Electronic Kits

Thermistor interface kit

This kit allows you to power and measure NTC termistor resistance as function of temperature, utilizing the Steinhart-Hart thermistor equation. The kit designed to perform accurate thermistor temperature readings.

Kit Includes

7809 Voltage Regulator 1pc.
0.1MF Capacitor 1pc.
47MF Capacitor 1pc.
100MF Capacitor 1pc.
100 Ohms Resistor 2pc.
2.2K Ohms Resistor 2pc.
4.3K Ohms Resistor 2pc.
10K Ohms 1/% Resistor 2pc.
2K Ohms Tirmmer 2pc.
2.2K Ohms Resistor 2pc.
Red LED 1pc.
1N4001 Diode 4pc.
LM358-2.5 Zener Diode 1pc.
10K @25C Thermistor 1pc.
2P Terminal Block Connector 3pc.
PCB 1pc.

Temperature Probes

For our big selection of temperature probe click hear

We can custom the probe to fit your needs. Choose from SS, glass or plastic temperature electrodes (probes).

SENSER - SS Temperature Sensor (TM10) With 10K Thermistor

Calculating the thermistor temperature

The thermistor resistance (R) should be obtained from the following formula:

Where V_out is the output voltage of the board;

R = 10K * { (2V / Vout) -1}

After finding the resistance (R) of the thermistor, all that's left to do is to plug it into the Steinhart-Hart thermistor equation (see below) and get the current temperature.

The Steinhart-Hart thermistor equation is derived from mathematical curve-fitting techniques and examination of the resistance versus temperature characteristics of thermistor devices.

Where T is the temperature in Kelvin (note: 0°C = 273.15K), and A, B, and C are constant factors for the thermistor that is being molded.

Steinhart-Hart Equation:

T = 1 / {A + B[ln(R)] + C[ln(R)]^3}

A = 0.001129148

B = 0.000234125

C = 8.76741E-08

Please be advised, the coefficients A, B, and C are constant factors of the individual thermistor. The above coefficients are given for 10K @ 25C thermistor from Betatherm , Inc. MA, USA.

Finally, to convert the result from Kelvin to degree Centigrade or Fahrenheit use the following formulas: