Max31855 breakout Board
Moderators: adafruit_support_bill, adafruit

Max31855 breakout Board

by geoff_c on Tue Feb 12, 2013 2:00 pm

Looking at the Max31855 Breakout Board I see you attach the thermocouple wire to a terminal block. Is that a special thermocouple terminal block or just a normal one. In the old days we used to have to themocouple to copper wire transistion in a ice bath at 0 degrees C as the thermocouple tables were referenced to 0 deg C. I relize that what is done now is compensation with a internal sensor but most terminal blocks are nickel plated and not copper, just wondering if that makes any difference
geoff_c
 
Posts: 2
Joined: Tue Feb 12, 2013 1:27 pm

Re: Max31855 breakout Board

by adafruit_support_bill on Tue Feb 12, 2013 2:14 pm

Since the thermocouple voltage is a function of the temperature gradient over the length of the probe, what is important for accurate measurement is that the 'cold-junction' compensation sensor in the chip is at the same temperature as the terminal block.
User avatar
adafruit_support_bill
 
Posts: 30721
Joined: Sat Feb 07, 2009 10:11 am

Re: Max31855 breakout Board

by geoff_c on Tue Feb 12, 2013 9:43 pm

Okay, thanks for the info
geoff_c
 
Posts: 2
Joined: Tue Feb 12, 2013 1:27 pm