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AERASGARD® ALQ-CO2 - Modbus

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

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481,92 €
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Product group: WG02
Multifunctional on-wall sensors and measuring transducers, for CO2 content and air quality (VOC) AERASGARD® ALQ-CO2 - Modbus
The maintenance-free, microprocessor-controlled AERASGARD® AFTM - LQ - CO2 - Modbus and ACO2 - Modbus / ALQ - CO2 - Modbus room climate transmitters with Modbus connection and with/without optional display have been designed for on-wall installation and are used to monitor all measurands of relevance to the climate inside a room. Measurands include air humidity, temperature, CO2 concentration and quality (VOC). By using a single device to monitor all four of these measurands, it is possible to effectively monitor and regulate the entire room climate.
The sensor device measures CO2 in the range of 0...5000 ppm, VOC at one of three selectable sensitivity levels (LOW/MEDIUM/HIGH), temperatures in the range of –35...+80 °C, and relative air humidity from 0...100% r.H. Relative humidity (% r.H.) is the 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 precise measuring results. The CO2 content of the air is measured using an optical NDIR sensor (non-dispersive infra-red technology). The detection range of the sensor is calibrated for standard applications such as the monitoring of residential and conference rooms. Room ventilation on an as-needed basis, improved well-being and increased comfort as well as reduced operating costs through energy conservation are just some of the benefits of employing our AERASGARD® CO2 transmitters. The explanations above show that there are applications for CO2 measurement and for VOC measurement, 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 cannot be derived from one another. An NDIR CO2 sensor measures selectively and cannot detect any VOC; a VOC or mixed gas sensor cannot recognise CO2 molecules.
Technical details
Voltage supply
24 V AC/ DC (± 10 %)
Power consumption
< 4.4 W/ 24 V DC typical; < 6.4 VA/ 24 V AC typical;
peak current 200 mA
Data points
temperature, relative humidity,
air quality (VOC), carbon dioxide (CO2),
atmospheric pressure
Sensor, VOC
VOC sensor (metal oxide) with automatic calibration
(VOC = volatile organic compounds)
Measuring range, VOC
0...100 % air quality; referred to calibrating gas;
multi-range switching (selectable via DIP switches)
VOC sensitivity low, medium, high
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
0...5000 ppm
Sensor, CO2
optical NDIR sensor (non-dispersive infra-red technology)
with automatic and manual calibration
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
Response time
< 2 minutes
Ambient temperature
–10...+60 °C
Bus protocol
Modbus (RTU mode),
address range 0...247 selectable
Signal filtering
4 s / 32 s
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 push-in terminal
Cable connection
cable gland, plastic (M 16 x 1.5; with strain relief, exchangeable, max. inner diameter 10.4 mm) or
M12 connector according to DIN EN 61076-2-101 (optional on request)
Housing dimensions
126 x 90 x 50 mm (Tyr 2)
Cable gland
2x 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