RTDS Wirings

• 2 Wire Resistance Thermometer Sensor (RTD)

Since a conductor resistance is added to the resistance value. It is necessary to reduce the conductor resistance in advance. This type is not usually used except for a high resistance RTDs.

• 3 Wire Resistance Thermometer Sensor (RTD)

Use to eliminate the effect caused by conductor resistance .Care should be taken for long distance transmission because a variation of resistance of conduction has effect on accuracy. This type rtd temperature sensor of connection is widely used in industrial application 

• 4 wire Resistance Thermometer Sensor (RTD)

This type platinum rtd of connection is used for high accuracy temperature measurement and standards because 4-wire termopar pt100 is not affected by conductor resistance. Generally a constant current and the resistance value are measured by a potential difference.