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Senseair aSENSE M III Manual

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15. Push MENU(+) to reach the setting of the MAX value. The display shows Set H.
16. Push ENTR(+-) to set the MAX value of the output. The display shows the numerical value in
% e.g. the standard setting 100.0 % or previously set value. Push MENU(+) to increase the
MAX value. Push ESC(-) to decrease the MAX value. Push ENTR(+-). The display shows
Sure. Push ENTR(+-) to save the 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 aSENSE mIII
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).
… 11 …


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