G
AERASGARD
®
KLQ - CO
2
The self-calibrating microprocessor-controlled AERASGARD
®
KLQ-CO
2
is designed
for duct installation and is used to detect the air quality regarding VOC and the CO
2
content in air. This CO
2
and mixed gas sensor is optionally available with or without
display. Optionally, the CO
2
measuring transducer can be supplied with switching
output. The CO
2
content in air is determined by a NDIR sensor (non-dispersive infra-
red technology). The detection ranges of these sensors are calibrated for standard
applications such as monitoring of residential rooms or conference rooms. Room
ventilation on an as-needed basis, improvement of well-being and customer benefit,
increased comfort as well as a reduction of operating costs by energy conservation
are only some of the beneficial results of employing AERASGARD
®
KLQ-CO
2
sen-
sors. The new design implies the alternative to choose between three sensibility
ranges for VOC monitoring by means of jumpers, comparable to three measuring
ranges: LOW for low, MEDIUM (default, equivalent to the hitherto existing type of
this device) for medium, and HIGH for high VOC sensibility. Also three measuring
ranges were introduced for CO
2
content measurement. The selection between the
measuring ranges 0...2000 ppm (default, equivalent to the hitherto existing type of
this device), 0...5000 ppm, and 0...10000 ppm is likewise enabled via jumpers.
TECHNICAL DATA:
Power supply: .................................. 24 V AC ⁄ DC
AIR QUALITY (VOC)
Air quality sensor: .......................... VOC sensor (metal oxide)
(VOC = volatile organic compounds)
Measuring range: ........................... 0…100 % air quality referred to calibrating gas,
multi-range switching (selectable via jumpers)
VOC sensibility: LOW – MEDIUM – HIGH
Output, air quality: ......................... 0 - 10 V (0 V = clean air, 10 V = polluted air)
or with potential-free changeover contact (24 V)
Measuring accuracy , VOC: .......... ± 20 % of final value (referred to calibrating gas)
Service life: ...................................... > 60 months (under normal load conditions)
CARBON DIOXIDE (CO
2
)
CO
2
sensor: ..................................... optical sensor (NDIR),
non-dispersive infrared technology
Measuring range, CO
2
: ................. multi-range switching (selectable via jumper)
0 … 2000 ppm; 0 … 5000 ppm; 0 … 10000 ppm
Output CO
2
: ..................................... 0 - 10 V or with
potential-free changeover contact (24 V)
Measuring accuracy, CO
2
: ............ ± 100 ppm
Pressure dependence: .................. ± 1.6 % ⁄ kPa (referred to standard pressure)
Long-term stability: ....................... ± 1 % of final value per year
Service life: ...................................... > 12 years
Gas exchange: ................................. by diffusion
Electrical connection: .................... 0.14 - 1.5 mm
2
,
via screw terminals on circuit board
Enclosure: ........................................ plastic, polyamide,
30 % glass-globe-reinforced,
with quick-locking screws,
colour pure white (similar RAL 9010)
Dimensions: ..................................... 108 x 73.5 x 70 mm
Cable gland: ..................................... M16, including strain relief
Protective tube: ............................. metal, Ø 20 mm,
nominal length NL = 190 mm
Process connection: ..................... by mounting flange, plastic,
(included in the scope of delivery),
galvanised steel optional
Protection class: ........................... III (according to EN 60 730)
Protection type: ............................. IP 65 (according to EN 60 529)
Standards: ...................................... CE-conformity,
electromagnetic compatibility
according to EN 61 326 + A1 + A2,
EMC directive 2004 ⁄ 108 ⁄ EC
Optional: ........................................... 8-digit display, cutout 36 x14 mm (W x H),
for displaying actual air quality (VOC)
and actual CO
2
content (alternating)
Connecting diagram
KLQ - CO
2
Connecting diagram
KLQ - CO
2
- W
1
2
3
4
UB- GND
UB+ supply voltage 24V AC/DC
Output 0-10V CO
2
-content in ppm
Output 0-10V air quality (VOC)
1
2
3
4
5
6
7
UB- GND
UB+ supply voltage 24V AC/DC
Output 0-10V CO
2
-content in ppm
Output 0-10V air quality (VOC)
Normally open
contact
Breaker
Schematic diagram
KLQ - CO
2
KLQ - CO
2
- W
1
2
3
4
5
6
7
(KLQ-CO
2
-W)
min. max.
lo
w
med
high
2000
5000
10000
manu/auto
manu/auto
CO
2
/ VOC
Function switch
set CO
2
set VOC
Br
eak
er
Normall
y
open
Output air quality (V
OC) 0-10V
Output CO
2
c
ont
ent
0-10V
UB+ 24V A
C/DC
UB- GND
VOC sensibility
CO
2
range
