S+S Regeltechnik AERASGARD RCO2-A NT Notice D'instruction page 7

G
Installation and Commissioning
ATTENTION !
The minimum CO2 concentration of outdoor air in vegetated, hardly industrialised areas is about 350 ppm. The gas exchange in the sensor element takes
place by diffusion. Depending on the changes to the concentration and the flow velocity of the air surrounding the sensor, the reaction of the device to the
change of concentration may take place with a delay. It is imperative that the device is positioned in such way that the air stream flows well around the
sensor. Otherwise the gas exchange may be considerably delayed or prevented. Furthermore, the device should not be set up in the direct air flow of a CO2
source (e.g. exhaled breathing air) in order to avoid incorrect measurements.
Commissioning
After the device is switched on, a self-test and temperature equalisation are performed. Depending on the ambient conditions, this process takes
30-50 minutes (as an option, manual calibration can now be performed). If commissioning with automatic calibration, proceed as follows:
1. Open all windows or set the air conditioning system to use outdoor air
2. Switch on the device and move away from the device. If possible, all persons should leave the room.
3. The device is ready to use after 50 minutes.
Automatic calibration of the CO2 measurement
The regular exchange of fresh air is all that is required for the self-calibration technology in the sensor (CO2 concentrations: 350-500 ppm). The device
detects this condition and performs the calibration automatically. It is sufficient to open the windows or set the air conditioning system to use outdoor air
at regular intervals and to stop all CO2-producing processes that influence the ambient air. Proceed as follows:
Open all windows fully or set the air conditioning system to use outdoor air 1x weekly for 15-20 minutes.
If possible, all persons should leave the room during this time.
Regular ventilation of the rooms and flushing of the duct with fresh air will increase the measuring accuracy of the sensor.
Manual calibration of CO2 measurement
Manual calibration can be carried out independently of automatic calibration. Sufficient fresh air must be provided before and during the calibration procedure
(CO2 concentration: 350-500 ppm). Also make sure that no CO2-producing processes influence the ambient air. Proceed as follows to perform manual calibration:
1. Preparation: Remove the housing cover and open all windows or set the air conditioning system to use outdoor air.
2. Press and hold the "ZERO CO2" button until the flashing LED row changes to a steady light after 5 seconds.
Devices with a display indicate "AUTO 0" and change the countdown from 5 to 600. The calibration process has started.
Keep the windows open or the air conditioning system set to use outdoor air.
3. If possible, all persons should now leave the room.
4. After 10 minutes, the calibration is complete (status LED has gone out, the countdown is complete) and the device should indicate or transmit a CO2
concentration of between 350-500 ppm.
Traffic light indicator
CO2 content LED 1
[ppm] green
350 20 %
416 40 %
482 60 %
548 80 %
614 100 %
680
746
812
878
944
1010
1076
1142
1208
1274
1340
1406
1472
1538
1604
1670
1736
1802
1868
1934
2000
3000
Once the aforementioned values have been reached, the respective LED becomes
active (with increasing luminosity of 20 %, 40 %, 60 %, 80 % and 100 %);
LEDs that are already active continue to be illuminated.
LED 2 LED 3 LED 4
green yellow yellow
– – –
– – –
– – –
– – –
– – –
20 % – –
40 % – –
60 % – –
80 % – –
100 % – –
20 % –
40 % –
60 % –
80 % –
100 %
–
20 %
40 %
60 %
80 %
100 %
RCO2 -A NT Recommendation
LED 5 Level
red
– 1
–
–
2
–
–
3
–
–
4
–
–
5
–
–
–
Notes regarding mechanical mounting and attachment:
–
Mounting shall take place while observing all relevant
–
regulations and standards applicable for the place of
–
measurement (e.g. such as welding instructions, etc.).
–
Particularly the following shall be regarded:
–
– VDE ⁄ VDI directive technical temperature measurements,
–
measurement set - up for temperature measurements.
–
– The EMC directives must be adhered to.
–
– It is imperative to avoid parallel laying of current-
20 %
carrying lines.
40 %
– We recommend to use shielded cables with the shielding
60 %
being attached at one side to the DDC ⁄ PLC.
80 %
Before mounting, make sure that the measuring device
100 %
technical parameters comply with the actual conditions at
the place of utilization, in particular in respect of:
– Measuring range
– Permissible maximum temperature and humidity
– Protection type and Protection class
– Oscillations, vibrations, shocks are to be avoided (< 0.5 g)
Traffic light indicator
Actions
green
no action required
green
prompt airing recommended
yellow
airing recommended
yellow
airing required
red
intensive airing necessary
Rev. 2021 - V13
RCO2 -A NT