What is the resistance of NTC thermistor?
NTC thermistors are usually characterised by their base resistance at room temperature, that is 25oC, (77oF) as this provides a convenient reference point. So for example, 2k2Ω at 25oC, 10kΩ at 25oC or 47kΩ at 25oC, etc.
How do you calculate NTC thermistor resistance?
The actual resistance values of a particular NTC thermistor are obtained by multiplying the ratio RT/R25 (tabulated value) by the resistance value at 25 °C (specified in the data sheets).
How does the resistance of a NTC thermistor vary with temperature?
With an NTC thermistor, when the temperature increases, resistance decreases. Conversely, when temperature decreases, resistance increases.
What is NTC in thermistor?
NTC is an acronym for Negative Temperature Coefficient. TE Connectivity (TE) is a leading designer and manufacturer of high precision discrete NTC thermistors, probes, and assemblies. An NTC thermistor is a temperature sensor that uses the resistance properties of ceramic/metal composites to measure the temperature.
What is the nature of resistance to temperature graph of a thermistor?
Explanation: The resistance to temperature graph of a thermistor has a decreasing nature. When the temperature of the Thermistor increases, then the value of its resistance decreases.
What is NTC value?
NTC Thermistor Beta A thermistor’s “b” value, or beta value, is an indication of the shape of the curve representing the relationship between resistance and temperature of an NTC thermistor.
How is NTC thermistor temperature calculated?
NTC (%/°C) × Temperature Tolerance (± °C) = ± % Resistance Tolerance. For example, to determine the resistance tolerance of a Curve 44 thermistor with a ± 0.2 ̊C tolerance at 100 ̊C, -2.93% / ̊C [NTC @ 100C] × (±0.2) [Temperature Tolerance] = ± 0.586 % Resistance Tolerance.
Why resistance of thermistor decreases with increase in temperature?
With NTC thermistors, resistance decreases as temperature rises; usually due to an increase in conduction electrons bumped up by thermal agitation from the valence band.