Index: firmware/App/Modes/Prime.c
===================================================================
diff -u -re54806da466a8c52e19fd272356dbbfde04171fd -r9d083454c3e951c3b598ceb9dd60cd7e62ad4999
--- firmware/App/Modes/Prime.c	(.../Prime.c)	(revision e54806da466a8c52e19fd272356dbbfde04171fd)
+++ firmware/App/Modes/Prime.c	(.../Prime.c)	(revision 9d083454c3e951c3b598ceb9dd60cd7e62ad4999)
@@ -7,8 +7,8 @@
 *
 * @file    Prime.c
 *
-* @author  (last)      Michael Garthwaite
-* @date    (last)      21-Apr-2022
+* @author  (last)      Bill Bracken
+* @date    (last)      24-Aug-2022
 *
 * @author  (original)  Quang Nguyen
 * @date    (original)  08-Dec-2020
@@ -51,6 +51,7 @@
 #define DIALYZER_VOLUME_SCALE_FACTOR                        0.5F                                               ///< Half of the dialyzer total volume.
 
 #define NO_AIR_DETECTED_COUNT                               ( 20 * MS_PER_SECOND )                             ///< No air detected time period count.
+#define PURGE_AIR_TIME_OUT_COUNT                            ( 120 * MS_PER_SECOND )                             ///< Time period count for purge air time out.
 #define PURGE_AIR_TIME_OUT_COUNT                            ( 60 * MS_PER_SECOND )                             ///< Time period count for purge air time out.
 #define PRIME_SALINE_DIALYZER_TIME_OUT_COUNT                ( 60 * MS_PER_SECOND )                             ///< Time period count for prime saline dialyzer time out.
 #define LOAD_CELL_STEADY_VOLUME_SAMPLING_TIME               (  1 * MS_PER_SECOND )                             ///< Time load cell reading steady state detection sampling time in seconds.