Index: firmware/App/Controllers/ConductivitySensors.c
===================================================================
diff -u -r3414e47b2664c56ab6b2f0cd5cd6b30ae9a5e333 -r73f039b34276c425ff0f7227f3c5a7733ca0deef
--- firmware/App/Controllers/ConductivitySensors.c	(.../ConductivitySensors.c)	(revision 3414e47b2664c56ab6b2f0cd5cd6b30ae9a5e333)
+++ firmware/App/Controllers/ConductivitySensors.c	(.../ConductivitySensors.c)	(revision 73f039b34276c425ff0f7227f3c5a7733ca0deef)
@@ -308,10 +308,10 @@
  *************************************************************************/
 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;
 }
 
 /*********************************************************************//**