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If you want to measure total power provided by the 3 phase 3 wire supply to all the UFH connected to a panel then use two meters as I showed in my second diagram ie: place the two meters between the main switch and the contactors. The input to one meter is L1-N and to the other L2-N.
If you want to measure the power consumed by an individual UFH zone (effectively a single phase circuit) then use my first diagram ie: place the PM between the output of the contactor and the UFH zone. The input will be one of these pairs L1-N, L2-N or L1-L2.
Be careful to use the correct terminals on the PM ie: Lin, Lout, Nin and Nout (though it is most likely Nin and Nout are the same node so it is immaterial which is in and which is out.
I cannot turn up the spec for the DM25S - do you have it?
If you wish we can arrange a zoom session if that would be easier for you.
Regards
Marconi
If you want to measure the power consumed by an individual UFH zone (effectively a single phase circuit) then use my first diagram ie: place the PM between the output of the contactor and the UFH zone. The input will be one of these pairs L1-N, L2-N or L1-L2.
Be careful to use the correct terminals on the PM ie: Lin, Lout, Nin and Nout (though it is most likely Nin and Nout are the same node so it is immaterial which is in and which is out.
I cannot turn up the spec for the DM25S - do you have it?
If you wish we can arrange a zoom session if that would be easier for you.
Regards
Marconi