Index: firmware/App/Drivers/TemperatureSensors.c
===================================================================
diff -u -re7fe0454b5b2d39009dc784dc8c156856df8bc86 -rc408c29123e153d5a004b5b58bd455d01824f7f1
--- firmware/App/Drivers/TemperatureSensors.c	(.../TemperatureSensors.c)	(revision e7fe0454b5b2d39009dc784dc8c156856df8bc86)
+++ firmware/App/Drivers/TemperatureSensors.c	(.../TemperatureSensors.c)	(revision c408c29123e153d5a004b5b58bd455d01824f7f1)
@@ -34,11 +34,16 @@
 
 // ********** private definitions **********
 
+#define USE_PT_100                                              1                                               ///< flag to check PT100 use in calculations
+
 #define PRIMARY_HEATER_TEMP_SENSORS_GAIN                        8U                                              ///< Primary heater temperature sensors gain.
 #define PRIMARY_HEATER_TEMP_SENSORS_REF_RESISTANCE              20000                                           ///< Primary heater temperature sensors reference resistance.
 #define PRIMARY_HEATER_TEMP_SENSORS_0_DEGREE_RESISTANCE         1000U                                           ///< Primary heater temperature sensors zero degree resistance.
-#define PRIMARY_HEATER_TEMP_SENSORS_V3_REF_RESISTANCE           19600                                           ///< Primary heater temperature sensors V3 reference resistance.
 
+#define PT100_TEMP_SENSORS_GAIN                                 8U                                             ///< PT100 temperature sensors gain.
+#define PT100_TEMP_SENSORS_REF_RESISTANCE                       4700                                            ///< PT100 temperature sensors reference resistance.
+#define PT100_TEMP_SENSORS_0_DEGREE_RESISTANCE                  100U                                            ///< PT100 temperature sensors zero degree resistance.
+
 #define TEMP_SENSORS_ADC_BITS                                   24U                                             ///< External temperature sensors ADC bits.
 #define MAX_NUM_OF_RAW_ADC_SAMPLES                              4U                                              ///< Number of ADC reads for moving average calculations.
 #define SHIFT_BITS_BY_2                                         2U                                              ///< Shift bits by 2 to create a 4 for averaging 4 samples.
@@ -149,7 +154,29 @@
     memset( &baroConvConsts, 0x0, sizeof( BARO_SENSOR_CONSTS_T ) );
 
     // Initialize TH1 (primary heater), TH2(outlet Heat Exchanger), TAUX ( Inlet Heat exchanger),
-    // TH3 ( Trim Heater) constants. For now, assume same gain across all sensors.
+    // TH3 ( Trim Heater) constants.
+    // Based on the PT100/PT1000,define the constants for all temperature sensors
+#ifdef USE_PT_100
+    tempSensors[ TEMPSENSORS_INLET_HEAT_EXCHANGER ].gain                        = PT100_TEMP_SENSORS_GAIN;
+    tempSensors[ TEMPSENSORS_INLET_HEAT_EXCHANGER ].refResistance               = PT100_TEMP_SENSORS_REF_RESISTANCE;
+    tempSensors[ TEMPSENSORS_INLET_HEAT_EXCHANGER ].zeroDegreeResistance        = PT100_TEMP_SENSORS_0_DEGREE_RESISTANCE;
+    tempSensors[ TEMPSENSORS_INLET_HEAT_EXCHANGER ].maxAllowedTemp              = TEMP_SENSORS_MAX_ALLOWED_DEGREE_C;
+
+    tempSensors[ TEMPSENSORS_OUTLET_HEAT_EXCHANGER ].gain                       = PT100_TEMP_SENSORS_GAIN;
+    tempSensors[ TEMPSENSORS_OUTLET_HEAT_EXCHANGER ].refResistance              = PT100_TEMP_SENSORS_REF_RESISTANCE;
+    tempSensors[ TEMPSENSORS_OUTLET_HEAT_EXCHANGER ].zeroDegreeResistance       = PT100_TEMP_SENSORS_0_DEGREE_RESISTANCE;
+    tempSensors[ TEMPSENSORS_OUTLET_HEAT_EXCHANGER ].maxAllowedTemp             = TEMP_SENSORS_MAX_ALLOWED_DEGREE_C;
+
+    tempSensors[ TEMPSENSORS_HYDRAULICS_PRIMARY_HEATER ].gain                   = PT100_TEMP_SENSORS_GAIN;
+    tempSensors[ TEMPSENSORS_HYDRAULICS_PRIMARY_HEATER ].refResistance          = PT100_TEMP_SENSORS_REF_RESISTANCE;
+    tempSensors[ TEMPSENSORS_HYDRAULICS_PRIMARY_HEATER ].zeroDegreeResistance   = PT100_TEMP_SENSORS_0_DEGREE_RESISTANCE;
+    tempSensors[ TEMPSENSORS_HYDRAULICS_PRIMARY_HEATER ].maxAllowedTemp         = HEATERS_INTERNAL_TEMP_SENSORS_MAX_ALLOWED_DEGREE_C;
+
+    tempSensors[ TEMPSENSORS_TRIMMER_HEATER ].gain                              = PT100_TEMP_SENSORS_GAIN;
+    tempSensors[ TEMPSENSORS_TRIMMER_HEATER ].refResistance                     = PT100_TEMP_SENSORS_REF_RESISTANCE;
+    tempSensors[ TEMPSENSORS_TRIMMER_HEATER ].zeroDegreeResistance              = PT100_TEMP_SENSORS_0_DEGREE_RESISTANCE;
+    tempSensors[ TEMPSENSORS_TRIMMER_HEATER ].maxAllowedTemp                    = TEMP_SENSORS_MAX_ALLOWED_DEGREE_C;
+#else
     tempSensors[ TEMPSENSORS_INLET_HEAT_EXCHANGER ].gain                        = PRIMARY_HEATER_TEMP_SENSORS_GAIN;
     tempSensors[ TEMPSENSORS_INLET_HEAT_EXCHANGER ].refResistance               = PRIMARY_HEATER_TEMP_SENSORS_REF_RESISTANCE;
     tempSensors[ TEMPSENSORS_INLET_HEAT_EXCHANGER ].zeroDegreeResistance        = PRIMARY_HEATER_TEMP_SENSORS_0_DEGREE_RESISTANCE;
@@ -169,7 +196,9 @@
     tempSensors[ TEMPSENSORS_TRIMMER_HEATER ].refResistance                     = PRIMARY_HEATER_TEMP_SENSORS_REF_RESISTANCE;
     tempSensors[ TEMPSENSORS_TRIMMER_HEATER ].zeroDegreeResistance              = PRIMARY_HEATER_TEMP_SENSORS_0_DEGREE_RESISTANCE;
     tempSensors[ TEMPSENSORS_TRIMMER_HEATER ].maxAllowedTemp                    = TEMP_SENSORS_MAX_ALLOWED_DEGREE_C;
+#endif
 
+
     // Board temperature sensors conversion coefficient
     tempSensors[ TEMPSENSORS_BOARD_TEMPERATURE ].conversionCoeff                = conversionCoeff;
     tempSensors[ TEMPSENSORS_BOARD_TEMPERATURE ].maxAllowedTemp                 = NON_FLUID_PATH_TEMP_SENSORS_MAX_ALLOWED_DEGREE_C;