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The Bard 910-1980 Outdoor Enthalpy Sensor Assembly is an OEM control sensor used with Bard economizer-equipped equipment to help the controller decide when outdoor air is suitable for free cooling. It monitors outdoor air conditions so the economizer can compare heat and moisture content and position dampers correctly for efficiency and comfort. If your unit is failing enthalpy changeover, bringing in outdoor air at the wrong times, or showing sensor-related faults, replacing with the correct Bard 910-1980 sensor assembly helps restore proper economizer operation and reliable ventilation control. Confirm compatibility by matching your economizer model and the parts list in the applicable Bard manual before ordering.