diff --git a/TestBenchFramework/BenchControl/Sequences/SequenceBase.cs b/TestBenchFramework/BenchControl/Sequences/SequenceBase.cs
index c377bf737..eafe05b5b 100644
--- a/TestBenchFramework/BenchControl/Sequences/SequenceBase.cs
+++ b/TestBenchFramework/BenchControl/Sequences/SequenceBase.cs
@@ -277,7 +277,7 @@ namespace TBF.BenchControl.Sequences
 				}
 				while (!e.Contains(Event.BalanceDone));
 			}
-			while (mass.Val > (Balance.Capacity / 100.0f + 20.0f));
+			while (mass.Val > (Balance.Capacity / 40.0f + 20.0f));
 
         quit_emptying:
 			//--------------------------------
diff --git a/TestBenchFramework/BenchControl/StateMachine.cs b/TestBenchFramework/BenchControl/StateMachine.cs
index ea5cdd1dd..42ef6cd27 100644
--- a/TestBenchFramework/BenchControl/StateMachine.cs
+++ b/TestBenchFramework/BenchControl/StateMachine.cs
@@ -475,12 +475,15 @@ namespace TBF.BenchControl
 
 			try
 			{
-                Sequences.SequenceBase.ReferenceFlowmetersCount = SequenceBase.FlowMeters.Count;
-                Sequences.SequenceBase.LtrPerRefPulse = new float[Sequences.SequenceBase.ReferenceFlowmetersCount];
+                SequenceBase.ReferenceFlowmetersCount = SequenceBase.FlowMeters.Count;
+                SequenceBase.LtrPerRefPulse = new float[SequenceBase.ReferenceFlowmetersCount];
                 foreach (var flowmtr in SequenceBase.FlowMeters)
                 {
                     int ix = flowmtr.Position;
-                    SequenceBase.LtrPerRefPulse[ix - 1] = flowmtr.NominalFlow / 7200.0f;
+                    if (ix > 0 && ix <= SequenceBase.ReferenceFlowmetersCount)
+                    {
+                        SequenceBase.LtrPerRefPulse[ix - 1] = flowmtr.NominalFlow / 7200.0f;
+                    }
                 }
 
 				(new Sequences.MainSeq()).Execute(null);