What does NTC sensor mean?
Negative Temperature Coefficient
When we are discussing NTCs we are referring to a type of temperature sensor; an NTC thermistor. In this instance, NTC defines as “Negative Temperature Coefficient”. Thermistors measure temperature by measuring the resistance of the electrical energy passing through the thermistor which is relative to temperature.
How does NTC sensor work?
With an NTC thermistor, when the temperature increases, resistance decreases. Conversely, when temperature decreases, resistance increases. When temperature increases, the resistance increases, and when temperature decreases, resistance decreases. This type of thermistor is generally used as a fuse.
What is a NTC thermistor used for?
NTC Thermistors are used to measure temperature in various applications, some of these applications are; Medical applications. Patient monitoring. Industrial processing.
Where is NTC thermistor used?
NTC thermistors are used as ICLs (inrush current limiters) to protect circuits of electrical and electronic devices against inrush currents easily and effectively.
Which is better NTC or PTC?
The NTC thermistor provides variable resistance based on temperature. For an NTC thermistor, as temperature increases, resistance decreases. For a PTC thermistor as temperature increases, resistance increases.
What is the difference between NTC and PTC sensor?
An NTC, or negative temperature coefficient, thermistor’s resistance value decreases as the temperature increases. These are also often used as temperature sensing devices within a circuit. A PTC, or positive temperature coefficient, thermistor’s resistance value will increase as the temperature rises.
What are thermistors made of?
Thermistors are made from semiconductor materials, typically metallic oxides, using cobalt, manganese, or nickel. The temperature–resistance relationship in a thermistor is nonlinear and negative, as shown in Equation 1.10.
What is the sensitivity of NTC thermistor?
The high sensitivity of an NTC thermistor makes it an ideal candidate for temperature sensing ap- plications. These low-cost NTC sensors are normally used for a temperature range of 0 °C to +300 °C.
What is self-heating and how does it affect the NTC sensor?
Self-Heating ¶ A constant voltage supply to the NTC sensor causes it to heat up and therefore creates unreliable temperature values. So it’s recommended to only supply the NTC sensor (and voltage divider) during the actual measurement.
Why is my NTC sensor temperature reading unreliable?
A constant voltage supply to the NTC sensor causes it to heat up and therefore creates unreliable temperature values. So it’s recommended to only supply the NTC sensor (and voltage divider) during the actual measurement. More info here. To do this, replace the 3.3V side of the voltage divider with a connection to a GPIO pin.
What is the NTC platform and how does it work?
The ntc platform is a helper sensor that allows you to convert resistance readings from a NTC thermistor to temperature readings. First, you need to get resistance readings from the sensor – you can set this up with the resistance and adc sensors. This platform will then convert the resistance values to temperature readings.