S+S Regeltechnik 1501-61A0-7331-231, Operating Instructions Manual

G  

Installation and Commissioning 

Rev.  0000 - V10

ATTENTION !  

The minimum CO

2   

concentration of outside air in leafy, hardly industrialised areas is approx. 350 

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 CO

2

 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 CO

2

. 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

Sufficient fresh air (CO

2

 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.

LED

Recommendation 

RCO

2

 -A  NT

1

green

:  

no action required

2

green

:  

prompt airing recommended

3

yellow

:  

airing recommended

4

yellow

:  

airing required

5

red

:  

intensive airing necessary

Traffic light indicator  

RCO

2

 -A  NT

CO

2

   content   

in ppm

LED 1 

green

LED 2 

green

LED 3 

yellow

LED 4 

yellow

LED 5 

red

350

20 %

–

–

–

–

416

40 %

–

–

–

–

482

60 %

–

–

–

–

548

80 %

–

–

–

–

614

100 %

–

–

–

–

680

20 %

–

–

–

746

40 %

–

–

–

812

60 %

–

–

–

878

80 %

–

–

–

944

100 %

–

–

–

1010

20 %

–

–

1076

40 %

–

–

1142

60 %

–

–

1208

80 %

–

–

1274

100 %

–

–

1340

20 %

–

1406

40 %

–

1472

60 %

–

1538

80 %

–

1604

100 %

–

1670

20 %

1736

40 %

1802

60 %

1868

80 %

1934

100 %

2000
3000

Once the aforementioned values have been reached, the respective LED beco-

mes active (with increasing luminosity of 20 %,  40 %,  60 %,  80 % and 100 %);  

LEDs that are already active continue to be illuminated.