Frustrated with inconsistencies and poor documentation of the Raspberry Pi and Arduino boards. Radical decision time! Searched the internet for a better solution, industrial grade, tested and with a real manual. Found LabJack T7 with the ability to measure thermocouples directly.
The T7 family of devices has the resolution and amplification necessary to directly measure raw thermocouple signals. If you save 1 channel for an external cold junction temperature sensor a single T7 can measure up to 13 thermocouples itself .
The power-meting with an ACS712 goes also directly. In the picture below it’s hooked up to AIN0 with a reading of 2.526106 whit no current flowing and 5V power-supply.
It comes with a extensive library with functions to integrate in different programming environments like Python C++ etc.