Lochinvar & A.O. Smith 100233518 Sensor

The Lochinvar & A.O. Smith 100233518 Sensor is a critical precision-engineered component for hydronic monitoring, specifically designed as an Inlet/Outlet Bypass Sensor. Functioning as a direct replacement for the Lochinvar TST2409, this 1/2" NPT temperature sensor provides real-time thermal data to the control board, ensuring the system maintains a precise differential between the supply and return lines. In high-efficiency condensing boilers and commercial water heaters, this replacement water heater sensor plays a vital role in modulating flow through the bypass, preventing short-cycling and protecting the heat exchanger from thermal shock or overheating. Constructed with high-sensitivity thermistor technology, the 100233518 ensures your boiler temperature control remains accurate within strict tolerances. For technicians servicing Lochinvar Knight or A.O. Smith Armor series units, this OEM sensor is the industry standard for restoring system modulation and maximizing energy efficiency across both residential and commercial hydronic applications.

• Precise Thermal Monitoring: High-sensitivity thermistor provides accurate inlet and outlet temperature readings to optimize system modulation.
• Direct OEM Compatibility: Identical to Lochinvar TST2409, ensuring a perfect physical and electrical fit for specified models.
• System Protection: Critical for managing bypass flow, which prevents heat exchanger overheating and extends the life of the primary heating equipment.
• Durable NPT Threading: Features a 1/2" NPT brass or stainless housing designed to withstand the high-pressure and high-temperature environments of commercial hydronics.

Is the 100233518 compatible with my existing TST2409 sensor?
Yes, the 100233518 is the current manufacturer part number and is identical to TST2409. They are interchangeable in all Lochinvar and A.O. Smith applications requiring this specific bypass sensor.

What are the symptoms of a failing inlet/outlet bypass sensor?
Technicians often encounter error codes related to "Sensor Out of Range" or "Temperature Differential Too High." If the sensor provides inaccurate data, the boiler may fail to modulate correctly or could lock out to prevent overheating.

Can this sensor be used for both residential and commercial units?
Yes, this sensor is utilized across various platforms, including the Lochinvar Knight, Armor, and Copper-Fin II series, provided the technical specifications match the 1/2" NPT requirement.

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.