11/09/17 Thermistor is an electronic component used to calculate the temperature.This is a type of resistor whose resistance varies with change in temperature. 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. The word “thermistor” is actually a contraction of the words “thermal resistor”. What is the Steinhart-Hart Equation? method. The Thermistor is a solid state temperature sensing device which acts a bit like an electrical resistor but is temperature sensitive. It can be an accurate method to derive temperature from a known resistance. Thermistors can be used to produce an analogue output voltage with variations in ambient temperature and as such can be referred to as a transducer. Other Thermistors are available. The temperature is obtained in Equation method by directly using the Steinhart-Hart Equation shown below: 3 Thermistor Thermistor K A B ln(R ) C (ln(R)) T 1 Where A, B and C are Steinhart-Hart coefficients that are calculated by the component. Both types of thermistors These NTC thermistors are made up from the combination of metal oxides which passed through sintering process which gives negative electrical resistance versus temperature (R/T) relationship to it. The most commonly used form is the SteinhartHart Equation shown below: 1 T A B ln Rt () ClnRt ()()3 Where Rt ‐‐‐ the thermistor resistance ( ) at temperature T (Kelvin); A, B, C ‐‐‐ the thermistor’s constants. 10K-2[XP] and 10K-3[XP] thermistors are typically stocked items * All Passive Thermistors 10K Ω and smaller are CE compliant. If you have a 10K thermistor + 10K resistor connected between 5V and ground, you'll get about 5V / (10K + 10K) = 0.25mA flowing at all times. The equations used in the Steinhart-Hart method need three resistance values from the thermistor’s LUT to calculate the estimated curve fit: R1 = resistance at the lowest temperature (T1 = -40°C). While this isn't a lot of current, it will heat up your thermistor as the 10K thermistor will be dissipating about 0.25mA * 2.5V = 0.625 mW. The coefficients are obtained by solving three simultaneous equations formed by substituting the Code for … * Rev. The equation for a voltage divider is: In terms of the voltage divider in a thermistor circuit, the variables in the equation above are: ... For example, if your thermistor resistance is 34,000 Ohms, it is a 10K thermistor. If it’s 340,000 Ohms, it’s a 100K thermsitor. This is a general curve fitting equation to accommodate all NTC type resistors. Note that the equation needs the constants A, B, and C. These are different for each thermistor and need to be either given or calculated. The Steinhart-Hart equation is a 3rd order polynomial using natural logs. But before we implement the above equation, let us first wire the Arduino and thermistor in the voltage divider scenario: Contact BAPI for availability and specifications of additional thermistors. Minimum quantities and long lead times may apply. Lastly, we can input V 2 into the equation as a variable which is read from one of the analog pins. We use a, b, c from our fit above for the thermistor data table. The most accurate model used to convert thermistor resistance to temperature is called the Steinhart-Hart equation. We also selected R 1 based on our desired temperature range, and V 0 is set using the Arduino. The approximation of the relationship of temperature and resistance is “good enough” for most applications. 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