Mounting Thermopile on PCB

Thread Starter

Alr2728

Joined Aug 17, 2021
1
Hey guys,
I have a problem working with thermopile; when I connect OTP-638D2 to my PCB using wires it works Correctly, but when I mount it directly on PCB the output temperature decreases and stops at about 2 degrees lower than the objects temperature after 6 minutes, what would be the problem?
 
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