Installation And Commissioning - S+S Regeltechnik Aerasgard Rco2-W Bedienungs- Und Montageanleitung

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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 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 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.
Automatic calibration of the carbon dioxide measurement – (default)
The automatic background logic is a self-calibrating mechanism that is suitable for use in applications in which the CO2 concentration regularly drops
to fresh air level (350 - 400 ppm). This should typically happen attimes during which the rooms are unoccupied. The sensor reaches its normal
accuracy after 24 hours of continuous operation in an environment which has been exposed to a fresh air supply of 400 ppm CO2. The deviation error
remains minimal with at least 4 cases of sensor exposure to fresh air within 21 days. The device needs continuous operating cycles of more than 24
hours to operate correctly
Manual calibration of carbon dioxide measurement
Manual calibration can be carried out independently of the DIP switch position.
Sufficient fresh air (CO2 content = 500 ppm) must be provided before and after the calibration procedure!
The calibration procedure is started by pressing the "ZERO" button (for approx. five seconds).
This is signalled via the flashing LED.
Then calibration takes place. During this phase, the LED is continuously active and a 600 second countdown runs.
The LED is deactivated after successful calibration.
Putting in operation
After switching on the device, a self-test and tempering period follows. This procedure takes 30 - 50 minutes depending on ambient conditions.
Manual calibration can then be performed as an option. Make sure that no harmful substances influence the calibration process and that the
sensor is operated in fresh air.
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 automatic zero point
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