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Installation and operating instructions
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CHAPTER 4
OPERATION
Room sensor AIR1/KWL-VOC 0-10V
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 con-
siderably delayed or prevented.
4.1 General information on air quality
There is no universally uniform standard, which could be applied to a VOC sensor
(Volatile Organic Compounds). The monitored air contains a large number of sub-
stances to which the sensor responds, and gas mixtures are adjusted. Therefore
this sensor does not act selectively, but rather reflects the overall air quality. In
principle, one also cannot state precisely what is "bad air" or what is "good air"
because this is a purely subjective sensation.
4.2 Automatic air quality calibration (permanently active)
We recommend to rinse the sensor every 7 days for 20 minutes or longer with fresh
air
as
a
basis
3 weeks, the minimum output value for air quality is saved. During this period, the
output signal is standardised to the zero point. The maximum correction per interval
is limited here. Long-term drifts and the operation-related ageing of the sensor
element are thus completely eliminated.
Every time the device is switched on, the automatic calibration cycle restarts and
calculates a correction value across the operating period. In case of power disrup-
tions
of
less
supported with a manual calibration to adjust the correction value more quickly.
4.3 Manual calibration of air quality
Sufficient fresh air must be provided before and after the calibration procedure!
We recommend a fresh air supply of at least two hours before starting manual
calibration.
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 60 second countdown runs.
4.4 Putting in operation
After switching on the device, a self-test and tempering period follows. This process
takes around 30 - 50 minutes, depending on the ambient conditions. Manual calibra-
tion can then be performed as an option. Make sure that no harmful substances
influence the calibration process and that the sensor is operated in fresh air.
4.5 Switching point setting
A switching point between 10 % and 95 % of the measuring range can be
selected using the SET potentiometer. A potential-free changeover contact is
available as a switch output.
4.6 Offset
The VOC measured value can be adjusted subsequently using the offset
potentiometer. The adjusting range is ± 10 % of the measuring range.
for
automatic
calibration.
than
7
days,
the
5
Within
a
period
calculation
algorithm
of
approx.
may
be
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