G
AERASGARD
®
KLQ
The self-calibrating microprocessor-controlled duct air quality sensor AERASGARD
®
KLQ
is used to determine the air quality on basis of a mixed gas sensor ⁄ VOC sensor
(VOC = volatile organic compounds).
It is used:
- For air quality measurement in offices, hotels, meeting rooms and convention centres,
apartments, stores, and restaurants, etc.
- For quantitative evaluation of room air pollution with contaminating gases
(cigarette smoke, body perspiration, exhaled breathing air, solvent vapours, emissions
from building members and cleaning agents)
- For adjustable sensitivity regarding the maximum air contamination to be expected
- For room ventilation as-needed, enabled by air changes only taking place when air is
polluted while conserving energy at the same time.
The sensor's service life is depending on the type of burden and gas concentration and is
more than 60 months under normal load conditions. The new design implies the alternative
to choose between three sensibility ranges by means of DIP switches, 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.
VOC is the abbreviation for volatile organic compounds. According to the definition by the
World Health Organization WHO, VOC are organic substances with a boiling range from
60 to 250 °C. Ranking among VOC are for example compounds of the substance groups
alkanes ⁄ alkenes, aromatic compounds, terpenes, halogenated hydrocarbons, esters,
aldehydes, and ketones. There is a large number of native VOC, which in part are released
into the atmosphere also in substantial quantities, e.g. terpenes and isoprene from forests.
TECHNICAL DATA:
Power supply: ........................ 24 V AC ⁄ DC, current consumption ca. 70 mA at 24 V
Power consumption: ................ < 3 VA at 24 V DC
Sensor:................................. VOC sensor (metal oxide),
with automatic self-calibration
Sensor protection: .................. sinter filter, exchangeable, screwed, easy to clean
Measuring range: .................... 0 …100 % air quality; referred to calibrating gas;
multi-range switching
(selectable via DIP switches)
VOC sensibility low, medium, high
Output: ................................. 0 - 10 V (0 V = clean air, 10 V = polluted air) or
4 … 20 mA (selectable via jumper) or
with potential-free changeover contact (24 V),
switchpoint adjustable from 0 …100 % of output signal
Measuring accuracy: ............... ± 20 % of final value (referred to calibrating gas)
Detection of gases: ................. not selective
Electrical connection: .............. 0.14 - 1.5 mm ² via terminals on circuit board
Long-term stability:................. <10 % per year
Warm-up time: ...................... ca. 1 hour
Ambient temperature: ............. 0 ...+ 50 °C
Response time: ...................... < 50 s
Enclosure: ............................. plastic, material polyamide, 30 % glass-globe-reinforced,
with quick-locking screws
(slotted ⁄ Phillips head combination)
colour pure white (similar RAL 9010)
Enclosure dimensions: ............. 72 x 64 x 37.8 mm (Thor III without display)
108 x 70 x 73.5 mm (Thor II with display)
Protective tube: ..................... metal, Ø 16 mm, nominal length NL = 190 mm,
Process connection: ................ by mounting flange, plastic
(included in the scope of delivery),
galvanised steel optional
Cable gland:
M 16 x 1.5 , including strain relief, exchangeable,
max. inner diameter 10.4 mm
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 ca. 36 x15 mm (W x H),
for displaying actual air quality
Connecting diagram
KLQ
Connecting diagram
KLQ - W
1
2
3
4
UB- GND
UB+ supply voltage 24V AC/DC
GND
Output air quality 0-10 V / 4...20mA
1
2
3
4
5
6
7
UB- GND
UB+ supply voltage 24V AC/DC
GND
Output air quality 0-10 V / 4...20mA
Breaker
Normally
open contact
changeover
(24 V)
Schematic diagram
KLQ
KLQ - W
GND terminals (1) and (3)
are connected on the circuit board.
DIP switch (6) is not assigned!
1 2 3 4
5 6 7
1 2 3 4 5 6
ON
min. max.
J1
U
I
Selection
Output
(KLQ-W)
Switching threshold
Relay at KLQ-W
Pushbutton manual
calibration air quality
LED calibration
Selection output:
Voltage (V), default
Current (mA)
Normall
y open
Br
eak
er
UB-GND
UB+ 24V A
C/DC
UB-GND
Output air quality (V
OC)
