RTD (Resistance Temperature Detector)

are seonsor used to measure temperature by Correlating the resistancenof the RTD element with temperature. Morst RTD elements sonsist of length of fine coiled wirewrappen around a ceramic of glass core.  The element is usually quire fragile, so it  is  offen place inside a sheathed probe to protect it.  RTD element is made from a pure matierial whose resistance at vaious temperature has been documented.  The material has a predicatable change in resistance as the temperature changes; this predictable change is used to determine temperature.

Platinum RTD:  PT100 , PT500,  PT1000

Acceptable error telerance :  Din Class A, Din Class B, Class 1/3 DIn,  Class1/5 Din ,  Class 1/10 Din 

Resistance elements include Platinum, Nickel, Copper, and other components. Platinum is the most popular and accurate  type.

1.    Platinum RTD

a)      Current: 5mA, 2mA, 1mA

  A grade: 2mA, 1mA

  JIS standard: 2mA, 1mA, 0.5mA

b)      Category

·         Pt100 means when the temperature is 0°C, the resistance for the element is 100Ω

·         JPt100 is Japanese stadnard