**RTD Conversion tool: R to T**

This is used to calculate temperature value of RTD sensor from known resistance.

This calculation tool used to find out the temperature value of a RTD sensor with known resistance.

### Calculate Temperature from Resistance

**Formula:**

Resistive Temperature Detectors (RTDs) relate resistance to temperature by the following formula:

** RT = Rref[1 + α(T − Tref)]**

Where,

RT = Resistance of RTD at given temperature T (ohms)

Rref = Resistance of RTD at the reference temperature Tref (ohms)

α = Temperature coefficient of resistance (ohms per ohm/degree)

**Example:**

The following example shows how to use this formula to calculate the resistance of a PT100 RTD with a temperature coefficient value of 0.00392 at a temperature of 35 degrees Celsius:

Assuming Temperature Reference = 0 Degrees

For PT100 RTD the Rref = 100

RT = 100 Ω[1 + (0.00392)(35 − 0)]

RT = 100 Ω[1 + 0.1372]

RT = 100 Ω[1.1372]

RT = 113.72 Ω

For Temperature to Resistance conversion also the same above formula applies.

The above given is a basic equation only for RTD calculation.

Note:

1.The above RTD calculation tool designed for a standard PT100 sensor.

2.If you are interested to calculate for a different RTD then change the fixed constant values as per the sensor type.

Excellent Work Dude…. Thanks for sharing

Its a great instrumentation tool.

its great bt plz send mi various formula sits in excel type file on my mail id

Dear sir,

tell me how u have calculate temperature coeff. Value of resistance.

Hello Dheeraj, For Temperature Coefficient Value – Pl Click here to Read

Pharm line is going down

145 degrees convert to resistance

great explain the RTD but send me PDF all formula

Measurement of temperature changes using electric resistance measurement,

I will use to apply to Motor winding temperature monitoring