Index: firmware/App/Services/TDInterface.c
===================================================================
diff -u -r969f477ff642acbe9620311535a74872af4a28cd -r2ae6daaf7d4cf33e3e9b1ade40750f3eae04c128
--- firmware/App/Services/TDInterface.c	(.../TDInterface.c)	(revision 969f477ff642acbe9620311535a74872af4a28cd)
+++ firmware/App/Services/TDInterface.c	(.../TDInterface.c)	(revision 2ae6daaf7d4cf33e3e9b1ade40750f3eae04c128)
@@ -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