**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:

**Â Â RT = Rref[1 + Î±(T âˆ’ Tref)]**

Where,

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

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

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

**Example:**

The following example shows how to use this formula to calculate the resistance of a PT100Â 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 â„¦[1 + (0.00392)(35 âˆ’ 0)]

RT = 100 â„¦[1 + 0.1372]

RT = 100 â„¦[1.1372]

RT = 113.72 â„¦

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.

## 5 comments

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