Honeywell S301D2CO Sensor R-410A The retaining ring is critical

The retaining ring is critical for two-piece split sleeves

ensuring durable operation across air

Thermal Management: Features a high-efficiency aluminum heat sink designed for vertical mounting to ensure optimal heat dissipation

Manual Control: Features a color-coded AC (red) pushbutton and override lever to lock contacts in the powered position during testing

Common Questions & Technical Support: How do I confirm this coil is compatible with my current valve

Honeywell S301D2CO Sensor R-410A The retaining ring is criticalThe Honeywell S301D2CO is a heavy duty Carbon Monoxide (CO) sensor engineered specifically for classified hazardous areas requiring explosion proof gas detection. Designed as the direct 129431 L3 replacement, this sensor integrates seamlessly into existing 301 C controller systems via a Modbus RTU RS485 communication protocol. Built for industrial environments, the assembly features an electrochemical sensing element housed in a rugged enclosure,