Room air quality sensor / room CO2 and air quality sensor AERASGARD® RLQ-CO2 - Modbus

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Product group: WG02
Room air quality sensor / room CO2 and air quality sensor AERASGARD® RLQ-CO2 - Modbus
The maintenance-free, microprocessor-controlled AERASGARD® RFTM - LQ - CO2 - Modbus and RCO2 - Modbus / RLQ - CO2 - Modbus air quality transmitters with Modbus connection, with/without optional display, in an elegant plastic housing with snap-on cover and 4-hole attachment base, are used to monitor the entire room climate. Measurands include air humidity, temperature, CO2 concentration and air 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 devices measure CO2 in the range of 0...5000 ppm, VOC at one of three selectable sensitivity levels (LOW/MEDIUM/HIGH), temperatures in the range of 0...+50°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 air quality is determined with a VOC (mixed gas) sensor. The CO2 content of the air is measured using an optical NDIR sensor (non-dispersive infra-red technology).
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)
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
Warm up time
approx. 1 hour
Response time
< 2 minutes
Ambient temperature
0...+50 °C
Bus protocol
Modbus (RTU mode),
address range 0...247 selectable
Signal filtering
4 s / 32 s
Electrical connection
0.14 - 1.5 mm², via push-in terminal
plastic, material ABS,
colour pure white (similar to RAL 9010)
98 x 98 x 33 mm (Baldur 2)
wall mounting or on in-wall flush box, Ø 55 mm,
base with 4 holes, for attachment to vertically or
horizontally installed in-wall flush boxes for rear cable entry,
with predetermined breaking point for cable entry
from top/ bottom in case of plain on-wall installation
Long-term stability
< 2 % in 15 years
Protection class
III (according to EN 60 730)
Protection type
IP 30 (according to EN 60 529)
CE conformity, electromagnetic compatibility
according to EN 61 326, EMC Directive 2014/ 30/ EU,
Low Voltage Directive 2014/ 35/ EU