Baso K19AT-48 Thermocouple 48 Inch

The BASO Gas Products K19AT-48 is a 48-inch long, vital safety component in your gas furnace or boiler, weighing around 0.17 pounds. Unlike electrical components, thermocouples don't rely on a specific voltage to function. Instead, they generate a small millivolt (mV) signal based on temperature variations between two dissimilar metals bonded together. Installed within the flame path of your furnace, the K19AT-48 uses these metals to produce a voltage typically in the range of 25-35 mV. This millivolt signal acts as a safety switch, communicating with the gas control valve to regulate gas flow. If the flame goes out, the thermocouple cools rapidly, causing a significant decrease in voltage (down to nearly 0 mV). This voltage drop signals the gas control valve to shut off the gas supply, preventing potential leaks and hazards.