Problem deal with accuracy of thermocouple


by soonsoon88
Tags: accuracy, deal, thermocouple
soonsoon88
soonsoon88 is offline
#1
Apr21-11, 07:01 PM
P: 53
How i am going to confirm or make sure the accurate of thermocouple before i use it for measurement in experiment?
Is it ok if ...
I put it in ice in order to get 0 Celsius and put in boiling water to get 100 Celsius?
In the idea case, i should get 0 and 100 Celsius from thermometer..
but what i should do if i got slightly different ?
I don't know how to present about the error if i use it for real experiment...i need help on it...please..
Phys.Org News Partner Science news on Phys.org
NASA's space station Robonaut finally getting legs
Free the seed: OSSI nurtures growing plants without patent barriers
Going nuts? Turkey looks to pistachios to heat new eco-city
Dr Lots-o'watts
Dr Lots-o'watts is offline
#2
Apr21-11, 09:50 PM
P: 675
Just go and see what you get with ice and boiling water. That is a great idea to start with.
soonsoon88
soonsoon88 is offline
#3
Apr22-11, 01:49 AM
P: 53
Quote Quote by Dr Lots-o'watts View Post
Just go and see what you get with ice and boiling water. That is a great idea to start with.
I did a try already..i got a slightly higher for ice. 1.1 Celsius..
If like this..
this mean i have to minus 1.1 Celsius for all value by using that device ?

jehake12
jehake12 is offline
#4
Apr22-11, 06:05 PM
P: 59

Problem deal with accuracy of thermocouple


If you need something more accurate than +/- 1.1 deg. C, use a thermistor or RTD. Don't use your TC's for that application. As far as results go, you should have some specs on that specific thermocouple that say what the accuracy of your measurements are. For example, +/- 1.5 deg over the range of 40 deg C - 375 deg C. Consider checking out OMEGA's website for typical errors for a thermocouple class.

If you need to present the temperature in a chart, simply plot the recorded values and add a foot note that shows the accuracy limitations. However, if you are taking the temperature measurements and using them to plot something as a function of temperature you probably need to adjust the accuracy accordingly. Google error propagation.
mender
mender is offline
#5
Apr22-11, 08:32 PM
P: 563
Quote Quote by Dr Lots-o'watts View Post
Just go and see what you get with ice and boiling water. That is a great idea to start with.
Unless you're at altitude.
Jobrag
Jobrag is offline
#6
Apr23-11, 07:59 AM
P: 459
That should be a mixture of ice and water to get 0, but make sure that you are using pure water, your other source of trouble is your cold junction reference how accurate is that?


Register to reply

Related Discussions
Deal or No Deal -- Odds of a better deal and most likely deal? Precalculus Mathematics Homework 1
Deal or No Deal Normal Distribution? Set Theory, Logic, Probability, Statistics 9
A Good Deal or No Deal Strategy Set Theory, Logic, Probability, Statistics 2
Graph with probability of getting an offer on Deal Or No Deal Set Theory, Logic, Probability, Statistics 1
Solution to the Deal or No Deal Problem (no statistical data present) Set Theory, Logic, Probability, Statistics 0