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Commissioning notes
Technical data
Power supply
Cable lengths for
measuring signal
Functional data of
humidity sensor
Functional data of
temperature sensor with
QFA2060
Functional data of
temperature sensor with
QFA2020, QFA2040
Degree of protection
Electrical connections
4/6
Siemens Building Technologies
HVAC Products
Check wiring before switching on power. The temperature measuring range must be
selected on the sensor, if required.
Wiring and the output signals can be checked by making use of the test function (refer
to "Mechanical design").
We recommend not to use voltmeters or ohmmeters directly at the sensing element. In
the case of the simulated passive output signals, measurements with commercially
available metres cannot be made (measuring current too small).
Operating voltage
Frequency
Power consumption
Perm. cable lengths
Range of use
Measuring range
Measuring accuracy at 23 °C and AC 24 V
0...95 % r.h.
30...70 % r.h.
Temperature dependency
Time constant
Perm. air velocity
Output signal, linear (terminal U1)
Range of use
Measuring range
Sensing element
Measuring accuracy at
15...35 °C
− 35...+50 °C
Time constant
Output signal, linear (terminal U2)
Measuring range
Sensing element simulated, corresponding to
QFA2020
QFA2040 (serie B or higher)
Measuring accuracy at
15...35 °C
− 35...+50 °C
Time constant
Perm. measuring current with
QFA2020
QFA2040
Housing
Safety class
Screw terminals for
Room sensors QFA20...
AC 24 V ± 20 % or DC 13.5...35 V
50 / 60 Hz at AC 24 V
≤ 1 VA
refer to Data Sheet of the device
handling the signal
0...95 % r. h. (non-condensing)
0...100 % r. h.
± 5 %
± 3 %, typically
≤ 0 . 1 % r. h. / ° C
2 min
20 m/s
DC 0...10 V
0...100 % r. h.,
max. ± 1 mA
− 15...+ 50 °C
0...50 °C / − 35...+ 35 °C
NTC 10 kΩ
± 0.8 K
± 1 K
8 min (depending on air movement
and thermal coupling to the wall)
0...50 °C / − 35...+ 35 °C
DC 0...10 V
max. ± 1 mA
0...50 °C
LG-Ni 1000
T1 (PTC)
± 0.8 K
± 1 K
8 min (depending on air movement
and thermal coupling to the wall)
1.18...3.29 mA
0.53...1.46 mA
IP 30 to IEC 529
III to EN 60 730
1 × 2.5 mm
oder 2 × 1.5 mm
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CE1N1857en
06.06.2005
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