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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) un “100” (100 omi 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, Izšķirt, Bārts, 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 omi 0 ° C, and this value changes predictably with temperature fluctuations.

Platinum resistors are widely used in the medium temperature range (-200～650℃). Šobrīd, there are standard temperature measuring thermal resistors made of metal platinum on the market, piemēram, Pt100, Pt500, PT1000, utt..

Parasti izmantotās platīna pretestības PT100 sensoru zondes temperatūras mērīšanas diapazons ir -200 ～ 850 ℃, un PT500 temperatūras mērīšana, PT1000 sensoru zondes, utt.. ir secīgi samazināti. PT1000, Temperatūras mērījumu diapazons ir -200 ～ 420 ℃. Saskaņā ar IEC751 starptautisko standartu, Platīna rezistora PT1000 temperatūras raksturlielumi atbilst šādām prasībām: