also popular among thermocouple types. It can measure temperatures of up to 1800 degrees centigrade. However, they can only measure temperatures starting from 50 degrees centigrade accurately. The conductors are made of platinum rhodium alloys with one containing 30 percent rhodium and the other only 6 percent rhodium. It is important to note that the lifetime of thermocouples is limited by the adverse conditions they are normally exposed to. This includes extremely high temperatures and corrosive chemicals among other things. They therefore need to be replaced on a regular basis to ensure that accurate readings are taken all the time. The best thing about thermocouples is that they are affordable.
Thermocouples are normally used to measure temperature. They produce an electrical signal that is proportional to the temperature of the room or environment under test. A potential difference is normally created when the two metal probes are exposed to two different temperatures. Calibration is normally done to ensure that different voltages correspond to their respective 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.
Type B is also popular among thermocouple types. It can measure temperatures of up to 1800 degrees centigrade. However, they can only measure temperatures starting from 50 degrees centigrade accurately. The conductors are made of platinum rhodium alloys with one containing 30 percent rhodium and the other only 6 percent rhodium. It is important to note that the lifetime of thermocouples is limited by the adverse conditions they are normally exposed to. This includes extremely high temperatures and corrosive chemicals among other things. They therefore need to be replaced on a regular basis to ensure that accurate readings are taken all the time. The best thing about thermocouples is that they are affordable.
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