ROTRONIC CF8-W-Disp-CO - Manual (Page 12)

Dokument
UMA 147 Rev
1 Page
12 (16)
setting and return to Set H. Push MENU(+) or ESC(-) to return to Set H
without saving the new setting. Push ESC(-) to return to the output to be set,
item 12. Push ESC(-) once again to return to the setting of analogue outputs
item 11.
17. Push MENU(+) to reach the calibration with fresh air. The sensor needs fresh
air, air with 400 ppm carbon dioxide. The display shows CALb. Push ENTR(+-
). The display shows Sure. Push ENTR(+-) to confirm that a background
calibration should be done. After completed background calibration the sensor
returns to DEFAULT. If a background calibration should not be executed push
MENU(+) or ESC(-). The background calibration has a time limit.
18. Push MENU(+) to reach the zero point calibration. The sensor needs carbon
dioxide free air or gas. . The display shows CAL. Push ENTR(+-). The display
shows Sure. Push ENTR(+-) to confirm that a zero point calibration should be
done. After completed zero point calibration the sensor returns to DEFAULT. If
a zero point calibration should not be executed push MENU(+) or ESC(-). The
zero point calibration has a time limit.
FUNCTIONAL TEST of CO
2
/ CO sensor CF8-W-Disp-
CO
Functional test
The unit has three LED’s – green, yellow and red. These LED’s indicate the status of
the controller. An internal delay function prevents the alarm functions of the relay and
OUT4 output during two minutes after power up. The alarm outputs may be tested
after the two minutes delay
Green LED - ”No alarm situation” is lit, when the relay is contact closed.
Yellow LED - ”Call for maintenance” is lit, if an error flag is set or the measurement is
out of range. This information is also shown on the display by the wrench icon. Any
push button press, or executed maintenance function, is acknowledged by emission
from this LED. If an error has been detected both the yellow and red LEDs are lit.
Red LED - ”Alarm high gas concentrations” is lit, when the open collector output is
activated (contact closed). The CO concentration is 35 ppm or more OR the CO
2
concentration is 1500 ppm or more OR if the yellow LED is lit.
A simple and visual functional test can easily be performed. Take a breath and blow
the air from a distance of a few centimetres on the sensor. The sensor will detect a
rapid increase in the carbon dioxide concentration. The red LED is lit and the green
LED is turned off when the CO or CO
2
concentration goes above the pre-set value. If
the sensor is connected to a controller, the flow of the ventilation system will
eventually increase by change of the fan speed or opening of a damper actuator
(depending on the installation/application).