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AERASGARD® ALQ-CO2-W

Multifunctional on-wall sensors and measuring transducers, for CO2 content and air quality (VOC) AERASGARD® ALQ-CO2-W

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530,92 € Price plus shipping

Product group: WG02
Multifunctional on-wall sensors and measuring transducers, for CO2 content and air quality (VOC) AERASGARD® ALQ-CO2-W
Maintenance-free AERASGARD® ALQ - CO2 - W air quality on-wall measuring transducer with active/switching output, automatic calibration (can be deactivated), in an impact resistant plastic housing with quick-locking screws, optionally with/without display, for determining the CO2 content of the air (0...2000 ppm/0...5000 ppm), the air quality in three VOC sensitivity levels (low/ medium/high) as well as temperature (–35...+80 °C) and relative air humidity (0…100% r.H.). The transmitter converts the measured values into a standard signal of 0-10 V or 4...20 mA (switchable).

It is used in offices, hotels, convention centres, apartments, shops, etc. for the purpose of evaluating the indoor climate. This enables energy-saving room ventilation on an as-needed basis, thereby reducing operating costs and improving well-being.

A long-term stable, digital humidity and temperature sensor guarantees precise measuring results.

CO2 measuring is performed using an optical NDIR sensor (non-dispersive infra-red technology). The detection range is calibrated for standard applications such as the monitoring of residential and conference rooms.
Air quality is detected by a VOC sensor (mixed gas sensor for volatile organic substances). This sensor determines the load of contaminated gases in the room air, such as from cigarette smoke, body perspiration, exhaled breathing air, solvent vapours, emissions from building components, etc. Low, medium or high VOC sensitivity can be selected depending on the expected air contamination.
Technical details
Voltage supply
24 V AC/ DC (± 10 %)
Power consumption
< 4.8 W/ 24 V DC typical; < 6.8 VA/ 24 V AC typical; peak current 200 mA
Sensor, VOC
VOC sensor (metal oxide) (VOC = volatile organic compounds),
with manual calibration (via zero button),
with automatic calibration (can be deactivated via DIP switches)
Measuring range, VOC
0...100 % air quality; referred to calibrating gas;
multi-range switching (selectable via DIP switches)
VOC sensitivity low, medium, high
Output, VOC
0 -10 V (0 V = clean air, 10 V = polluted air) or 4...20 mA (selectable via DIP switches,
switchpoint can be adjusted from 0...100 % of the output signal)
Measuring accuracy, VOC
± 20 % of final value (referred to calibrating gas)
Service life
> 60 months (under normal load conditions)
depending on the type of loading and gas concentration
Measuring range, CO2
multi-range switching (selectable via DIP switches)
0...2000 ppm; 0...5000 ppm
Sensor, CO2
Optical NDIR sensor (non-dispersive infra-red technology),
with manual calibration (via zero button),
with automatic calibration (can be deactivated via DIP switches)
Output, CO2
0 -10 V or 4...20 mA (selectable via DIP switches)
Measuring accuracy, CO2
typically ± 30 ppm ± 3 % of measured value
Temperature dependence, CO2
± 5 ppm/ °C or ± 0.5 % of measured value/ °C
(whichever is higher)
Pressure dependence
± 0,13 %/ mm Hg
Gas exchange
by diffusion
Relay output
with potential-free changeover contact (24 V / 1 A)
(assignment selectable via DIP switches, switchpoint adjustable)
Response time
< 2 minutes
Output
0 -10 V or 4...20 mA, working resistance < 800 Ω
(selectable via DIP switches, selected variant applies for all outputs),
with offset potentiometer (± 10 % of the measuring range)
Ambient temperature
–10...+60 °C
Process connection
by screws
Protective tube
stainless steel V2A (1.4301), Ø 16 mm, NL = 55 mm
Electrical connection
0.14 - 1.5 mm² via terminal screws
Housing dimensions
126 x 90 x 50 mm (Tyr 2)
Cable gland
M 16 x 1.5; including strain relief,
exchangeable
Long-term stability
< 2 % in 15 years
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 61326,
according to EMC Directive 2014/ 30/ EU