10
G
HYGRASGARD
®
RFF ⁄ RFTF
Rev. 2021 - V23
The calibratable room humidity and temperature sensor
HYGRASGARD
®
RFF ⁄ RFTF
measures the relative humidity and ⁄ or temperature of air. It
converts the measurands humidity and temperature into standard signals of 0 -10 V or 4...20 mA and is available with or without an optional display
(for displaying actual humidity and actual temperature) in an elegant housing made of plastic, with snap-on lid, base with 4-hole attachment for
installation on vertically or horizontally installed in-wall flush boxes, with predetermined breaking point for on-wall cable entry. The relative humidity
(in % r.H.) is the quotient of water vapour partial pressure divided by the saturation vapour pressure at the respective gas temperature.
It is used in non-aggressive dust-free atmospheres in refrigeration, air conditioning, ventilation and clean room technology, in interior rooms such as
residential rooms, offices, hotels, technical rooms, meeting rooms and convention centres. These measuring transducers are designed for exact
detection of air temperature and humidity. A digital long-term stable sensor is used as a measuring element for humidity and temperature measurement.
Fine adjustment by the user is possible.
TECHNICAL DATA
Power supply:
24 V AC (± 20 %) and 15...36 V DC for U variant
15...36 V DC for I variant, depending on working resistance,
residual ripple stabilised ± 0.3 V
Working resistance:
R
a
(ohm) = (U
b
-14 V) ⁄ 0.02 A for I variant
Load resistance:
R
L
> 5 kOhm for U variant
Power consumption:
< 1.1 VA ⁄ 24 V DC ;
< 2.2 VA ⁄ 24 V AC
Sensors:
digital humidity sensor
with integrated temperature sensor,
small hysteresis, high long-term stability
HUMIDITY
Measuring range, humidity:
0...100 % r. H.
(output corresponding to 0 -10 V or 4...20 mA)
Operating range, humidity:
0 … 95 % r. H. (non-precipitating air)
Deviation, humidity:
typically
± 2.0 %
(20...80 % r. H.) at +25 °C, otherwise ± 3.0 %
Output, humidity:
0 -10 V for U variant
4...20 mA for I variant, working resistance < 800 Ω,
see load resistance diagram
TEMPERATURE
Measuring range,
0...+ 50 °C
temperature:
(output corresponding to 0 -10 V or 4... 20 mA or Ohm value)
others upon request!
Operating range,
temperature:
0...+ 50 °C
Deviation, temperature:
typically ± 0.2 K at +25 °C
Output, temperature:
0 -10 V or 4 … 20 mA or Ohm value
Ambient temperature:
storage –25...+50 °C,
operation –5...+55 °C
Electrical connection:
2-, 3- or 4-wire connection (see connecting diagram)
0.14 -1.5 mm ² via terminal screws
Housing:
plastic, material ABS,
colour pure white (similar to RAL 9010)
Housing dimensions:
85 x 85 x 27 mm (Baldur 1)
Installation:
wall mounting or on in-wall flush box, Ø 55 mm,
base with 4-hole for mounting on vertically or
horizontally installed in-wall flush boxes for cable entry from the back,
with predetermined breaking point for on-wall cable entry
from top ⁄ bottom in case of plain on-wall installation
Long-term stability:
±1 % per year
Protection class:
III (according to EN 60 730)
Protection type:
IP 30
(according to EN 60 529)
Standards:
CE conformity, according to EMC directive 2014 ⁄ 30 ⁄ EU,
according to EN 61326-1, according to EN 61326-2-3
Optional:
two-line display with illumination, 36 x15 mm (W x H),
for displaying ACTUAL temperature and ⁄ or ACTUAL humidity
