S+S Regeltechnik AERASGARD RLQ-W Operating Instructions, Mounting & Installation page 7

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Installation and Commissioning
ATTENTION !
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.
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 substances 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.
Commissioning
After the device is switched on, a self-test and temperature equalisation are
performed. Depending on the ambient conditions, this process takes 30-50
minutes (as an option, manual calibration can now be performed). If commis-
sioning with automatic calibration, proceed as follows:
1. Open all windows or set the air conditioning system to use outdoor air
2. Switch on the device and move away from the device. If possible,
all persons should leave the room.
3. The device is ready to use after 50 minutes.
Automatic calibration of the VOC measurement (permanently active)
The regular exchange of fresh air is all that is required for the self-calibration
technology in the sensor. The device detects this condition and performs the
calibration automatically. It is sufficient to open the windows or set the air
conditioning system to use outdoor air at regular intervals. Make sure that no
harmful substances influence the ambient air during this process. Proceed as
follows:
Open all windows fully or set the air conditioning system to use outdoor air
1x weekly for 15-20 minutes. During this time, the release of gases from
volatile organic substances must be prevented as far as possible.
Regular ventilation of the rooms and flushing of the duct with fresh air will
increase the measuring accuracy of the sensor.
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
disruptions of less than 7 days, the calculation algorithm may be
supported with a manual calibration to adjust the correction value more quickly.
Manual calibration of the VOC measurement
Manual calibration can be carried out independently of automatic calibration.
Sufficient fresh air must be provided before and during the calibration proce-
dure. Also make sure that no harmful substances influence the ambient air.
Proceed as follows to perform manual calibration:
1. Preparation: Prevent the release of gases from volatile organic
substances as far as possible, open windows and set air conditioning
system to use outdoor air, remove the housing cover and wait 15 min.
2. Press and hold the "ZERO VOC" button until the flashing LED row
changes to a steady light after 5 seconds. Devices with a display indicate
"AUTO 0" and change the countdown from 5 to 60. The calibration
process has started. Keep the windows open or
the air conditioning system set to use outdoor air.
3. After 60 seconds, the calibration is complete (status LED has gone out,
the countdown is complete) and the device indicates or transmits the
current VOC concentration.
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.
Offset
The VOC measured value can be adjusted subsequently using the offset
potentiometer. The adjusting range is ± 10 % of the measuring range.
DIP switches
VOC sensitivity
LOW
MEDIUM (default)
HIGH
IAQ (Indoor Air Quality)
DIP switches
VOC sensitivity
LOW
MEDIUM (default)
HIGH
IAQ (Indoor Air Quality)
Output
Voltage 0 -10 V (default)
Current 4...20 mA
Traffic light (5x LEDs)
deactivated
activated
Note: DIP 3 is not assigned!
Level IAQ (Indoor Air Quality)
1 excellent
no action required
2 good
prompt airing recommended
3 moderate
airing recommended
4 poor
increased airing required
5 unhealthy
intense airing necessary
Table according to TVOC guidelines of the German Federal
Environmental Agency to assess indoor air contamination
(Bundesgesundheitsbl - Gesundheitsforsch -
Gesundheitsschutz 2007, 50: 990–1005)
Traffic light indicator
VOC - LED 1 LED 2
green green
content
0 % 25 %
5 % 50 %
10 % 75 %
15 % 100 %
20 % 25 %
25 % 50 %
30 % 75 %
35 % 100 %
40 %
45 %
50 %
55 %
60 %
65 %
70 %
75 %
80 %
85 %
90 %
95 %
100 %
Once the aforementioned values have been reached, the respective
LED becomes active (with increasing luminosity of 25 %, 50 %, 75 %
and 100 %); LEDs that are already active continue to be illuminated.
Rev. 2021 - V36
RLQ - SD
DIP 1 DIP 2
OFF OFF
O N OFF
OFF O N
O N O N
RLQ - W
DIP 1 DIP 2
OFF OFF
O N OFF
OFF O N
O N O N
DIP 4
OFF
O N
DIP 5
OFF
O N
VOC
0...19 %
20...39 %
40...59 %
60...79 %
80...100 %
RLQ - W - A
LED 3 LED 4 LED 5
yellow yellow
– – –
– – –
– – –
– – –
– –
– –
– –
– –
25 % –
50 % –
75 % –
100 % –
25 %
50 %
75 %
100 %
25 %
50 %
75 %
100 %
red
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–