Fine dust particulate

room sensor for humidity, temperature, fine dust (PM), air quality (VOC) and CO2 AERASGARD® RFTM-PS-LQ-CO2 Modbus

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Product group: WG02
room sensor for humidity, temperature, fine dust (PM), air quality (VOC) and CO2 AERASGARD® RFTM-PS-LQ-CO2 Modbus
Multifunctional AERASGARD® RFTM - LQ - PS - CO2 Modbus
indoor climate measuring transducer (maximum expansion level) with Modbus connection, in an elegant plastic housing with snap-on cover, base with 4-hole attachment, optionally with/without display. As RFTM - CO2 Modbus version also available with/without optional setpoint potentiometer.

The room climate transmitter serves to detect air humidity (0...100% r.H.), temperature (0...+50°C), air quality (0…100% VOC), particulate matter (PM) (0...1000 g/m) and CO2 content (0...5000 ppm). It can also be used as a room control unit (% setpoint) and provides effective monitoring and control of the entire indoor climate with one single device. This enables energy-saving room ventilation on an as-needed basis, thereby reducing operating costs and improving well-being. Applications are found in offices, hotels, convention centres, apartments, shops, etc.
A long-term stable, digital humidity and temperature sensor 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).
An optical particulate sensor precisely detects particulate matter (PM) of size categories 0.3 to 10 micrometres. The sensor device is factory-calibrated and can be fine-tuned to ambient conditions by an expert.
Modbus measuring transducer with galvanically separated RS485 interface, selectable bus termination resistance, DIP switches for setting the bus parametres and bus address in the currentless state, LEDs for telegram status display and back-lit two-line display with customised programming in the 7-segment and dot-matrix ranges.
Technical details
Long-term stability (PM)
± 1.25 g/m3 (± 1.25 % of measured value/year)
Measuring accuracy (PM)
typically ± 10 g/m3 (± 10 % of measured value) at PM 2.5
typically ± 25 g/m3 (± 25 % of measured value) at PM 10
Measuring range (PM)
0... 50 g/m³ 0...100 g/m³ 0...300 g/m³ 0...500 g/m³
Particle size (PM)
PM 2,5 (0,3...2,5 m); PM 10 (0,3...10 m)
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 [°C], relative humidity [% r.H.], air quality (VOC) [%,ppb], fine dust (PM) [g/m3], carbon dioxide (CO2) [ppm], setpoint potentiometer [%]
Measuring range, humidity
0...100 % r. H.
Operating range, humidity
0...95 % r. H. (without dew formation)
Deviation of humidity
typical ± 2 % r. H. (20…80 % r. H. ); at + 25 °C, otherwise ± 3 %
Measuring range, temperature
0...+ 50 °C (output equivalent to 0 -10 V or 4...20 mA)
Operating range, temperature
0...+50 °C
Temperature deviation
typically ± 0.2 K at +25 °C
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
Ambient conditions
0...+50 °C
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)
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
Bus protocol
Modbus (RTU mode),
address range 0...247 selectable
Signal filtering
4 s / 32 s
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)
CE conformity, electromagnetic compatibility
according to EN 61 326, EMC Directive 2014/ 30/ EU,
Low Voltage Directive 2014/ 35/ EU