S+S Regeltechnik AERASGARD KCO2-W Notice D'instruction page 7

G
Mounting and Installation
ATTENTION!
The minimum CO concentration of outdoor air amounts to approx. 350 ppm (output voltage = 1.75 V at MR = 2000 ppm or 0.7 V at MR = 5000 ppm)
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in leafy, hardly industrialised areas. Gas inter-exchange in the sensor element happens by diffusion. Depending on changes in the concentration and flow
velocity of the air surrounding the sensor, the reaction of the device to changes in CO
to choose the device mounting position to ensure that the air stream "presses" into the duct tube. Otherwise, below-atmospheric pressure will develop
in the duct tube that may cause a substantial deceleration of gas exchange of even prevent it.
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 regardless of the position of the DIP switch (ABC logic).
Before and during the calibration process, sufficient fresh air (CO
The calibration process is started by pressing the "ZERO" button (approx. 5 seconds).
This is signalled by the flashing LED or the countdown timer on the display (AUTO 0).
The calibration follows. During this phase, the LED is constantly active and a 600-second countdown runs
on the display CAL 0). The LED is deactivated after successful calibration.
Display
The first line shows the CO measured value in ppm.
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In the second line, the switching status of the relay is shown on the left as a circuit
●
(full = relay energised; empty
followed by the indicator (C for CO
and the switchpoint value is shown on the right.
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.
Switchpoint configuration
The SET potentiometer can be used to select a switchpoint between 10 % and 95 %
of the measuring range. The 10 % is added to the fresh air limit of 400 ppm.
A potential-free changeover contact is available as a switching output.
Offset
Subsequent adjustment of the CO
the offset potentiometer. The adjustment range is ± 10 % of the measuring range.
AERASGARD ® KCO - SD – Duct CO
2
®
AERASGARD KCO - W – Duct CO
2
Type ⁄ WG02 Measuring Range
CO
2
KCO - SD (switchable)
2
K C O 2 - S D - U 0...2000 ppm ⁄ 5000 ppm
KCO - W (switchable)
2
K C O 2 -W 0...2000 ppm ⁄ 5000 ppm
K C O 2 -W D I S P L AY 0...2000 ppm ⁄ 5000 ppm
Note: This unit must not be used as safety-relevant device!
○
= relay de-energised)
)
2
measured value can be carried out using
2
sensors and measuring transducers, Standard
2
sensors and measuring transducers, Premium
2
Output
CO
2
(fixed)
0 -10 V
(switchable)
0 -10 V ⁄ 4...20 mA
0 -10 V ⁄ 4...20 mA
concentration may appear with a delay. It is absolutely necessary
2
content = 500 ppm) must be provided.
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Equipment
–
changeover contact
changeover contact, display
Rev. 2018 - V37 GB
concentration regularly drops to
2
. The deviation error remains
2
DIP switch
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
Note: DIP 2 is not assigned!
KCO
DIP switch
CO content
2
0...2000 ppm (default)
0...5000 ppm
Display Item No.
IP 43
1 5 0 1 - 3 1 6 0 - 1 0 0 1 - 2 0 0
IP 65
1 5 0 1 - 3 1 4 0 - 7 3 0 1 - 2 0 0
■ 1 5 0 1 - 3 1 4 0 - 7 3 2 1 - 2 0 0
KCO
- W
2
DIP 1
OFF
O N
DIP 3
OFF
O N
DIP 4
OFF
O N
- SD
2
DIP 1
OFF
O N