Datasheet
14
ENS160 Datasheet v0.95 preliminary / December 2020
8 Signal Conditioning
Chemical gas sensors are relative sensors that are susceptible to changes in their chemical
and physical environments. Typical drivers are changes of the target gas(es), of the
interfering background gas mixture and changes of the physical environment (air pressure,
humidity, etc.).
8.1 Baselining
As part of the TrueVOC technology the ENS160 deploys an automatic baseline correction,
featuring compensation for oxidizing gases such as ozone. It furthermore stores the current
baseline value in non-volatile memory to automatically start from the latest valid level of
background air after re-powering the device and even after a power outage.
8.2 Humidity Behavior & Compensation
Figure 9: Air Quality Signal with and without Humidity Compensation
For use in normal air quality applications
(eCO
2
, TVOC, AQI), operated in a relative
humidity range between 20 and 80%, the
ENS160 does not require external humidity
compensation, as the opposite graph shows.
Extreme humidity conditions outside this
range (20% - 80%RH) can influence the output
signal, especially when very accurate or
single gas measurements are required. To
overcome such impacts, the ENS160 is
equipped with a temperature and humidity
compensation algorithm, relying on data
from an external temperature- and humidity-
sensor (the ENS160 works well with the
ScioSense ENS21x family of temperature and
humidity sensors as they both share the same
signal format), that can be regularly updated
to an internal register for processing.
Note: Unless otherwise stated, the humidity compensation discussed in this section works
per default for all output signals except for sensor raw signals.
See sections for further information.