The OAC-5000-US has a single-integrated universal standoff mount probe sensor but can handle up to two universal standoff probes. The OAC-5000 interfaces with analog or approved BACnet MS/TP CO2 sensors and occupancy counters when DCV is required. An analog airflow output signal is also provided. The OAC-5000 modulates a proportional damper actuator or variable speed fan (VFD or ECM with analog speed control input) to maintain the outdoor airflow rate when an external binary trigger is active (i.e., occupied mode). The binary trigger is typically provided by a thermostat or other analog or BACnet MS/TP binary output.