Room humidity and temperature sensor HYGRASGARD® RFTF - Modbus

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Product group: WG01
Room humidity and temperature sensor HYGRASGARD® RFTF - Modbus
Quality product for the HVAC sector, accuracy ±2%
The transmitter serves to measure the relative humidity and the temperature of the room air. These measurands are used to calculate various parametres internally. The Modbus device can be used to retrieve the following parametres: relative humidity [% r.H.], absolute humidity [g/m³], mixture ratio [g/kg], dew-point temperature [°C], enthalpy [kJ/kg] (ignoring atmospheric air pressure) and room temperature [°C].
Technical details
Voltage supply
24 V AC (± 20 %) and
15…36 V DC
Power consumption
< 1,0 VA/ 24 V DC
< 2,2 VA/ 24 V AC
Data points
Temperature, relative humidity, absolute humidity,
dew point, mixture ratio, enthalpy
and setpoint potentiometer,
rotary switch and presence button
Deviation of humidity
typical ± 2.0 % r. H. (20…80 % r. H. ); at + 25 °C, otherwise ± 3.0 % r. H.
Temperature deviation
typically ± 0.2 K at +25 °C
digital humidity sensor
with integrated temperature sensor,
low hysteresis, high long-term stability
Measuring range
0...100 % r.H. (humidity)
0...+ 50 °C (temperature)
Zero point offset
± 10 % r.H. (humidity)
± 10 °C (temperature)
adjustable using potentiometer
Ambient temperature
storage –35...+85 °C;
operation 0...+50 °C
clean air and
non-aggressive, non-combustible gases
Signal filtering
4 s / 32 s
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
± 1 %/ year
Permissible air humidity
< 95 % r. H., non-precipitating air
Protection class
III (according to EN 60 730)
Protection type
IP 30 (according to EN 60 529)
CE conformity
according to EMC Directive 2014/ 30/ EU,
according to EN 61 326