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The Bard 8301-019 is an OEM outdoor humidity sensor used on Bard HVAC systems to provide an outdoor relative humidity signal for humidity control strategies such as ventilation, economizer logic, and dehumidification enable based on ambient conditions. Designed for outdoor mounting, it supplies a control-ready DC output (listed as 1-4 DC) with 5% accuracy so compatible Bard controls can make stable, repeatable decisions without nuisance swings. When replacing this sensor, match the original wiring and mounting location and verify the required output range at the controller inputs to ensure correct readings and proper system operation.