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The Bard 8301-045 is an OEM outdoor air temperature sensor used on Bard wall-mount HVAC equipment and related economizer/free-cooling controls to measure outdoor air temperature for proper ventilation and operating decisions. This 20K sensor provides the control board with a stable temperature signal so the unit can manage outdoor air operation and maintain consistent performance under changing weather conditions. Replacing a failed or inaccurate sensor can help resolve erratic economizer behavior and temperature-related faults, and it is a smart match when servicing Bard systems that list 8301-045 as the outdoor air temperature sensor.