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RTD interface circuit

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BABESH

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rtd circuit

I have Pt-100
I need circuit whose resolution is 1mv change for 0.1 Degree C change.

Presently i am working with ckt whose resolution is 0.03mV for 0.1 DegreeC,
But i don't want to operate in that region.

Any circuits of such kind?

tks
 

rtd interface

Take a look at the attached picture ..
If you need 1mV per 0.1° output change 49.99kΩ resistor to ≈250kΩ - this will set the gain to 26 - and the output of this amplifier will produce 1mV for every 0.1° ..

Regards,
IanP
 

rtd interface circuit

hello ianP
tks for ckt,
but i have a doubt about internal offset of op-amp,
will this ckt have this compensation?
any way i will try this on bread board.

Tks
--babesh :D
 
circuit rtd

Hi
I was facing the same problem few months ago.
I got a circuit which will give 20 mv for 0.1 C change. It was consisting of IA, OPmp and Active LPF.

I can't email it to u. but I could help u in imlemting your own :)

Added after 6 minutes:

IA : instrumentation amplifier
Opamp was used to adjust offset and final gain adjust.
Active LPF : was to eleminate supply noise due to Full/half wave rectifier.

Also there were current sourse that was used to fed the sensor with refrence current
 
interface circuit

Hi Babesh..
Did u get the output from above ckt????
I tried ckt on bread board as well as with simulation but it doesn`t work...

If you have any circuit for PT100 interfacing..can u post it here????

Thanks...
 
current source circuits for rtd

Hi vipul,
I did this without using current source.

My circuit is just one non-inverting configuration.
with +Ve fed with 500mV Vref, Rf=100Ohms,
R1=pT100.
It worked fine....



Thanks
Babesh.
 

interfacing to 1mv pic

Hi Babesh,

Thanks for reply...

Actually I also get output of circuit with some changes...

Thanks,
Vipul
 
rtd interface circuit

Hello,

Can you give me circuit idea that convert 0.1 centigrade to 10 mV?

Reply me Soon

Regards,

Mitul Shinde
 

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