PID Controller build

[Vossy1]

just another silly one then, a pt100 temp probe reads to 400C, for my chicken incubator 50C is boiled egg time so does anyone know of a more sensitive probe but with a shorter range, i was looking at some where between 20C and 50C with 36C being the perfect temp

PT100 work on a linear basis (so I was told long ago when asking lots of PT questions :grin: ) so they should be as accurate at 1deg as they are at 100deg c. Most PT100's for our use are class B and are accurate to 0.3deg c ish, I use class A which are accurate to 0.15deg c ish, A do cost more. So to sum up, even though they have a large range they are very accurate, the chances are the controller will be less accurate so I'd be looking there first.

 

[hedgerow pete]

righty ho, i am looking at the wrong end then

not the first time thats happend :rofl: :rofl: :rofl:

whats wrong with the one this thread started with, from fleabay

 

[Vossy1]

whats wrong with the one this thread started with, from fleabay

I can't see anything 'wrong' with it :wha: ice bath calibration for our limited temperature range use will let you know how repeatable the results are, and how accurate the probe/unit is.

 

[Darcey]

I am just looking over my PID again. Do you know why the picture are not working? I am trying to reasure myself that the wiring is correct on my PID as i have seen 2 ways of wiring.

thanks
D