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Simscape model for Platinum RTD?

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Keith Barkley
Keith Barkley on 19 Aug 2020
Answered: Vasco Lenzi on 21 Aug 2020
I see two thermistor models, but no RTD models.
Accoding to Omega engineering, they follow :
"Platinum RTD resistance can be calculated using the Callendar-Van Dusen Equation"
Rt = R0 [1 + At + Bt^2 + C(t-100)t^3]
Which is nothing like the equations given for the supplied thermistor models.

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Answers (1)

Vasco Lenzi
Vasco Lenzi on 21 Aug 2020
Hi Keith
I'm afraid that there are no readily available blocks which implements Platinum RTD models.
My suggestion would be to quickly build it up for scratch using one of two workflows:
1) implementing the Callendar-Van Dusen Equation using Simscape Physical Signal library, and feed it to a variable resistor, something akin this (just a quick sketch, from a temperature sensor to a set of calculation into a variable resistor):
1) implementing it as a block using Simscape Language, starting maybe from a copy of the source code of the Variable Resistor in the Simscape Foundation Library:
Simscape Language is more powerful and elegant but maybe more difficult with 0 experience. Take a look at this example in the documentation if needed!
Getting Started:
Step-by-step of modeling a linear resistor with Simscape Language:

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