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The main difference between an RTD and a Pt100 is the material used for the sensing element: PT100 is a specific type of RTD thermal resistor, and its name comes from “Platinum” (platinum) i “100” (100 ohms at 0°C). It is the most commonly used RTD sensor and is widely used in industrial process control, laboratory measurement and other fields that require high-precision temperature monitoring. The advantages of PT100 include:

The thermal resistance formula is in the form of Rt=Ro(1+A*t+B*t*t);Rt=Ro[1+A*t+B*t*t+C(t-100)*t*t*t], t represents Celsius temperature, Ro is the resistance value at zero degrees Celsius, A, B, C are all specified coefficients, for Pt100, Ro is equal to 100℃.

A PT100 sensor acquires temperature by measuring the change in its electrical resistance, which directly correlates to the temperature it is exposed to; as the temperature increases, the resistance of the platinum element within the sensor also increases, allowing for a precise calculation of the temperature based on this resistance change; essentially, the “100” in PT100 signifies that the sensor has a resistance of 100 ohms at 0°C, and this value changes predictably with temperature fluctuations.

Platinasti otpornici se široko koriste u rasponu srednjih temperatura (-200～650℃). Trenutno, Na tržištu postoje standardni termootpornici za mjerenje temperature od metalne platine, kao što je Pt100, Pt500, Pt1000, itd.

The temperature measurement range of the commonly used platinum resistance Pt100 sensor probes is -200～850℃, and the temperature measurement ranges of Pt500, Pt1000 sensor probes, itd. sukcesivno se smanjuju. Pt1000, temperature measurement range is -200～420℃. Prema međunarodnom standardu IEC751, temperaturne karakteristike platinskog otpornika Pt1000 ispunjavaju sljedeće zahtjeve: