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: 0C = 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:

 

C = K 273.15

 

F = C * 1.8 + 32


 

Schematic:  

 

 

Description and SKU#

Price

Picture

Thermistor interface Kit

EID-K-THR-INTF-10K-ASM Fully assembled

EID-K-THR-INTF-10K-PCB-KIT Kit

 

69.95

39.95

 

 

SENSER-TM10 General purpose SS sensor with 10K thermistor

EID-T-0TM-A010

 

 

39.70

 

EID-K-THR-INTF-XXK-PCB PCB Only 12.99