Instructions
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2. INSTRUCTIONS FOR USE
When using this module, please note that you must perform a so-called
Burn-In. This means that for the first 48 hours you will take measure-
ments with the sensor in the mode of your choice. This is because the re-
sistances and sensitivity changes within these first 48 hours, which makes
the measurement results inaccurate within this time.
There is also the so-called Run-In. This means that within the first 20 mi-
nutes aer the sensor has been idle for a long time or aer changing mo-
des, the sensor must stabilize before it can generate accurate data.
The so-called modes, which this sensor has, designate the time intervals
in which measurements are performed. The CCS811 has these modes:
Mode 0 Idle
(no measurements are performed)
Mode 1 IAQ measurement every second
Mode 2 IAQ measurement every 10 seconds
Mode 3 IAQ measurement every 60 seconds
Mode 4 IAQ measurement every 10 ms
(eCO
2
and TVOC are not calculated)
In modes 1, 2 and 3, eCO
2
and TVOC are calculated each time. Mode 1
reacts fastest to a change, but has a higher operating current. Mode 3
reacts more slowly, but has the lowest operating current on average.
If you change the mode to a slower measuring rate, you should switch to
mode 0 (idle) for at least 10 minutes. This happens, for example, when
you switch from Mode 1 to Mode 3. If you switch to a higher measuring
rate, you do not need to pay any further attention.
Mode 4 is used with an external system. The system receives the raw data
of the sensor to work with it. This allows the measurement rate of one
measurement every 250 ms.
Note: Mode timings are subject to typical 2% tolerance due to accuracy
of internal clock.