What does a PTC thermistor do?
Over-current protection Switched PTC thermistors are used as over-current limiters or resettable fuses in various circuits. In the case of an over-current situation, the thermistor body temperature rises and quickly reaches the transition temperature.
How does a thermistor temperature sensor work?
Thermistors are temperature-dependent resistors, changing resistance with changes in temperature. They are very sensitive and react to very small changes in temperature. They are best used when a specific temperature needs to be maintained, and when monitoring temperatures within 50°C of ambient.
What is the difference between PTC and NTC sensor?
There are two separate types of thermistors available on the market today: NTC and PTC. PTC stands for positive temperature coefficient and NTC is negative temperature coefficient. An NTC’s resistance will decrease with temperature; where as, the resistance from PTCs will increase.
Why PTC is used in motor?
In particular, PTC thermistors are used as motor protection sensors to protect the motors from overheating. Highly reliable protection can be realized by thermally bonding three motor protection sensors to a winding of a motor (stator side) as shown in the diagram below.
Where are PTC thermistors used?
PTC Uses: PTC thermistors can be used in place of fuses for circuit protection. As the circuit heats up, resistance increases to prevent overload. They are also used as timing devices in televisions.
Do thermistors measure temperature?
Thermostats measure the temperature of the room that they are placed in via an air sensor and/or a floor sensor.
What is a PTC temp sensor?
Positive Temperature Coefficient (PTC) thermistor temperature sensors are devices that exhibit an increase in resistance in response to an increase in temperature.
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.