G
AERASGARD
®
KLQ - CO
2
The maintenance-free 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 sensor is optionally available with or without display. This CO
2
and mixed gas
sensor is optionally available with or without display. The CO
2
content of air is determined
by a dual beam NDIR sensor (non-dispersive infrared technology). The CO
2
content in air
is determined by a NDIR sensor (non-dispersive infrared 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 con servation are only some of the beneficial results of
employing AERASGARD
®
KLQ-CO
2
sensors.
The new design implies the alternative to choose between three sensibility ranges
for VOC monitoring by means of DIP switches, comparable to three measuring ranges:
LOW for low, MEDIUM (default) 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), 0...5000 ppm,
and 0...10000 ppm is likewise enabled via DIP switches.
Above explanations show that applications for CO
2
measurement, applications for VOC
measurement, but from our point of view first of all applications for a combination of
both measurands do exist. Crucial in this respect is that both of these measurands are
not convertible into each other and derivations to or from another cannot be made.
A NDIR CO
2
measuring instrument measures selectively and cannot detect any VOC,
a VOC mixed gas sensor cannot recognize CO
2
molecules.
TECHNICAL DATA:
Power supply: ........................ 24 V AC ⁄ DC
Average power consumption: ....... < 4 VA at 24 V DC
AIR QUALITY (VOC)
Air quality sensor: .................. VOC sensor (metal oxide)
with automatic calibration
(VOC = volatile organic compounds)
Measuring range: .................... 0…100 % air quality referred to calibrating gas,
multi-range switching
(selectable via DIP switches)
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)
Power supply: ........................ 24 V AC ⁄ DC
CARBON DIOXIDE (CO
2
)
CO
2
sensor: ........................... optical, dual beam sensor (NDIR)
with automatic calibration,
non-dispersive infrared technology,
dual beam measuring method,
including atmospheric pressure compensation
Measuring range, CO
2
:.............
multi-range switching
(selectable via DIP switches)
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 plus 5 % of measured value
Pressure dependence: ............. < ± 0,5 % measured value ⁄ kPa at compensated
versions (standard), otherwise ± 1,6 % of measured
value ⁄ kPa (referred to standard pressure)
Temperature dependence:......... < 5 ppm ⁄ K (referred to 20 °C)
Long-term stability:................. ± 1 % of final value per year
Gas exchange: ........................ by diffusion
Warm-up time: ....................... ca. 1 hour
Ambient temperature: ............. +5 …+40 °C
Response time: ....................... ca. 1 minute
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 70 x 73.5 mm (Thor II)
Cable gland: ........................... M 20 x 1.5 ; 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 x 14 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
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 aut
o
2000 5000 10000 aut
o
1 2 34
ON
2000 5000 10000 aut
o
1 2 34
ON
1 2 34
ON
lo
w
med high aut
o
1 2 34
ON
ATM
Function switch
CO
2
/ VOC
Function
switch
CO
2
/ VOC
Set CO
2
Set CO
2
Set V
OC
Set V
OC
Output air quality (V
OC) 0-10V
Output CO
2
c
ont
ent
0-10V
UB+ 24V A
C/DC
UB- GND
Br
eak
er
Normall
y open
CO
2
range
CO
2
range
VOC
sensibility
VOC
sensibility
Switching threshold adjustment
Atmospheric
pressure sensor
Measuring
range selection
CO
2
Button and LED
for manual
CO
2
setting
Button and LED
for manual
VOC setting
Sensitivity
setting
VOC
Selection
relay for CO
2
or 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)
Breaker
Normally
open contact
changeover
(24 V)
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)
