Definition of Furnace Thermocouple
A furnace thermocouple is used in order to monitor the furnace speed or temperature that has to be maintained within the comfort of the home. The basic function of the thermocouple is to provide a signal whenever it detects any temperature variations. This allows the system to measure the changes in air temperature as they happen in order to continue working.
Since this is a very important component, it is essential to note that not all furnaces are equipped with this type of thermocouple, which means that there may be some differences in the way the temperature is measured when it reaches the maximum operating temperature and when it reaches the desired one. The basic idea behind the difference is the fact that the temperature sensed at the maximum level has a greater effect on the thermostat as compared to that at the desired setting. Since the temperature at the desired setting will be determined by the thermostat, the initial temperature will be the most affected by the temperature sensed by the thermocouple. Hence, the temperature sensed at the maximum setting will tend to be higher than the one sensed at the desired setting.
There are certain furnaces that have the ability to sense temperature variations by themselves. In other cases, the temperature sensing requires the presence of the furnace thermocouple. The furnace thermocouple is connected to the device through the coupling cap. The temperature sensing device is set to provide a reading that is proportional to the difference between the maximum setting and the desired one. This way, the furnace thermocouple is able to determine whether the temperature is too high or too low. If it senses that it is still within the range allowed by the thermostat, it means that it is safe for the furnace to continue operating in that state. In such a case, the temperature sensor will continue to provide the reading needed by the furnace.