cns-
enocean
Batteryless CO2 Sensor User Guide
Page 6 of 8
Rev 1.1
Website:
www.control-network-solutions.co.uk
2. Calibration
The CO2 sensor has been factory calibrated prior to supply. Like all CO2 sensors, it does
need to update its calibration status periodically. In normal environments, background
CO2 levels are typically 450ppm.
Auto Calibration ON/OFF
Auto calibration ON calibrates the reported background level of CO2 against the lowest
measured values of CO2 taken over an 8 day period. Auto calibration is the preferred
operating mode of the CO2 sensor, however to maintain accuracy, there must be periods
of low room occupancy (only background CO2 present) during the 8 day period.
Manual Calibration
When auto calibration is not used, it may be beneficial to recalibrate the unit’s
background CO2 level of 450ppm.
To recalibrate the default level of 450ppm, set DIP Switch 3 to ON and depress the learn
key for 5 seconds. The unit’s LED will flash once per second for 300 seconds. During
this time, take the unit into an unoccupied environment. After the 300 seconds, the
unit will take 120 CO2 measurements in a 60 second period (the LED will flash quickly
during this period). Once the LED has stopped flashing, the unit is recalibrated. Return
DIP switch 3 to the OFF position. Moving DIP switch 3 back to OFF during the procedure
will abort the calibration.
Operating Mode (Calibration)
DIP Switch 2 Dip Switch 3 Learn Button
Sensor auto calibrates every 8
days
ON
OFF
N/A
Sensor uses factory calibration
level (450ppm)
OFF
OFF
N/A
Sensor
uses
recalibrated
background level on completion
OFF
ON
Pressed
