Elsner Cala KNX AQS/TH, Installation And Adjustment, Page: 10 / 98

8 Installation and commissioning
Sensor with Cala KNX display • Version: 13.03.2017 • Technical changes and errors excepted.
* Please note the information on Measuring accuracy
, page 8
The product is compliant with the provisions of EC guidelines.
1.1.1. Measuring accuracy
Measurement deviations due to sources of interference (see chapter Installation loca-
tion ) must be corrected in the ETS in order to ensure the specified accuracy of the sen-
sor (offset). For a correct CO
2
measurement it is necessary to install the device in a
windproof socket.
The specified CO
2
measurement accuracy is achieved after a run-in of 24 hours
(without bus voltage interruption), if the sensor comes into contact with fresh air
(350…450 ppm) at least once during this period. During the warm-up phase the reading
may not be displayed at all or wrongly, or remain frozen at 2001.
After this, the CO
2
-sensor performs a self-calibration every two weeks, in which the
lowest CO
2
-value measured during this period (without bus voltage interruption) is tak-
en as a reference for fresh air.
In order to ensure permanent accuracy, the sensor should be supplied with fresh air at
least once every two weeks. This is normally the case during room ventilation.
During Temperature measurement , the self-heating of the device is taken into con-
sideration by the electronics. It is compensated for by the software, therefore the dis-
played/output inside temperature measuring value is correct.
2. Installation and commissioning
2.1. Installation notes
Installation, testing, operational start-up and troubleshooting should
only be performed by an electrician.
Temperature accuracy* ± 0.8°C at -25…-10°C
± 0.5°C at -10…+65°C
± 0.6°C at +65…+70°C
Humidity sensor (for Cala KNX AQS/TH, Cala KNX TH):
Humidity measuring range 0% HR … 100% HR
Humidity resolution 0.1%
Humidity accuracy ±7,5% HR at 0...10% HR
±4,5% HR at 10...90% HR
±7,5% HR at 90...100% HR
Humidity drift ± 0.5% RH per year in normal atmosphere