Index: firmware/App/Controllers/ConductivitySensors.c
===================================================================
diff -u -r867521a9810f2218c34d96164fab614494a63f8d -r16341579abe0211c95cb541e40143f0e4670a8cd
--- firmware/App/Controllers/ConductivitySensors.c	(.../ConductivitySensors.c)	(revision 867521a9810f2218c34d96164fab614494a63f8d)
+++ firmware/App/Controllers/ConductivitySensors.c	(.../ConductivitySensors.c)	(revision 16341579abe0211c95cb541e40143f0e4670a8cd)
@@ -301,10 +301,10 @@
  *************************************************************************/
 static F32 calcCompensatedConductivity( F32 conductivity, F32 temperature )
 {
-    // EC = EC_25 * (1 + temp_coef * ( 25 - temperature ))
-    F32 const compensatedCoef  = ( 1.0 + ( COND_SENSOR_TEMPERATURE_COEF * ( COND_SENSOR_REFERENCE_TEMPERATURE - temperature ) ) );
+    // EC = EC_25 * (1 + temp_coef * ( temperature - 25 ))
+    F32 const compensatedCoef  = ( 1.0 + ( COND_SENSOR_TEMPERATURE_COEF * ( temperature - COND_SENSOR_REFERENCE_TEMPERATURE ) ) );
 
-    return conductivity * compensatedCoef;
+    return conductivity / compensatedCoef;
 }
 
 /*********************************************************************//**