Humans exhale Volatile Organic Compounds (VOCs) as well as CO2. The BAPI sensor is able to measure these VOCs, therefore it is as good an indicator of space occupancy as a CO2 sensor. The BAPI Sensor is different from other VOC sensors because it has been optimized for Demand Controlled Ventilation (DCV). Using a calibration algorithm, the sensor value is converted to an output with a high correlation to a CO2 level. This lets you use ASHRAE’s occupancy-based VRP schedule to ventilate.

The CDE and CWE are non-dispersive infrared (NDIR) sensors designed for measuring environmental CO2 concentration in ventilation systems and indoor living spaces. Their measurement range of 0 to 2000 ppm makes them compliant with ASHRAE and other standards for ventilation control
The CWE/CDE Series provides a user-selectable 4 to 20 mA or 0 to 10 Vdc output for versatility. Microprocessor-based digital electronics and a unique self-calibration algorithm improves long-term stability and accuracy.

The BAPI-Stat 3 CO2 Sensor is an accurate and reliable way of incorporating demand controlled ventilation into a building’s HVAC strategy. It has a field selectable output of 0-5 or 0-10V and has been optimized for periodically unoccupied areas. The unit features continuous automatic air pressure compensation for accurate readings despite the weather or the altitude of the installation, which earned the sensor a 2012 AHR Expo Innovation Award. The unit is available as CO2 alone or with temperature, humidity, temp setpoint and override.