Resistance temperature detector or RTD sensors are amongst probably the most commonly used types of temperature sensors in industrial applications. While thermistors and thermocouples can be popular as well, but RTDs are considered better in terms of the stability they give over a time frame and accuracy over a variety of temperature. Both these factors cause them to become a great choice for numerous industrial applications.
The cornerstone 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 enables 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 may be constructed using different materials, including copper, platinum, and nickel.
RTDs used in different applications might have different specifications. The Temperature coefficient of resistance and base resistance are amongst the main specifications for RTDs. Base resistance value can vary remarkably and rely on the material; from 10 Ohms to several thousand Ohms.
The temperature coefficient of resistance is vital to the instrument that is being used in measuring temperature changes with respect to the base resistance, and has nothing related to the accuracy of the sensor.
If we consider the working of thermistors, thermocouples, and RTDs, we find that RTDs are far more stable and accurate over time. RTDs are highly repeatable as well. This implies that they’ll precisely calculate similar temperatures with minimum discrepancies, even though they’re used in repeated cooling and heating cycles. On another hand, a thermocouple is less precise and can deliver values with few discrepancies. As the majority of the industrial applications may do without instant responses to changes in temperature, RTDs are considered a great solution for them.
When you are considering buying RTDs, you should make sure that you element in the accuracy offered by the sensor in different industrial settings. Could be the RTD sensor you will buy rugged enough for the harsh environment you will be tried it in?
Resistance temperature detectors are used in a number of applications, including flame-proof and explosion-proof applications. Despite having each one of these benefits, you still need certainly to make sure you buy the proper sensor from the proper place. Consider your requirements and then look for RTD sensors that fit them perfectly. You can go online look for companies that provide RTDs, thermocouples, and thermistors.