Table Des Matières - S+S Regeltechnik THERMASGARD FSTM Notice D'instruction

G
AERASGARD FSCO
®
Connecting diagram
4
UB-
GND
4
UB+
3
24 V
3
AC/DC
free
Connecting diagram
4
UB-
GND
4
UB+
3
24 V
3
AC/DC temperature [°C]
free
⁄ FSTM-CO
2 2
FSCO
2
free
6
Output 0-10V
6
CO [ppm]
2
free
free
FSTM - CO
2
free
6
Output 0-10V
6
CO [ppm]
2
7
Output 0-10V
7
free
ATTENTION !
The minimum CO concentration of outside air in leafy, hardly industrialised areas is
2
approx. 350 ppm (output voltage = 1.75 V with MR = 0...2000 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
(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 . The deviation error remains minimal with at least 4 cases of sensor exposure
2
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 irrespective of the ABC logic.
Sufficient fresh air (CO content = 500 ppm) must be provided
2
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.
Afterwards, it is mandatory to run the manual calibration procedure!
13
concentration regularly drops to fresh air level
2
Rev. 2019 - V11