About the measurement
The following methods are used for measurement of pollutants and parame-
ters:
CO2:
Non-dispersive infrared (NDIR)
KM-100 module, PM2.5:
Laser-based light scattering (mie principle)
KM-102 module, TVOC:
Metal-oxide-semiconductor (MOS)
KM-102 module, temperature and relative humidity:
CMOSens® technology
The Sensedge provides realtime measurements, thus it important to consider
other factors that may influence sensor measurement when taking a reading
of air quality. Human breath within several metres of the device will impact
both CO2 and TVOC measurements, and physically touching and interacting
with the Sensedge can have a measurable impact on temperature.
Changes in airflow or currents in an indoor space can all have a measurable
impact on the readings of the Sensedge, and correct usage is vital for accurate
and reliable readings.
Data buffer
The Sensedge takes readings of pollutants and measured parameters every
second, and calculates a minute-by-minute average, which is recorded in the
Sensedge’s onboard memory. When connected to the Internet, these readings
are uploaded once per minute. Should the data connection be lost for a
period of time, all readings will be stored in the data buffer, and automatically
uploaded to the cloud when the Sensedge reconnects. There is no maximum
to the number of historical readings that can be stored in the data buffer and
uploaded upon reconnection.
