Index: firmware/App/Drivers/ConductivitySensors.h
===================================================================
diff -u -red39129abdca4ec343369d83494530b23621e052 -ra9983d3e6b07e7c927fab3d16e80b715594fe221
--- firmware/App/Drivers/ConductivitySensors.h	(.../ConductivitySensors.h)	(revision ed39129abdca4ec343369d83494530b23621e052)
+++ firmware/App/Drivers/ConductivitySensors.h	(.../ConductivitySensors.h)	(revision a9983d3e6b07e7c927fab3d16e80b715594fe221)
@@ -41,10 +41,11 @@
 typedef enum ConductivitySensors
 {
     FIRST_COND_SENSOR = 0,                          ///< First conductivity sensor
-    D17_COND = FIRST_COND_SENSOR,                   ///< Bicarb only conductivity sensor
+    D17_COND = FIRST_COND_SENSOR,                   ///< Bicarb only conductivity sensor - 1
     D27_COND,                                       ///< Acid and Bicarb mix conductivity sensor - 1
     D29_COND,                                       ///< Acid and Bicarb mix conductivity sensor - 2
     D43_COND,                                       ///< Spent dialysate conductivity sensor
+    D74_COND,                                       ///< Bicarb only conductivity sensor - 2
     NUM_OF_CONDUCTIVITY_SENSORS                     ///< Number of conductivity sensors
 } CONDUCTIVITY_SENSORS_T;