BASO K15DA-18 Thermocouple

When you are out in the field and a standing pilot ignition system won't hold the flame, you need a drop-in replacement that matches manufacturer specs exactly. The BASO K15DA-18 Thermocouple is the current standard for high-performance thermoelectric monitoring. This 18-inch lead is engineered for a 20-28 mV open circuit range, providing the consistent millivoltage required to keep your gas valve's electromagnet engaged. Whether you are servicing a furnace, commercial water heater, or catalytic heater, this unit delivers the thermal response time you need to ensure safe and reliable operation.

The BASO K15DA-18 is the direct updated version for the K15DS-18 and K15DA-18H models. It features a robust 11/32-32 male nut connector for a secure, gas-tight fit to the pilot safety unit. Designed to handle maximum hot junction temperatures up to 1500°F (816°C), this commercial-grade thermocouple prevents the common nuisance shutdowns caused by metal fatigue or inconsistent signals in high-heat environments. For technicians upgrading older Johnson Controls or BASO brand automatic pilot controls, this part ensures compatibility without the need for additional adapters.

Key Benefits:

• Broad Compatibility: Replaces legacy K15DS-18 and K15DA-18H series commonly found in HVAC and industrial gas appliances.
• Precision Voltage: Optimized for an open circuit mV range of 20 to 28 mV to minimize voltage drop issues across the lead.
• High Heat Resilience: Built to withstand 1500°F at the hot junction, reducing oxidation and extending the life of the sensor probe.
• Universal Threading: Utilizes standard 11/32-32 threading for seamless integration with most standing pilot burner assemblies.
• Professional Reach: The 18-inch copper lead provides sufficient flexibility for routing away from the main burner path to prevent premature wear.

Common Questions:

• Will this work if my pilot stays lit but the main burner won't fire? If the pilot stays lit, the thermocouple is likely generating enough millivolts to hold the safety valve; the issue may be the gas valve itself or the thermostat circuit. Always check the open circuit voltage with a multimeter to be sure.
• Can I use this to replace a snap-in style thermocouple? No, the K15DA-18 is a threaded unit. If your assembly requires a snap-in connection, you would typically look at the K15FA series.
• Is the 18-inch length interchangeable with shorter leads? You can use a longer lead as long as it is routed safely, but going too short will prevent proper connection. Ensure the lead is not kinked or placed directly in the main burner flame.

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.