Index: firmware/App/Controllers/AirTrap.c
===================================================================
diff -u -ra2bc96881a5fc3d8f779246b2abebf15a8de9384 -r6b870cd0699bb3ee22b93981d51373a6c2d56162
--- firmware/App/Controllers/AirTrap.c	(.../AirTrap.c)	(revision a2bc96881a5fc3d8f779246b2abebf15a8de9384)
+++ firmware/App/Controllers/AirTrap.c	(.../AirTrap.c)	(revision 6b870cd0699bb3ee22b93981d51373a6c2d56162)
@@ -31,11 +31,14 @@
  */
 
 // ********** private definitions **********
+
+/// Interval (ms/task time) at which the air trap data is published on the CAN bus.
+#define AIR_TRAP_DATA_PUB_INTERVAL          ( MS_PER_SECOND / TASK_PRIORITY_INTERVAL )
+/// Persistence period for illegal level sensors fault.
+static const U32 AIR_TRAP_ILLEGAL_LEVELS_PERSISTENCE = ( MS_PER_SECOND * 2 / TASK_PRIORITY_INTERVAL );
+/// Volume (in mL) of venous portion of blood circuit line.  TODO - get actual volume from Systems.
+#define VENOUS_LINE_VOLUME_ML               ( 200.0 )
 
-#define AIR_TRAP_DATA_PUB_INTERVAL          ( MS_PER_SECOND / TASK_PRIORITY_INTERVAL )      ///< Interval (ms/task time) at which the air trap data is published on the CAN bus.
-#define AIR_TRAP_ILLEGAL_LEVELS_PERSISTENCE ( MS_PER_SECOND * 2 / TASK_PRIORITY_INTERVAL )  ///< Persistence period for illegal level sensors fault.
-#define VENOUS_LINE_VOLUME_ML               ( 200.0 )                                       ///< TODO Volume (in mL) of venous portion of blood circuit line.
-
 /// Defined states for the air trap controller state machine.
 typedef enum AirTrap_States
 {