
#1
Apr412, 02:19 PM

P: 8

1. The problem statement, all variables and given/known data
Assume that the application of a temperature sensor approximates 1st order conditions. The sensor has a time constant of 5 seconds and is suddenly subjected to a temperature step of 25200°C. what temperature will be indicated 10 seconds after the process has been initiated? 2. Relevant equations ΔT(t)= ΔTo (expt/τ), where ΔT0 is the initial temperature difference, at time t= 0 ΔT is the initial temperature difference, at time t τ= time constant 3. The attempt at a solution i did not get that what does statement temperature step means. and what's ΔT(t) and what's ΔTo in this numerical 



#2
Apr412, 08:56 PM

HW Helper
PF Gold
P: 1,842

Hello queuetea,
Welcome to Physics Forums! If you want a specific example, imagine this. Suppose you have a temperature sensor that is at room temperature, 25^{o} C. Then you take that temperature sensor and drop it into a vat of boiling oil at 200^{o} C. That is what is meant by the temperature step. The temperature surrounding the sensor instantly changes from 25^{o} C to 200^{o} C. That said, the output of the sensor does not change instantly. It takes time for the internal structure of the sensor itself to change temperature, as well as any mechanisms involved in registering/displaying this change. The overall time constant, τ, is 5 seconds. ΔT(t): The sensor's true final temperature minus the sensor's reading at time t. Note that both of the above are temperature differences. Before you obtain your final answer, you will have to convert a value back to an absolute temperature. 



#3
Apr512, 08:31 AM

P: 8

we will take ΔT(t) =200C. & ΔTo=25C in this numerical??




#4
Apr512, 04:16 PM

HW Helper
PF Gold
P: 1,842

instrumentation numericalI'll give you a step forward. ΔT_{0} = 200^{o} C  25^{o} C. You can find ΔT(t) using your formula. 



#5
Apr912, 11:01 AM

P: 8

thakyou sir:)



Register to reply 
Related Discussions  
What texts should I be checking out for instrumentation?  Electrical Engineering  6  
Numerical Differentiation: Difference approximation on numerical data  Calculus & Beyond Homework  2  
numerical analysis (composite numerical integration)  Engineering, Comp Sci, & Technology Homework  9  
instrumentation system and error  Electrical Engineering  0  
Instrumentation  General Discussion  38 