Index: leahi_dialin/common/dd_defs.py
===================================================================
diff -u -r57ca71b2ff74ef3b96b29586f5aefd5abea222df -r23ad7f4e46c52fcc77452ca6cfa171305f01cfcc
--- leahi_dialin/common/dd_defs.py	(.../dd_defs.py)	(revision 57ca71b2ff74ef3b96b29586f5aefd5abea222df)
+++ leahi_dialin/common/dd_defs.py	(.../dd_defs.py)	(revision 23ad7f4e46c52fcc77452ca6cfa171305f01cfcc)
@@ -439,16 +439,16 @@
 @unique
 class DDLevelSensorNames(DialinEnum):
     D6_LEVEL                        = 0                         # floater switch low, medium and high status
-    D63_LEVEL                       = 1                         # bicarb level low or high status
-    D46_LEVEL                       = 2                         # Spent dialysate air separation chamber level low or high status
-    D98_LEVEL                       = 3                         # D98 Conductivity Level Sensor
+    D46_LEVEL                       = 1                         # Spent dialysate air separation conductivity level sensor low or high status
+    D63_LEVEL                       = 2                         # bicarb lower level conductivity level sensor low or high status
+    D98_LEVEL                       = 3                         # bicarb upper level conductivity Level sensor low or high status 
     NUM_OF_LEVELS                   = 4                         # Number of Level Sensors
 
 DDLevelSensorNames._str_list = {
     # Official Name :       Accepted strings
     'D6_LEVEL': ['d6'],
-    'D63_LEVEL': ['d63'],
     'D46_LEVEL': ['d46'],
+    'D63_LEVEL': ['d63'],
     'D98_LEVEL': ['d98'],
     'NUM_OF_LEVELS': [],
 }
Index: leahi_dialin/dd/modules/levels.py
===================================================================
diff -u -r20c821bd230fc7689a0275a2918981669ff5cc19 -r23ad7f4e46c52fcc77452ca6cfa171305f01cfcc
--- leahi_dialin/dd/modules/levels.py	(.../levels.py)	(revision 20c821bd230fc7689a0275a2918981669ff5cc19)
+++ leahi_dialin/dd/modules/levels.py	(.../levels.py)	(revision 23ad7f4e46c52fcc77452ca6cfa171305f01cfcc)
@@ -50,8 +50,8 @@
         #: The Level Sensors data in dictionary format
         self.dd_level_sensors = {
             dd_enum_repository.DDLevelSensorNames.D6_LEVEL.name: 0,
-            dd_enum_repository.DDLevelSensorNames.D63_LEVEL.name: 0,
             dd_enum_repository.DDLevelSensorNames.D46_LEVEL.name: 0,
+            dd_enum_repository.DDLevelSensorNames.D63_LEVEL.name: 0,
             dd_enum_repository.DDLevelSensorNames.D98_LEVEL.name: 0
         }
         self.dd_bicarb_level = 0                                #: The Bicarb level
@@ -67,15 +67,15 @@
         """
         sensor_list =[]
         sensor_list.append((dd_enum_repository.DDLevelSensorNames.D6_LEVEL, 'i'))
+        sensor_list.append((dd_enum_repository.DDLevelSensorNames.D46_LEVEL, 'i'))
         sensor_list.append((dd_enum_repository.DDLevelSensorNames.D63_LEVEL, 'i'))
         sensor_list.append((dd_enum_repository.DDLevelSensorNames.D98_LEVEL, 'i'))
-        sensor_list.append((dd_enum_repository.DDLevelSensorNames.D46_LEVEL, 'i'))
 
         i = 1
         for sensor in sensor_list:
             start_pos = eval(f'MsgFieldPositions.START_POS_FIELD_{i}')
             end_pos = eval(f'MsgFieldPositions.END_POS_FIELD_{i}')
-            if i == 4:
+            if i == 5:
                 self.dd_bicarb_level = struct.unpack('i', bytearray(message['message'][start_pos:end_pos]))[0]
             else:
                 self.dd_level_sensors[sensor[0].name] = struct.unpack(sensor[1], bytearray(message['message'][start_pos:end_pos]))[0]