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Bard part number 9022-085 is an OEM cad cell flame detector (often referenced as a 7006U style cad cell) used in oil burner primary safety circuits to prove flame by sensing light at the burner. When the burner ignites, the cad cell changes resistance and signals the control to keep the burner running, and if flame is lost it helps the control shut down to prevent unsafe fuel buildup. This is an Electrical/Controls component, so matching the correct style and lead configuration matters. Confirm compatibility by checking your Bard unit model and the burner control or cad cell part reference before ordering, especially if your existing assembly crosses to Honeywell C554A1687 or similar equivalents.