Thermocouple and thermal resistance of the differences

In the understanding of people, could have such an idea, thermocouple and thermal resistance are measured temperature sensor, why is divided into two kinds of way? The nature of what the difference? Below small make up to answer to everyone. Thermal resistance can see from the name, its itself is the resistance, when the temperature changes, so that the change of resistance is a positive or negative; The thermocouple used it but not resistance voltage, the voltage will change with the change in temperature. And these two components they can detect the range of temperature is different, only in the range of 0 - thermal resistance detection 150 ° between, also can only achieve 600 °. Thermocouple heat resistance is much higher in this respect, it can reach 1000 or more. Thermal resistance and thermocouple on the materials used by the material is different, the resistance is sensitie to metal materials; And thermocouple is used double metal, so they are also different in the potential difference. When the thermal resistance and thermocouple connected to the PLC, the signal is also not the same as they transfer out, heat resistance is the PTD signals, thermocouple is TC signal. But the price on the thermocouple to the cost of a specific heat resistance on the high prices of many, you can choose according to their own information needed for the use of thermal resistance and thermocouple.