York S1-025-30802-000 Flame Sensor

The York S1-025-30802-000 is a flame sensor used in HVAC equipment, specifically gas-fired furnaces and boilers. Made from durable ceramic to withstand high temperatures (between -40°C and 85°C), it ensures safe and efficient operation. This sensor works by detecting changes in electrical resistance (3-20 Ohms) when exposed to flame. It operates on a low voltage range (5-10V) and transmits an output signal between 0-5V depending on the flame strength. By continuously monitoring the flame, the sensor helps prevent gas leaks and ensures proper combustion. This ultimately improves safety, system performance, and potentially even fuel efficiency.