Resistance temperature detector or RTD sensors are amongst the most commonly used kinds of temperature sensors in industrial applications. While thermistors and thermocouples are very popular as well, but RTDs are thought better in terms of the stability they feature over a time period and accuracy over a variety of temperature. Both these factors make sure they are a good choice for numerous industrial applications.
The foundation of and RTD is that it works such as for instance a resistor that changes its value with change in temperature. Several materials have a characteristic that allows a predictable resistance temperature detector change in their resistance with change in temperature. This makes acquiring highly consistent and accurate temperature measurements quite easy. Most RTDs respond between 0.5 to 5 seconds. RTDs could be constructed using different materials, including copper, platinum, and nickel.
RTDs utilized in different applications could have different specifications. The Temperature coefficient of resistance and base resistance are amongst the main specifications for RTDs. Base resistance value can differ remarkably and be determined by the material; from 10 Ohms to thousands of Ohms.
The temperature coefficient of resistance is important to the instrument that is being utilized in measuring temperature changes with regards to the base resistance, and has nothing regarding the accuracy of the sensor.
If we consider the working of thermistors, thermocouples, and RTDs, we find that RTDs tend to be more stable and accurate over time. RTDs are highly repeatable as well. What this means is they can precisely calculate similar temperatures with minimum discrepancies, even when they are utilized in repeated cooling and heating cycles. On one other hand, a thermocouple is less precise and can deliver values with few discrepancies. As the majority of the industrial applications can perform without instant responses to changes in temperature, RTDs are thought a good solution for them.
When you are considering buying RTDs, you should ensure that you aspect in the accuracy offered by the sensor in different industrial settings. Is the RTD sensor you will buy rugged enough for the harsh environment you will undoubtedly be tried it in?
Resistance temperature detectors are utilized in a number of applications, including flame-proof and explosion-proof applications. Even with all these benefits, you still need to make sure you buy the proper sensor from the proper place. Consider your requirements and then try to find RTD sensors that fit them perfectly. You can go online try to find companies that provide RTDs, thermocouples, and thermistors.