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Parameter setting
Sensors Sewi KNX AQS and Sewi KNX AQS/TH-D
• Version: 10.09.2018 • Technical changes and errors excepted.
6.15. CO2 Measurement
Select, whether a
malfunction object
is to be sent if the sensor is faulty.
Use
Offsets
to adjust the readings to be sent.
The unit can calculate a
mixed value
from its own reading and an external value. Set
the mixed value calculation if desired. If an external portion is used, all of the following
settings (threshold values, etc.) are related to the overall reading.
The
maximum reading
can be saved and sent to the bus. Using the "Reset CO2 ma-
ximum value" objects, the value can be reset to the current reading. The value is not
retained after a reset.
6.16. CO2 threshold values
Activate the required CO2 threshold value. The menus for setting the threshold values
are displayed.
300 ppm ... 1000 ppm: fresh air
1000 ppm ... 2000 ppm: used air
1000 ppm = 0.1 %
6.16.1. Threshold value 1, 2, 3, 4
Threshold value
Set, in which cases
threshold values and delay times
received via object are to be
retained. The parameter is only taken into consideration if the setting via object is ac-
tivated below. Please note that the setting "After power supply restoration and pro-
Use malfunction object
No • Yes
Offset in ppm
-100…100; 0
Use external measured value
No • Yes
Ext. Reading proportion of the total reading
5% • 10% • ... • 50% • ... • 100%
Sending pattern for internal and total mea-
sured value
• never
• periodically
• on change
• on change and periodically
At and above change of
(relative to the last measured value)
(if sent on change)
2% • 5% • ... • 50%
Send cycle
(if sent periodically)
5 s • 10 s • ... • 2 h
Use maximum value
No • Yes
Use threshold value 1/2/3/4
Yes • No
