Bosch 8733971028 Gas Sensor

- Refrigerant leakage detection sensor for cased evaporator coils.

- Continuously samples cabinet air and signals the system control when refrigerant concentration rises.

- Enables the equipment to trigger its mitigation response before vapor accumulates.

- Supplied as Cubic sensing element AM4205MD-R454B-H.

- Configured specifically for R-454B refrigerant systems.

- Conforms to UL 60335-2-40 and CSA C22.2 No. 60335-2-40.

- Compact sealed module with integrated flanged mounting bracket and fastener hole.

- Perforated sensing grille positioned to capture heavier-than-air refrigerant collecting low in the cabinet.

- Long factory-wired lead reaches the control board from a low mounting position.

- Keyed plug connector eliminates splicing and field-assembled wiring.

- Alternate part number 8-733-971-028.

The Bosch 8733971028 is a refrigerant leakage detection sensor intended for use in cased evaporator coils, where it continuously samples the air inside the coil cabinet and signals the system control when refrigerant concentration climbs toward an unsafe level, allowing the equipment to trigger its mitigation response before vapor can accumulate in the airstream or surrounding space. Supplied as Cubic sensing element AM4205MD-R454B-H, it is configured specifically for R-454B systems and conforms to UL 60335-2-40 and CSA C22.2 No. 60335-2-40, the standards that govern refrigerant detection in residential and light commercial air conditioning equipment. Its compact sealed module attaches to the coil casing through an integrated flanged bracket with a fastener hole, orienting the perforated sensing grille so that heavier-than-air refrigerant collecting in the lower portion of the cabinet passes directly across the detection element, while the generous factory-wired lead and keyed plug connector let the sensor reach the control board from that low mounting position without splicing or field-assembled wiring.