Room humidity, temperature and PM sensor RFTM-PS Modbus
temperature Fine dust particulate
temperature Temperature
temperature Luftfeuchtigkeit

Room humidity, temperature and PM sensor AERASGARD® RFTM-PS Modbus

Product group: WG02

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382,69 €
455,40 € incl. VAT + shipping


Room humidity, temperature and PM sensor AERASGARD® RFTM-PS 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

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, fine dust (PM)
Operating range, humidity
0...95 % RH (without dew formation)
Deviation of humidity
typical ± 2 % RH (20…80 % RH ); at + 25 °C, otherwise ± 3 %
Operating range, temperature
0...+50 °C
Temperature deviation
typically ± 0.2 K at +25 °C
Service life
> 60 months (under normal load conditions)
depending on the type of loading and gas concentration
Ambient conditions
0...+50 °C
Warm up time
approx. 1 hour
Response time
< 2 minutes
Measuring range
0...50 / 0...100 / 0...300 / 0...500 μg/m³
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