HYGRASGARD® 4100 Series
RFF ⁄ RFTF
Room humidity and temperature sensors, on-wall, calibrateable,
with active ⁄ passive output, series Frija II
Quality product for HVAC sector, accuracy 3 % r. H.
The calibrateable 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 optional available with or without display (for dis-
playing actual humidity and actual temperature) in an elegant enclosure 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, or in enclosures made of stainless steel
(top and bottom part are of stainless steel, the lid is screwed on), vandalism-secure version e.g. for
schools, military barracks, and public buildings. Relative humidity (in % r.H.) is the quotient of water
vapour partial pressure divided by the saturation vapour pressure at the respective gas temperature.
HYGRASGARD® RFF ⁄ RFTF are applied in non-aggressive dust-free ambiences in refrigeration, air
conditioning, ventilation and clean room technology, in interior rooms such as residential rooms, of-
fices, 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 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 (± 10 %) for U variant
15 … 36 V DC (± 10 %) for I variant (depending on working resistance)
Power consumption: ....................... < 1.1 VA ⁄ 24 V DC ; < 2.2 VA ⁄ 24 V AC
Sensors: ........................................... digital humidity sensor with integrated temperature sensor,
dew-proof, 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. (without formation of dew)
Deviation, humidity: ......................... ± 3 % r. H. (20…80 %) at +20 °C, otherwise ± 5 % r. H.
Output, humidity: ............................. 0 -10 V at U variant 4 … 20 mA at I variant,
working resistance < 800 Ω, see load resistance diagram
TEMPERATURE:
Measuring range, temperature: ... 0 … + 50 °C (output corresponding to 0 -10 V or
4 … 20 mA or Ohm value) others upon request!
Operating range, temperature: .... 0 …+ 50 °C
Deviation, temperature: ................. ± 0.8 K at 20 °C, under standard conditions
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 on circuit board
Enclosure: ........................................ plastic, material ABS,
colour pure white (similar RAL 9010),
stainless steel enclosure optional
Dimensions: ..................................... 98 x 106 x 32 mm (Frija II)
100 x 100 x 25 mm (stainless steel)
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 2004 ⁄ 108 ⁄ EC,
according to EN 61326-1: 2006,
according to EN 61326-2-3: 2006
Optional: ........................................... two-line display with illumination, 36 x15 mm (W x H),
for displaying ACTUAL temperature and ⁄ or ACTUAL humidity
RFF ⁄ RFTF
without display
(Frija II)
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