ALQ-CO2-W

AERASGARD® ALQ-CO2-W

Item No. 1501-7111-7301-200
EAN 4 251325 613451

The maintenance-free microprocessor-controlled on-wall sensor AERASGARD® ALQ-CO2 - W with automatic calibration (can be deactivated via DIP switches) is used for detecting the overall room climate. It measures CO2 within a range of 0...2000 ppm or 0...5000 ppm, air quality (VOC) in one of three sensitivity levels that can be selected LOW / MEDIUM (default) / HIGH, temperature within a range of –35...+80 °C as well as relative ambient humidity of 0...100 % r.H. The measured values are converted into standard signals of 0 -10 V or 4...20 mA (selectable via DIP switches). As an option, the measured values can be shown continuously in the illuminated display.

The relative humidity (% r.H.) quotient of water vapour partial pressure divided by the saturation vapour pressure at the respective gas temperature. A digital, long-term stable sensor used as measuring element for relative air humidity and temperature guarantees exact measurement results.

The CO2 content of the air is measured using an optical NDIR sensor (non-dispersive infra-red technology). The detection range of the sensors is calibrated for standard applications such as monitoring residential rooms and conference rooms. Room ventilation on an as-needed basis, improved well-being and customer benefit, increased comfort as well as reduced operating costs through energy conservation are just some of the benefits of employing the AERASGARD® CO2 sensor.

The explanations above demonstrate that there are applications for CO2 measurements, for VOC measurem ents, but from our perspective, above all, for a combination of both measurands. The crucial factor in this respect is that both of these measurands are not convertible into each other and derivations to or from one another cannot be made. An NDIR CO2 measuring instrument measures selectively and cannot detect any VOC; a VOC mixed gas sensor cannot recognize CO2 molecules.

416,16 € net
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)
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 plastic, UV-stabilised,
material polyamide, 30 % glass-globe reinforced,
with quick-locking screws
(slotted/ Phillips head - combination),
colour traffic white (similar to RAL 9016)
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