Index: firmware/App/Services/TDInterface.c
===================================================================
diff -u -rabe1c4a42afb385a660381e48bd007331f60950c -r8ef1ab55d4bfe1acd00f9c230bf134880c81e905
--- firmware/App/Services/TDInterface.c	(.../TDInterface.c)	(revision abe1c4a42afb385a660381e48bd007331f60950c)
+++ firmware/App/Services/TDInterface.c	(.../TDInterface.c)	(revision 8ef1ab55d4bfe1acd00f9c230bf134880c81e905)
@@ -59,19 +59,20 @@
 #define TD_BICARBONATE_MAX                  ( 40U )                        ///< TD Max acid type index
 
 #define BICARBONATE_CONVERSION_FACTOR       0.07337F                       ///< Bicarbonate conversion factor mS/cm per mmol/L
+#define MAX_ACID_CONC_TYPES                 10                             ///< Number of acid concentrate conversion factors
 
 // TODO move to institutional records once implemented
 /// Acid concentration conversion factors for each acid type
-const F32 ACID_CONVERSION_FACTOR[ NUM_OF_ACID_TYPE - 1 ] = { 0.11192F,
-                                                             0.11313F,
-                                                             0.11435F,
-                                                             0.0F,
-                                                             0.0F,
-                                                             0.0F,
-                                                             0.0F,
-                                                             0.0F,
-                                                             0.0F,
-                                                             0.0F };
+const F32 ACID_CONVERSION_FACTOR[ MAX_ACID_CONC_TYPES ] = { 0.11192F,
+                                                            0.11313F,
+                                                            0.11435F,
+                                                            0.0F,
+                                                            0.0F,
+                                                            0.0F,
+                                                            0.0F,
+                                                            0.0F,
+                                                            0.0F,
+                                                            0.0F };
 
 /// Enumeration of TD Treatment Overrides
 typedef enum TD_Treatment_Override