Check the listing for details. Honeywell S3KXSO1SS Ammonia Electrochemical Cell Sensor Cartridge O2 Exp 10/2019. Condition: Used. Listed at 155.00 USD. Honeywell S3KXSO1SS Ammonia Electrochemical Cell Sensor Cartridge O2 OXYGEN EXP 28 OCT 2019 This Honeywell sensor cartridge is a reliable choice for detecting ammonia in your HVAC or refrigeration system. The XNXXSO1SS model is designed for use with the S3KXSO1SS sensor, and is compatible with a range of HVAC and refrigeration systems. With its high-quality construction and advanced features, this sensor cartridge is an excellent investment for any business or industrial property. It is easy to install and provides accurate and reliable readings, making it an ideal choice for monitoring the levels of ammonia in your system. Order yours today and enjoy the peace of mind that comes with knowing your HVAC and refrigeration systems are running smoothly and efficiently.