You can check which is which by observing the meter in the day and in the night to see which is Recording.
So it seems r2 is your day rate. Did you check that r1 is running after midnight? I agree with DaveD that r1 is normally your day rate, but setups can vary.
Hi, sorry for the late reply. It appears that AMPY are now Landis + Gyr. The strange thing is that all the references to your meter model show it as being a single rate meter. Now AMPY when they were going may have modified the Landis + Gyr machine but who knows. I think I would be very tempted to get it checked but as is the way of things nowadays they will probably charge you for the privilege. Best I can come up with for the moment I'm afraid.
DaveD