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

G
Installation and Commissioning
ATTENTION !
The minimum CO concentration of outside air in leafy, hardly industrialised areas is approx. 350 ppm (output voltage = 1.75 V with MR = 0...2000 ppm
2
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 – ABC logic (default)
The automatic background logic is a self-calibrating mechanism that is suitable for use in applications in which the CO
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 CO
minimal with at least 4 cases of sensor exposure to fresh air within 21 days. The ABC logic requires continuous operating cycles of longer than
24 hours in order to function properly.
Manual calibration of carbon dioxide measurement
Manual calibration can be carried out independently of the DIP switch position (ABC logic).
Sufficient fresh air (CO content = 500 ppm) must be provided before and after the calibration procedure!
2
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.
Afterwards, it is mandatory to run the manual calibration procedure. Thereafter the ABC logic may be activated.
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 CO
(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
CO content in ppm
2
0...2000 ppm 0...5000 ppm
– 350
– 500
350 750
400 1000
500 1250
600 1500
700 1750
800 2000
900 2250
1000 2500
1100 2750
1200 3000
1300 3250
1400 3500
1500 3750
1600 4000
1700 4250
1800 4500
1900 4750
2000 5000
Once the aforementioned values have been reached, the respective LED becomes active
(with increasing luminosity of 25 %, 50 %, 75 % and 100 %); LEDs that are already active
continue to be illuminated.
LED 1 LED 2 LED 3
green green yellow
50 % – –
75 % – –
100 % – –
25 % –
50 % –
75 % –
100 % –
25 %
50 %
75 %
100 %
.
2
RCO - W - A
2
LED 4 LED 5
yellow red
– –
– –
– –
– –
– –
– –
– –
– –
– –
– –
– –
25 % –
50 % –
75 % –
100 % –
25 %
50 %
75 %
100 %
concentration regularly drops to
2
. The deviation error remains
2
DIP switches
CO content
2
0...2000 ppm (default)
0...5000 ppm
CO automatic zero point
2
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. 2019 - V32
RCO - W
2
DIP 1
OFF
O N
DIP 3
OFF
O N
DIP 4
OFF
O N
DIP 5
OFF
O N