diff --git a/src/transformers/data_transformer.py b/src/transformers/data_transformer.py
index 3b10045..9d553e5 100644
--- a/src/transformers/data_transformer.py
+++ b/src/transformers/data_transformer.py
@@ -402,6 +402,13 @@ class DataTransformer:
                 # Store measurements with node number as key
                 consolidated_measurements[str(node_num)] = node_measurements
 
+                # Log consolidation to help debug
+                if len(group_rows) > 1:
+                    logger.debug(
+                        f"Consolidating node {node_num} for unit={key[0]}, tool={key[1]}, "
+                        f"timestamp={key[3]}: {len(node_measurements)} measurement categories"
+                    )
+
             # Use the row with minimum id as template for other fields
             min_id_row = min(group_rows, key=lambda r: r["idElabData"])
             # Use the row with maximum id for the consolidated row ID (for proper resume)