Resistance Temperature Detectors Question

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Discussion Overview

The discussion revolves around calculating the resistance of a Resistance Temperature Detector (RTD) at a specific temperature, as well as a related problem involving a strain gauge. Participants explore the equations and values needed for these calculations, including the temperature coefficient and nominal resistance.

Discussion Character

  • Homework-related

Main Points Raised

  • One participant presents a problem involving an RTD with a specified temperature coefficient and resistance at 20°C, seeking to find the resistance at 25°C using the formula R=R₀(1 + α(T-T₀)).
  • Another participant questions the values of R₀ and T₀, indicating a need for clarification on these parameters.
  • A different participant reports successfully solving the RTD problem after reconsideration and expresses a desire for assistance with a new problem regarding a strain gauge.
  • There is a request for the relevant equation to solve the strain gauge problem, suggesting that once the equation is identified, the calculation would be straightforward.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the values for R₀ and T₀, and the discussion on the strain gauge problem remains unresolved.

Contextual Notes

There are missing assumptions regarding the definitions of R₀ and T₀, and the specific equation for the strain gauge calculation has not been established in the discussion.

pcdoctor
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Homework Statement


An RTD has a (weird looking a) (20'c) = 0.004'C-1.
If R = 106 Ohms at 20'c find the resistance at 25'c


Homework Equations



R=Ro(1 + (weird looking a)(T-To))

Answer should come to 108.12 Ohms



The Attempt at a Solution



20 / 106 = 0.1886 * 25 X
 
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What do you think [itex]R_0[/itex] and [itex]T_0[/itex] equal?
 
I managed to do it in the end

Hi,

I had another go at it and i got the correct answer :smile:

Sometimes you have to look at things twice.

I cannot do this one:

A strain gauge has GF = 2.14 and a nominal resistance of 120 Ohms. Calculate the resistance change resulting from a strain of 144 um/m.
Any help would be great.
 
pcdoctor said:
Hi,

I had another go at it and i got the correct answer :smile:

Sometimes you have to look at things twice.

Great!

I cannot do this one:

A strain gauge has GF = 2.14 and a nominal resistance of 120 Ohms. Calculate the resistance change resulting from a strain of 144 um/m.
Any help would be great.

What is the relevant equation? Once you have this, I think it's just a matter of plugging in the numbers.
 

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