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Mounting and Installation
ATTENTION!
The minimum CO
concentration of outdoor air amounts to ca. 350 ppm
2
(output voltage = 1.75 V) in leafy, hardly industrialized areas. A sensor
self-test is initiated by above-atmospheric or below-atmospheric pres-
sure or by exposure of the sensor to more than 5000 ppm CO
output voltage (CO
output) amounts to ca. 0.2 Volt during the self-test.
2
Gas inter-exchange in the sensor element happens by diffusion. Depend-
ing on changes in the CO
concentration and flow velocity of the air sur-
2
rounding the sensor, the reaction of the device to changes in CO
centration may appear with a delay. It is absolutely necessary to choose
the device mounting position so that the air stream "presses" into the
duct tube. Otherwise, below-atmospheric pressure will develop in the
duct tube that may cause a substantial slow down of gas exchange or
even prevent it.
Automatic calibration of carbon dioxide measurement (default)
The device calibrates itself at an interval of 7 days. To ensure this
function, the device needs to be supplied with fresh air (CO
300 ppm ... 400 ppm) at least for 10 minutes during each 7-day period.
For self-calibration, the devices memorises device-internally the CO
content minimum value measured during a 7-day period. After 7 days,
this minimum value is standardised to 350 ppm CO
signal is corrected accordingly. The maximum amount of correction is
here limited to 40 ppm ⁄ interval.
Manual calibration of carbon dioxide measurement
Manual calibration can be started independently from the position of
jumper J3 by pushing the button. After connecting the device, a period
of at least 10 minutes of continuous operation of the device at fresh
air (CO
content 300 ppm ... 400 ppm) is to be ensured. Manual calib-
2
ration of the output signal to 1.75 V (350 ppm = zero-point) is started
by pressing the button "Manual calibration CO
Preparing for calibration is indicated by a blinking LED. Setting the
output to 1.75 V at actual ambient conditions follows automatically
there after. During this phase, the LED is permanently activated. After
calibration is completed, the LED is deactivated.
Putting in operation
After switching on the device, a self-test and tempering period follows.
This procedure takes 3 to 5 minutes, depending on ambient conditions.
During this time, the output analog voltage differs from the actual meas-
ured value.
Type ⁄ WG1
Measuring Range
CO
2
KCO
- LC
0 ... 2000 ppm
2
KTM - CO
- LC
0 ... 2000 ppm
2
KCO
0 ... 2000 ppm ⁄ 0 ... 5000 ppm ⁄ 0 ... 10000 ppm
2
KCO
- W
0 ... 2000 ppm ⁄ 0 ... 5000 ppm ⁄ 0 ... 10000 ppm
2
ATM = Sensor for atmospheric pressure compensation included
xx - Display
Note:
This unit must not be used as safety-relevant device!
2
and the output
2
" (for ca. 5 seconds).
2
(switchable)
CO
content
2
(measuring range adjustable)
0 ... 2000 ppm (default)
. The
2
0 ... 5000 ppm
0 ... 10000 ppm
CO
calibration mode
con-
2
2
Automatic self-calibration
Manual calibration
content
2
Output
CO
Temperature
2
0 - 10 V
–
0 - 10 V
0 - 10 V
0 - 10 V
–
0 - 10 V
–
DIP 1
DIP 2
DIP 3
O N
OFF
OFF
OFF
O N
OFF
OFF
OFF
O N
DIP 4
O N
OFF
Features
–
ATM
ATM
ATM, Changeover contact
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