If the heat flow from the inside of a wall to the outside of a wall is being measured on the outside, should the blue face or the red face of the HFP01-L touch the wall?

It depends on the sign convention used to describe heat flux through the wall. Heat flux that enters the red face and exits the blue face of the HFP01-L results in a positive analog output or positive heat. If the plate is already installed and it is desirable to use the opposite sign convention, change the sign of the multiplier to make it a negative value.

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