The Industrial Raspberry Pi Forum

Hi, I have a project where I want to connect 30 thermocouples to a controller that can do scripts. RevPi seem to be a perfect controller for what I need in terms om control features. But I can't seem to find any Io for thermocouples. Anyone know if it is possible to connect thermocouples to RevPi?

Br,

Jörgen

Hi Jörgen so is it an analog measurement or interface?
I think the answer to your question is no because we have those questions again and again but take a look at the documentation and the data sheets of the AIO module and the MIO module here:
https://revolutionpi.com/documentation/revpi-aio/
https://revolutionpi.com/documentation/revpi-mio/

Hello Jörgen,

As far as I know, connecting thermocouples directly to an AIO or MIO module is not recommended as the inputs in the process image have a resolution of 1 mV which, if you are using type K thermocouples, would mean that you can measure temperature in 52 steps, which corresponds to steps of approximately 25°C. For other thermocouple types it may look even worse. What I think you could do well, however, is not to connect the thermocouples directly to an AIO or MIO card, but to connect an operational amplifier upstream that amplifies the thermoelectric voltage. This should allow you to measure the temperature with better resolution.

Kind regards,
Elias

dirk wrote: 12 Feb 2025, 11:30 Hi Jörgen so is it an analog measurement or interface?
I think the answer to your question is no because we have those questions again and again but take a look at the documentation and the data sheets of the AIO module and the MIO module here:
https://revolutionpi.com/documentation/revpi-aio/
https://revolutionpi.com/documentation/revpi-mio/

I'm thinking of an analog connection like what you would find for PLCs. Like https://www.wago.com/global/i-o-systems ... /p/750-458 for example.

Br, Jörgen