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

G
Installation and Commissioning
ATTENTION !
The minimum CO2 concentration of outside air in leafy, hardly industrialised areas is approx. 350 ppm (output voltage = 1.75 V with MR = 0...2000 ppm
or 0.7 V with MR = 0...5000 ppm). The gas inter-exchange in the sensor element happens by diffusion. Depending on the changes to the concentra-
tion 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 essential to choose an installation location for the device in which the air stream flows around the sensor. Otherwise the gas exchange may
be considerably delayed or prevented.
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 min.
(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.
Switching point setting
A potential-free changeover contact is available as a switch output.
A switching point between 10 % and 95 % of the measuring range can be selected using the SET potentiometer.
The 10 % value is added to the fresh air limit of 400 ppm for CO2.
(600...1900 ppm with MR = 0...2000 ppm or 900...4700 ppm with MR = 0...5000 ppm).
Offset
Each measuring channel has a separate offset potentiometer for subsequent adjustment of the measurement.
The adjusting range is ± 10 % of the measuring range.
Traffic light indicator
CO2 content in ppm
0...2000 ppm 0...5000 ppm
350 350
416 536
482 722
548 908
614 1094
680 1280
746 1466
812 1652
878 1838
944 2024
1010 2210
1076 2396
1142 2582
1208 2768
1274 2954
1340 3140
1406 3326
1472 3512
1538 3698
1604 3884
1670 4070
1736 4256
1802 4442
1868 4628
1934 4814
2000 5000
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 1 LED 2 LED 3
green green yellow
20 % – –
40 % – –
60 % – –
80 % – –
100 %
– –
20 % –
40 % –
60 % –
80 % –
100 % –
20 %
40 %
60 %
80 %
100 %
RCO2 - W - A
LED 4 LED 5
yellow red
– –
– –
– –
– –
– –
– –
– –
– –
– –
– –
– –
– –
– –
– –
– –
20 % –
40 % –
60 % –
80 % –
100 % –
20 %
40 %
60 %
80 %
100 %
DIP switches
CO2 content
0...2000 ppm (default)
0...5000 ppm
CO2 autom. calibration
deactivated
activated (default)
Output
Voltage 0 -10 V (default)
Current 4...20 mA
Traffic light (5x LEDs)
deactivated
activated
Note: DIP 2 is not assigned!
Rev. 2021 - V35
RCO2 - W
DIP 1
OFF
O N
DIP 3
OFF
O N
DIP 4
OFF
O N
DIP 5
OFF
O N