Welcome to the temperature sensor manufacturers! About us | Contact us | Leaving a message
Service Hotline
Current position:Home > News center > Trade news >

Calculation formula of NTC temperature characteristic

Article source:admin Popularity:Published time:2017-05-17 21:57

Calculation formula of NTC temperature characteristic
NTC Temperature Characteristics Symbol:
R = Ro exp {B (I / T-I / To)}
R: resistance value at temperature T (K)
Ro: Resistance value at temperature T0 (K)
B: B value
* T (K) = t (ºC) +273.15

In fact, the B value of the NTC thermistor is not constant,Its size varies depending on the material composition,Maximum up to 5K / ° C.So in the larger temperature range should be used when the formula 1,There will be some error between the measured value.
Here, when the value of B in Equation 1 is calculated using the temperature function of Equation 2,It can reduce the error between the measured value,It can be considered approximately equal.

(Equation 2) BT = CT2 + DT + E

In the above formula, C, D, E are constants.In addition, the fluctuation of the B value due to the difference in the production conditions causes the constant E to change,But the constant C, D unchanged.Therefore, when discussing the fluctuation of the B value,Just consider the constant E.

• Calculation of constants C, D, and E The constants C, D, and E can be expressed by four (temperature, resistance) data (T0, R0). (T1, R1). (T2, R2) and (T3, R3) Calculated by formulas 3 to 6.
First, by the pattern 3 according to T0 and T1, T2, T3 resistance to find B1, B2, B3, and then into the following models.

Ntc constant

NTC resistance value calculation example:
According to NTC thermistor - temperature characteristics table,The NTC resistance at 25 ° C is 5 (kΩ),B value deviation of 50 (K) thermistor in the 10 ° C ~ 30 ° C resistance.
• Steps

(1) According to the resistance - temperature characteristics table, find the constant C, D, E.
To = 25 + 273.15 T1 = 10 + 273.15 T2 = 20 + 273.15 T3 = 30 + 273.15
(2) into BT = CT2 + DT + E + 50, seeking BT.
(3) substituting a value R = 5exp {(BTI / T-I / 298.15)}, seeking R.
* T: 10 + 273.15 ~ 30 + 273.15

• NTC resistance-temperature characteristics shown in Figure 1

Ntc resistance

Keywords:NTC temperature characteristic

Linde Parts industry sourcing Treatment of kidney failure autoclave unlocked mobile phone air slide fabric Hydraulic Bottle Jack POF Manufacturer Tube Settler Supplier pe film washing line Cosmetic Glass Jar hydrogen water machine concrete batching plant Electronic Control Skylights Double Wire Notebook air cool fan