Pt100 resistor is a linear negative temperature coefficient thermistor. The zero resistance value is 100 ohms. When the temperature changes by 1 degree, the electric positive changes steadily. PTC is a positive temperature coefficient thermistor, whose resistance increases with the increase of temperature, and the resistance jumps at the Curie temperature point. It is not the same. Both are due to thermal resistance, and the resistance value changes with the change of temperature. However, the functions and uses of these two are different. PTC stands for positive temperature coefficient, a thermistor, which is a thermistor whose resistance value increases with the increase of temperature. This type of thermistor has a wide range of applications in maintenance circuits. For example, a PTC thermistor is installed in the maintenance circuit, and when the temperature around the thermistor rises to a certain temperature threshold, the resistance value of the thermistor becomes very large, thus disconnecting the circuit. When the temperature drops, it automatically turns off. Deep recovery sleep, so as not to damage the entire circuit. In PT100, PT is the symbol of platinum, and 100 means that the resistance value of PT100 is 100 ohms at 0 degrees. PT100 is an electro-positive temperature sensor, which uses platinum to change resistance according to temperature changes. The commonly used temperature range is -200 to 650 degrees. This sensor is usually used with a temperature controller, but it only detects temperature changes and has no control effect.

First: PTC thermistor cannot be directly connected to PLC. What is connected to PLC is actually a temperature switch, which can be divided into normally open and normally closed. When the temperature rises to the temperature switch threshold, the temperature switch starts to work and inputs the switch signal into PLC to control the motor to stop or slow down. The temperature switch is usually installed around the motor winding and close to the winding coil. Second: PT100 is used for motor bearings. PT100 is usually connected to the temperature controller to display the temperature of the bearing and is installed on the bearing or on the support of the bearing bushing. Third: Why use PTC on the winding and PT100 on the bearing? The winding PTC is to prevent the motor winding from burning due to high temperature. When the temperature reaches a certain value, it will usually stop directly through the alarm. Using PT100 as a bearing can control the speed of the motor in the following way: You can display the temperature value. Fourth: The PT100 in the bearing is pre-buried and the wire is pulled out from the periphery. Which junction box it is connected to depends on where it is used. Fifth: On the principle of PT100 and PTC, the principle of PT100 and PTC is the same, but the thermal curve is different.

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