RFTM-LQ-PS-CO2-Modbus| S+S Regeltechnik -Order online!
temperature Luftfeuchtigkeit
temperature Fine dust particulate
temperature VOC
temperature CO2
temperature Temperature

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

Product group: WG02

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580,02 €
690,22 € incl. VAT + shipping


room sensor for humidity, temperature, fine dust (PM), air quality (VOC) and CO2 AERASGARD® RFTM-PS-LQ-CO2 Modbus
Multifunctional indoor climate sensor AERASGARD® RFTM - LQ - PS - CO2 - Modbus (maximum expansion level) with Modbus connection, in an elegant plastic housing with snap-on lid, base with 4-hole attachment, optionally with / without display, type variant RFTM - CO2 - Modbus optionally with / without setpoint potentiometer. The room sensor is used for detecting the air humidity (0…100 % RH), room temperature (0...+50 °C), air quality (VOC) (0…100 %), the fine dust (PM) (0...1000 µg/m3) and CO2 content (0...5000 ppm) as well as a room control unit (% setpoint). International system of units SI (default) can be changed to imperial (via Modbus). The following parameters can be accessed via the Modbus: Temperature, relative humidity, air quality (VOC), fine dust (PM) and carbon dioxide (CO2). Use just one device to monitor and control the entire indoor climate effectively. This enables energy-saving room ventilation on an as-needed basis, thereby reducing operating costs and improving well-being. It is used in offices, hotels, convention centres, apartments, shops, etc. One sensor for every 30 m² of room area is recommended.

A long-term stable, digital humidity and temperature sensor guarantees exact measurement results. The air quality is determined based on 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 fine dust sensor precisely detects particulate (PM) of the size category 0.3 to 10 micrometres.
Innovative Modbus sensor with galvanically separated RS485-Modbus-interface, selectable bus termination resistance, DIP switch for setting the bus parameters and bus address in current-free state, internal LEDs for telegram status display, two separate push-in terminals and two-line display (illuminated; with customised programming in the 7-segment and dot-matrix range). The sensor is factory-calibrated; an environmental precision adjustment by an expert is possible.

Technical details

Long-term stability (PM)
± 1.25 μg/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 μg/m³ 0...100 μg/m³ 0...300 μg/m³ 0...500 μg/m³
Particle size (PM)
PM 2,5 (0,3...2,5 μm); PM 10 (0,3...10 μm)
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), particulate matter (PM), carbon dioxide (CO2)
Measuring range, humidity
0...100 % RH
Operating range, humidity
0...95 % RH (without dew formation)
Deviation of humidity
typical ± 2 % RH (20…80 % RH ); 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...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)
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
Measuring range
0...5000 ppm
Measuring ranges
0...50 / 0...100 / 0...300 / 0...500 μg/m³
0...100 % Air quality - VOC sensitivities (low/medium/high)
0...5000 ppm
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)
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
switchable metric / imperial