What is PCT thermistor?
What is PCT thermistor?
PTC thermistors are resistors with a positive temperature coefficient, which means that the resistance increases with increasing temperature. PTC thermistors are divided into two groups based on the materials used, their structure, and the manufacturing process.
What is the resistance of a PTC thermistor?
Typically, the resistance of a PTC is around ±15 or ±20%.
How do I choose a PTC thermistor?
For example: – A 10k NTC thermistor displays 10k ohm resistance at 25°C and has a negative relationship between temperature and resistance. – A 100k PTC thermistor displays 100k ohm resistance at 25°C and has a positive temperature-resistance relationship.
How many types of PTC are there?
The two types of PTC thermistor have very different characteristics: Switching PTC thermistor: This form of PTC thermistor is used in heaters, sensors and specialised versions are also used as resettable fuses. Switching type NTC thermistors have a highly non-linear curve.
How do I check my PTC thermistor?
Testing a PTC thermistor follows all the same steps as a NTC thermistor. First check, with an ohmmeter, the thermistor without any heat applied. With a PTC thermistor at room temperature or below, the thermistor should measure a very low resistance. Now apply heat, just like before, to the thermistor’s body.
Whats the difference between an NTC and PTC?
Those that decrease are known as negative temperature coefficient (NTC) thermistors, while those that increase are positive temperature coefficient (PTC) thermistors.
What are the 2 types of thermistor?
There are two types of thermistors: Negative Temperature Coefficient (NTC) and Positive Temperature Coefficient (PTC). With an NTC thermistor, when the temperature increases, resistance decreases. Conversely, when temperature decreases, resistance increases.
How do I choose the right thermistor?
5 Essential Considerations When Selecting an NTC Thermistor
- Temperature Range. When choosing a temperature sensor, the first consideration should be the temperature range of the application.
- Noise Immunity.
How do you size a thermistor?
This is determined by using Ohm’s law E ÷ I = R (E = volts, I = current, R = resistance). The D.C. is then calculated by dividing the power dissipated in the NTC thermistor by the temperature difference between the two measured temperatures. Power is calculated by using Ohm’s law, P = E x I.