Johnson Controls WEL11A-601R Well

The Johnson Controls WEL11A-601R is a heavy-duty copper bulb well designed for demanding fluid immersion applications. Engineered for use with remote bulb temperature controls and the A99 series sensors, this 1/2" NPT well ensures accurate thermal transfer while protecting sensing elements from corrosive or high-pressure environments. Featuring a 2-3/8" insertion length and a .299" inside diameter, it provides a precise fit for standard HVACR probes, preventing the "air gap" lag that often plagues external strap-on mounts. The assembly includes a durable brass connector and a phenolic bushing with a specialized retaining screw to secure the capillary or sensor lead firmly in place. Built to withstand a maximum operating pressure of 300 psig and temperatures up to 250?F, this immersion well is the industry standard for liquid line sensing in chillers, boilers, and commercial refrigeration racks. For a technician, this means reliable set-point accuracy and a simplified installation process that eliminates the need for field-fabricated mounting solutions.

• Rugged Construction: Utilizes a brass fitting and copper tube for superior thermal conductivity and corrosion resistance.
• High Pressure Rating: Rated for systems up to 300 psig, making it suitable for high-side refrigeration and pressurized hydronic lines.
• Universal Compatibility: Specifically designed for Johnson Controls A19, A28, A419, and A99 temperature sensors.
• Complete Hardware Kit: Includes the essential bushing and retaining screw to ensure the probe remains seated at the bottom of the well.
• Standard Threading: Features a 1/2" NPT external thread for easy integration into existing pipe tees and vessels.

• What size sensor tube fits the WEL11A-601R? This well has a .299" ID, making it ideal for 1/4" and standard 9/32" diameter bulbs and sensors.
• Do I need thermal paste for this well? Yes, for the most accurate response times in immersion well applications, applying a thermally conductive compound inside the tube is recommended.
• Can this be used in steam applications? It is rated for 250?F and 300 psig; always verify the specific saturated steam pressure/temperature curve to ensure it stays within these technical limits.

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.