10
G
HYGRASGARD
®
RPFF - SD (± 2,0 %)
SD = Rev. 2020 - V23
The calibratable pendulum room humidity sensor
HYGR
ASGARD
®
RPFF - SD
with plastic sinter filter measures the relative humidity of air. It converts
the measurand humidity into a standard signal of 4...20 mA. Relative humidity (in % r. H.) is the quotient of water vapour partial pressure divided by
the saturation vapour pressure at the respective gas temperature.
The sensor applied in non-aggressive dust-free atmospheres in refrigeration, air conditioning, ventilation and clean room technology, hotels, technical
rooms, meeting rooms and convention centres. These measuring transducers are designed for precise detection of humidity. A digital long-term
stable sensor is used as a measuring element for humidity measurement. This sensor is suitable for duct installation, as a pendulum sensor, or for
integration in equipment.
TECHNICAL DATA
Power supply:
15...36 V DC
depending on working resistance, residual ripple stabilised ± 0.3 V
Working resistance:
R
a
(Ohm) = (U
b
-14 V) ⁄ 0.03 A
R
a
< 500 Ohm
Power consumption:
< 1.1 VA ⁄ 24 V DC
Sensors:
digital humidity sensor
small 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, humidity:
0...100 % r. H. (output corresponding to 4...20 mA)
Operating range, humidity:
0...95 % r. H. (without formation of dew)
Deviation, humidity:
typically
± 2.0 %
(20...80 % r. H.) at +25 °C, otherwise ± 3.0 %
Output, humidity:
4...20 mA, see load resistance diagram
Ambient temperature:
storage –25...+50 °C
operation –5...+55 °C
Long-term stability:
± 1 % per year
Electrical connection:
2-wire connection (see connecting diagram), 0.14 - 1.5 mm²
Connection cable:
PVC, LiY Y, 2 x 0.25 mm
2
, KL = approx. 1.5 m (other lengths optional)
Protective tube:
stainless steel V2A
(1.4301)
,
Ø =16 mm, NL = 142 mm
Protection class:
III (according to EN 60 730)
Protection type:
IP 65
(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
2-wire
RPFF - SD - I
connection
(Transmitter)
Load resistance diagram
RPFF - SD
4...20 mA
Output humidity
in % r.H. 4-20mA
+UB 24V DC
brown
white
500
400
300
200
100
50
10
15
20
25
30 35 36 40
Load resistance diagram
W
orking r
esis
tanc
e (Ohm)
Operating voltage (V DC)
Admissible
range
500
400
300
200
100
50
10
15
20
25
30 35 36 40
Load resistance diagram
W
orking r
esis
tanc
e (Ohm)
Operating voltage (V DC)
Admissible
range
