AQS 51/61 CO2 / TEMPERATURE SENSOR WITH BUILT-IN CONTROLLER
EN1B-0189GE51 R0102
6
FUNCTIONAL TEST OF THE AQS51/61 CO2 AND TEMPERATURE SENSOR
Functional Test
The unit has two LED’s - yellow and red - on the front panel
(found under the front lid). These LED’s indicate the
controller's status.
Yellow LED
- ”Call for maintenance” is lit if an error flag has
been set or the measurement is out of range. In the case of
the AQS61, this information is also shown on the display by
the wrench icon. Any push button press, or executed main-
tenance function, is acknowledged by this LED lighting up.
Red LED
- ”Relay active” is lit when the relay has been
activated (contact closed).
A simple and visual functional test can easily be performed.
Take a breath and blow the air from a distance of a few
centimeters onto the sensor. The sensor will detect a rapid
increase in the carbon dioxide concentration. As a result, the
red LED will light up as the CO
2
level exceeds 1000 ppm
(sensor default setting). 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).
In the case of the AQS61, the present output values of the
outputs OUT1, OUT2 and OUT4 can be viewed on the LCD
by pressing MENU four to six times. The displayed values are
in %FS (percent full scale) and can be compared with the
actual output value measured with a multimeter.
Test Gas Verification
Insert 4 mm plastic tubing in the test gas inlet at the bottom
of the wall plate. The plastic tubing should be inserted as far
as possible into the inlet. Flow test gas at a rate of about 0.5
liter/minute. Check the display (or OUT1 with a multimeter) to
read the CO
2
-value when it has stabilized.
NOTE:
The sensor accuracy is defined at continuous
operation (at least 3 weeks after installation).
Self Diagnostics
The system contains complete self diagnostic procedures. A
full system test is executed automatically every time the
power is turned on. In addition, the sensor probes are con-
stantly checked against failure during operation by checking
the valid dynamic measurement ranges. All EEPROM
updates (initiated by the sensor itself or by external connec-
tions) are checked by subsequent memory read back and
data comparisons.
These different system checks return
error bytes to the system RAM. If any error is detected, the
yellow LED will light up
until the error has vanished and the
error flag is reset. “Warm up” and “Out of Range” are the only
bits that are reset automatically after return to normal state.
All other error bits have to be reset manually after return to
normal state – either by pushing the MENU and ESC buttons
simultaneously for ENTER (AQS61 only) or by power off and
restart.
The error code
number Exxx
can be made to appear on the
LCD (AQS61) by pressing the ”MENU” push button.
Descriptions of the different codes are listed below.
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