CW Protocol Series is a non‑dispersive infrared (NDIR) sensor designed for measuring CO2 concentration in ventilation systems and indoor living spaces.Its measurement range of 0 to 5000 ppm makes it the premier solution for meeting ASHRAE and other ventilation efficiency standards.CW Protocol devices feature embedded BACnet and Modbus communication protocols,as well as optional temperature and humidity sensors.An adjustable setpoint relay is provided for direct control and alarm applications,and the optional setpoint slider and pushbutton override offer additional local input.