RTDs work on a basic correlation between metals and temperature. Because the temperature of a metal will increase, the metal's resistance to the flow of electricity will increase. Similarly, because the temperature of the RTD resistance part will increase, the impedance, measured in ohms (Ω), increases. RTD components are unremarkable specified according their resistance in ohms at zero degrees Celsius (0° C). The most common RTD's specification is a hundred Ω, which suggests that at 0° C the RTD's part should demonstrate a hundred Ω of resistance.
Platinum is that the most ordinarily used metal for RTD components because of variety of things, together with its
Other metals that are less often used because the resistor components within a RTD include nickel, copper and Balco.
RTD's components are usually in one in every of 3 configurations:
- Chemical immobility,
- Nearly linear temperature versus resistance relationship,
- Temperature constant of resistance that's massive enough to present readily measurable resistance modifications with temperature and
- Stability (in that its temperature resistance doesn't drastically change with time).
Other metals that are less often used because the resistor components within a RTD include nickel, copper and Balco.
RTD's components are usually in one in every of 3 configurations:
- A platinum or metal glass suspension film deposited or screened onto a little flat ceramic substrate called "thin film" RTD components, and
- Platinum or metal wire wound on a glass or ceramic winder and sealed with a coating of liquefied glass called "wire wound" RTD components.
- A partly supported wound part that could be a little coil of wire inserted into a hole in a ceramic insulator and connected on one aspect of that hole. Of the 3 RTD components, the skinny film is most rugged and has become more and {more} more correct over time.