Index: firmware/App/Controllers/PresOccl.c
===================================================================
diff -u -raa3d4f93029367d911d15cd0fbcd265a1522cc74 -r7e8e3d1fb7a6a01ff42d21e52d9cfb765044bc19
--- firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision aa3d4f93029367d911d15cd0fbcd265a1522cc74)
+++ firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 7e8e3d1fb7a6a01ff42d21e52d9cfb765044bc19)
@@ -852,8 +852,10 @@
         if ( pressureLimitsActive != FALSE )
         {
             BOOL venPresLow, venPresHigh;
-            // compute fixed exemption period (in general task intervals) for low venous pressure alarms after air trap fills
-            U32  exemptPeriod = VENOUS_PRES_AT_FILL_DELAY_FACTOR / MAX_SET_BLOOD_FLOW_RATE ;
+            S32  qB           = abs( getTargetBloodFlowRate() );
+            U32  qBx          = ( 0 == qB ? MIN_SET_BLOOD_FLOW_RATE : (U32)qB );
+            // compute exemption period (in general task intervals) for low venous pressure alarms after air trap fills
+            U32  exemptPeriod = VENOUS_PRES_AT_FILL_DELAY_FACTOR / qBx;
             // minimumMonitoring Window helps to check and raise low venous pressure alarm on a case where repeated fill events occurrence.
             U32  minimumMonitoringWindow = exemptPeriod + LOW_VENOUS_PRES_MONITOR_WINDOW ;