haouari ibrahim

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8 years, 3 months ago.

ntcD5-9 Steinhart coefficients

Hi. I need the Steinhart coefficients (A , B and C) of ntc5D-9. Thank you for any help.

Question relating to:

Last updated: 19 Jan 2016
ADS1246/7/8 24bit ADC converter for Temperature Sensors class NTC, PT100, PT1000, PT500, RTD, Temperature, Thermocouple

2 Answers

Ian Kilburn
8 years, 3 months ago.

Hi

You can calculate the Steinhart-Hart coefficients from 3 measured data points. The equations are here in the section coefficients.

https://en.wikipedia.org/wiki/Steinhart–Hart_equation

I found a data sheet with the temperature curve for this part. You could use the centre resistance for the calculation too.

http://www.microtech-hk.com/dl.php?itemid=PR01931&id=D031033

This part has a resistance of only 5Ohm at 25°C. If you want to measure around room temperature and higher maybe a thermistor with a resistance of 10K at 25°C might be better

Robert Spilleboudt
8 years, 3 months ago.

DIY: look at http://www.thinksrs.com/downloads/PDFs/ApplicationNotes/LDC%20Note%204%20NTC%20Calculator.pdf and there is a online calculator at http://www.thinksrs.com/downloads/programs/Therm%20Calc/NTCCalibrator/NTCcalculator.htm