Difference Between RTD vs Thermocouple

rtd vs thermocouple

Temperature sensors that can withstand thousands of Fahrenheit is important in choosing between RTD or Thermocouple, as well as the budget to be used in installing and maintaining these sensors. Although both can outdo each other, in this battle, you have to be keen in knowing the benefits as well as the downside of them.

A closer view of their characteristics:

The materials used in RTD are pure, fine, coiled wire material that is wrapped with ceramic or glass to make it more durable. Thermocouples are a couple of different wires that are joined only at one end and is made in consideration with resistance to chemicals, abrasion and vibration.

Their temperature measurement also varies greatly. As for the RTD, it can measure from -400 to 1200 Fahrenheit; and Thermocouple has various temperature measurement depending on the kind of wire used to make it – up to 4200 Fahrenheit.

There is also a good response time in sensing the temperature with the use of a Thermocouple than with an RTD, which has a slower one. And the best difference between them is the price. Although, RTD will cost lesser in installation, the cost of buying and maintaining it will not be a budget-saver. Thermocouple may cost higher in installation, but it surely is a big winner in the future.

Following are key Difference Between RTD vs Thermocouple

RTD Thermocouple
Annotation Resistance Temperature Detectors are sensors that measures temperature. Consist of two dissimilar metals, joined together at one end
Operation Operate on the rationale that the impedance of metals alters in a certain way based on the temperature fall and rise measurement. Generate the different contact point leading to the measurement of temperature. Best suited for rugged applications
Bad Side Overall temperature range , which is small and RTD’s starting cost which is much higher when compared to thermocouple Wide range of accuracy particularly at elevated temperatures. This is difficult to recalibrate depending upon the environmental conditions.
Good side Provides reliable output over a period. The calibration of RTD outcome is much easier than other measurements, offer an accurate reading for narrowed temperature twains. Offer a wide range of measurement, ranging between three hundred Fahrenheit and twenty three thousand Fahrenheit, Speed of measurement is faster, less investment and high durability

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