diff --git a/RTD_8chanels_board.cs b/RTD_8chanels_board.cs
index c12a902..cd904f3 100644
--- a/RTD_8chanels_board.cs
+++ b/RTD_8chanels_board.cs
@@ -41,6 +41,11 @@ namespace Libs_SequentMicrosystems
                 throw new IOException($"Fail to communicate with the RTD card with message: \"{e.Message}\"");
             }
 
+            if (val < 0)
+            {
+                val = 0;
+            }
+
             return val;
         }