Room air quality sensor / room CO2 and air quality sensor RLQ-CO2-W LCD
temperature VOC
temperature CO2

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

Item no. 1501-61B1-7321-200
EAN 4251325613260
Product group: WG02

In Stock

Usually ships in 1 to 3 days
449,91 €
174,00 € (special net price)
207,06 € incl. VAT + shipping


Room air quality sensor / room CO2 and air quality sensor AERASGARD® RLQ-CO2
Maintenance-free AERASGARD® RLQ - CO2 - W room air quality measuring transducer with active/switching output, automatic calibration (can be deactivated), in an elegant plastic housing with snap-on cover, optionally with/without display, for determining the CO2 content of the air (0...2000 ppm/0...5000 ppm), the quality in three VOC sensitivity levels (low/medium/high), the temperature (0...+50°C) as well as the 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).

The sensor device 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.
The CO2 content is measured 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.
The 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
< 4.4 W/ 24 V DC typical; < 6.4 VA/ 24 V AC typical;
peak current 200 mA
Data points
Air quality (VOC), carbon dioxide (CO2)
Deviation of humidity
typical ± 2 % RH (20…80 % RH ); at + 25 °C, otherwise ± 3 %
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
0...2000 ppm or 0...5000 ppm (selectable via DIP switches)
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)
Warm up time
approx. 1 hour
Response time
< 2 minutes
0 -10 V or 4...20 mA (selectable via DIP switches,
selected variant applies for all outputs), working resistance < 800 Ω
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)
Measuring range
0...100 % air quality; with reference to calibration gas
Measuring ranges
0...2000 ppm / 0...5000 ppm
0...100 % Air quality - VOC sensitivities (low/medium/high)
Ambient temperature
0...+50 °C
Electrical connection
0.14 - 1.5 mm² via terminal screws
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)
Protection type housing
IP 30
CE conformity, electromagnetic compatibility
according to EN 61 326, EMC Directive 2014/ 30/ EU,
Low Voltage Directive 2014/ 35/ EU
display with illumination, two line, cutout approx. 36 x 15 mm
(W x H), for displaying actual humidity, actual temperature,
air quality and / or the actual CO2 content