Check the listing for details. Carrier HVAC Hall Effect Sensor 50HJ401484. Color: Black, Condition: New – Open box. Listed at 24.99 USD. The Carrier HVAC Hall Effect Sensor 50HJ401484 is a high-quality unit designed for use in HVAC systems. This sensor, made of durable black plastic, is specifically built by Carrier and is ideal for detecting the presence of objects or substances in the system. The Hall Effect Sensor 50HJ401484 is an essential component in ensuring the proper functioning of heating, ventilation, and air conditioning systems, making it a reliable choice for industrial and commercial applications.