BASO K19AT-18 Thermocouple

The BASO K19AT-18 is a professional-grade Super Slim Jim universal replacement thermocouple designed for high-reliability performance in standing pilot ignition systems. This 18-inch lead features a specialized slim-diameter tip, engineered specifically to fit into tight pilot burners where standard thermocouples often fail to seat correctly. Operating within an open circuit millivolt range of 25-35 mV, it ensures consistent voltage to the safety magnet, preventing nuisance drop-outs in residential and commercial heating equipment. The inclusion of a robust spring clip allows for rapid, secure installation across a variety of burner configurations. Technicians should note that the K19AT-18 is functionally identical to the K19AT-18H, offering the same electrical characteristics and physical dimensions. Utilizing a standing pilot thermocouple like this ensures a stable pilot flame sensor response, maintaining the integrity of the gas valve’s safety circuit in HVAC pilot assemblies.

Key Benefits for Contractors

• Universal Compatibility: The BASO Gas Products K19AT-18 serves as a versatile gas furnace thermocouple replacement for diverse OEM applications.
• Enhanced Clearance: The Super Slim Jim profile bypasses fitment issues in compact or restricted pilot burner housings.
• Stable Millivolt Output: Delivers a reliable 25-35 mV signal to ensure your standing pilot system stays operational under varying thermal loads.
• Durable Construction: Built to withstand high ambient temperatures at the pilot head without rapid degradation of the dissimilar metals.

Common Questions

Will this work in a water heater or just a furnace?
As long as the pilot burner accepts a Super Slim Jim style tip and requires an 18-inch lead, this unit is compatible with various gas-fired appliances using standing pilots.

What causes a thermocouple to stop holding the pilot?
Usually, it is carbon buildup or a depleted millivolt output. Testing the open circuit voltage with a multimeter should show at least 25-35 mV; anything lower indicates it is time for a replacement.

Is there a difference between the K19AT-18 and K19AT-18H?
No, these part numbers are synonymous in technical specifications and physical build, meaning they can be used interchangeably in the field.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.