Pendulum room humidity and temperature sensors HYGRASGARD® RPFTF - Modbus - T3

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Product group: WG01
Pendulum room humidity and temperature sensors HYGRASGARD® RPFTF - Modbus - T3
Calibratable HYGRASGARD® RPFTF - Modbus - T3 (± 2.0%) or RPFTF - 20 - Modbus - T3 room pendulum humidity and temperature measuring transducers (±2.0% or ±1.8%, respectively) with Modbus connection, in an impact resistant plastic housing with quick-locking screws, optionally with/without display, cable sensor with stainless steel pendulum and plastic sinter filter (exchangeable).

The transmitters are used to detect various parametres in humidity measuring. Measurands include relative humidity (0...100% r.H.) and ambient air temperature (– 35...+80 °C). These measurands are used for internal calculation of the following parametres, which can be retrieved via Modbus: relative humidity [% r.H.], absolute humidity [g/m³], mixture ratio [g/kg], dew point temperature [°C], enthalpy [kJ/kg] (ignoring atmospheric air pressure) and ambient temperature [°C]. A long-term stable, digital sensor guarantees precise measuring results.

The pendulum sensor device is applied in non-aggressive, dust-free environments and is suitable for installation in ceilings, ducts and devices. It is used in refrigeration, air conditioning and cleanroom engineering, engineering rooms, hotels and conference facilities.
Innovative Modbus sensor with galvanically separated RS485 interface, selectable bus termination resistance, DIP switches for setting the bus parametres and bus address in current-free state, LEDs for telegram status display, two separate push-in terminals and a large back-lit three-line display with customised programming in the 7-segment and dot-matrix ranges. The sensor is factory-calibrated and can be fine-tuned to ambient conditions by an expert.
Technical details
Voltage supply
24 V AC (± 20 %) and
15…36 V DC
Power consumption
< 1.2 W/ 24 V DC; < 1.8 VA/ 24 V AC
Data points
Temperature [°C], relative humidity [% r. h.],
dew point [°C], absolute humidity [g/ m3],
mixture ratio [g/ kg], enthalpy [kJ/ kg]
Temperature deviation
typically ± 0.2 K at +25 °C
digital humidity sensor
with integrated temperature sensor,
low hysteresis, high long-term stability
Sensor protection
plastic sinter filter, Ø 16 mm, L = 35 mm, exchangeable
(optional metal sinter filter, Ø 16 mm, L = 32 mm)
Measuring range
0...100 % r.H. (humidity)
– 35...+80 °C (temperature)
Zero point offset
± 10 % r.H. (humidity)
± 5 °C (temperature)
Ambient temperature
–30...+70 °C
clean air and
non-aggressive, non-combustible gases
Bus protocol
Modbus (RTU mode),
address range 0...247 selectable
Signal filtering
4 s / 32 s
Protective tube
stainless steelV2A (1.4301), Ø = 16 mm, L = 142 mm
Electrical connection
0.2 - 1.5 mm², via push-in terminal
Cable connection
cable gland, plastic
(2x M 20 x 1.5; with strain relief, exchangeable,
inner diameter 8 - 13 mm) or
M12 connector according to DIN EN 61076-2-101
(optional on request)
Cable gland
2x M 20 x 1.5; with strain relief, exchangeable,
inner diameter 8 - 13 mm
sensor cable
PVC, LiYY, 6 x 0.14 mm²,
KL = approx. 2 m (other lengths optional)
Permissible air humidity
< 95 % r. H., non-precipitating air
Protection class
III (according to EN 60 730)
Protection type
IP 65 (according to EN 60 529)*
CE conformity,
electromagnetic compatibility according to EN 61326,
according to EMC Directive 2014/ 30/ EU