QFA31…
QFA31..D
1859P04
1859P02
1858P02
1858P01
1
QFA31… with AQF3100
858
AQF3150
AQF3153
Symaro™
Room sensors
QFA31…
for relative humidity (high accuracy) and temperature
•
•
•
•
•
•
Operating voltage AC 24 V / DC 13.5...35 V
Signal output DC 0...10 V / 4…20 mA for r. h. and temperature
Very high measuring accuracy across the entire measuring range
Capacitive humidity measurement
Function test
Range of use −40…+70 °C / 0…100 % r. h.
with LCD display -25…+70 °C / 0…100 % r. h.
Use
The QFA31… is for use in ventilation and air conditioning plants where high accuracy
and short response times for measuring relative humidity are required. The measuring
range covers the entire humidity range of 0…100 %.
Examples:
• Storage and production facilities in the paper, textile, pharmaceutical, food, chemical
and electronics industry, etc.
• Laboratories
• Hospitals
• Indoor swimming-pools
• Computer and EDP centers
• Greenhouses
• With the AQF3100 accessory for outdoor use
CE1N1858en
11.03.2008
Building Technologies
Type summary
Type
reference
Temperature
measuring range
Temperature
signal output
Humidity
measuring range
None
None
0...100 %
QFA3100
Humidity
signal output
Operating
voltage
Measured
value display
aktiv, DC 0...10 V
AC 24 V or
DC 13,5…35 V
No
QFA3101
None
None
0...100 %
aktive, 4…20 mA
DC 13,5…35 V
No
QFA3160
0...50 °C / − 40…+70
°C / − 35...+ 3 5 °C
aktive, DC 0...10 V
0...100 %
aktive, DC 0...10 V
AC 24 V or
DC 13,5…35 V
No
QFA3160D
0...50 °C / − 40…+70
°C / − 35...+ 3 5 °C
aktive, DC 0...10 V
0...100 %
aktive, DC 0...10 V
AC 24 V or
DC 13,5…35 V
Yes
QFA3171
0...50 °C / − 40…+70
°C / − 35...+ 3 5 °C
aktive, 4…20 mA
0...100 %
aktive, 4…20 mA
DC 13,5…35 V
No
QFA3171D
0...50 °C / − 40…+70
°C / − 35...+ 3 5 °C
aktive, 4…20 mA
0...100 %
aktive, 4…20 mA
DC 13,5…35 V
Yes
Ordering
When ordering, please give name and type reference, e.g.:
Room sensor QFA3160
The AQF3100 outdoor mounting and the service set AQF3153 are listed under “Accessories“ and must be ordered as a separate item.
Equipment combinations
The QFA31… is for use with all types of systems and devices that can acquire and
handle the sensor’s DC 0...10 V or 4…20 mA output signal.
Technical design
The sensor acquires relative humidity via its capacitive sensing element whose capacitance varies as a function of the relative humidity of the ambient air.
An electronic circuit converts the sensor’s signal to a continuous DC 0...10 V or
4…20 mA signal, corresponding to a relative humidity of 0...100 %.
Temperature
The sensor acquires the temperature via its sensing element whose electrical resistance varies according to the temperature of the ambient air.
This variation is converted to an active DC 0...10 V or 4…20 mA output signal, corresponding to a temperature range of 0...50 °C, − 35...+35 °C, or −40...+70 °C.
The measuring range can be selected.
Burden diagram
Output signal, terminaI I1 / I2
1858D02en
Relative humidity
900
Burden [Ohm]
800
Inadmissible
range!
700
600
Admissible
range
500
400
300
200
100
0
0
10
20
Operating voltage
30
40
[DC V]
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Siemens
Building Technologies
Room sensors QFA31…
CE1N1858en
11.03.2008
Mechanical design
Room sensor QFA31…
The room sensor consists of housing, printed circuit board, connection terminals and
measuring tip. The housing consists of 2 parts: Base and removable cover (screwed).
A rubber seal is installed between housing and cover in order to satisfy the requirements of IP 65 degree of protection.
The measuring circuit and the setting element are accommodated on the printed circuit
board inside the cover, the connection terminals in the base. Housing and measuring
tip are screwed together. The measuring tip features a degree of protection of IP40.
The sensing elements are located at the end of the measuring tip, protected by a
screw-on filter cap.
The M16 cable entry gland supplied with the sensor can be screwed into the bottom of
the base. If the sensor is used outdoors, that opening must be closed off and the prepared hole on the opposite side of the base knocked out.
Measured value display
The types QFA3160D and QFA3171D with LCD display shows the following values:
Setting elements
in °C or °F
in %
Measuring range
123
Range
1 2 3
°F
°C
Test function active
U1
QFA31...D
°F
°C
I1
I2
5 V 20 mA
12 mA
5 V 10 V 12 mA
20 mA
0V
5V
4 mA
12 mA
5V
0 V 12 mA
4 mA
10 V
Display
temperature unit
U2
1858Z03en
Temperature:
Humidity:
The setting elements are located inside the cover. A setting element is consisting of 6
pins and a shorting plug. It is used for selecting the required temperature measuring
range and for activating the test function. Types with LCD display have a second setting element with 4 pins and a shorting plug.
The different shorting plug positions have the following meaning:
• For the active temperature measuring range:
Shorting plug in the left position (R1) = − 35...+ 35 °C,
Shorting plug in the mid position (R2) = 0...50 °C (factory setting)
Shorting plug in the right position (R3) = −40...+70 °C
• For the active test function:
Shorting plug in the horizontal position: The values available at the signal output are
those given in the table “Test function active“
For the measured value display (QFA31…D)
- Shorting plug vertical in the right position =
- Shorting plug vertical in the left position
=
°C (factory setting)
°F
Behavior in the
event of fault
• If the temperature sensor is faulty, the voltage at signal output U2 (I2) is 0 V (4 mA)
after 60 seconds, the humidity signal at signal output U1 (I1) increases to 10 V
(20 mA)
• If the humidity sensor is faulty, the voltage at signal output U1 (I1) is 10 V (20 mA)
after 60 seconds; the temperature signal remains active
Outdoor mounting
kit AQF3100
The outdoor mounting kit consists of:
• 1 wall mounting bracket complete with radiation shield
• 4 Phillips-head screws K35 x 1 2
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Siemens
Building Technologies
Room sensors QFA31…
CE1N1858en
11.03.2008
• 1 grommet M 16 x 1.5 with O-ring and nut M 16 x 1.5 for closing off the sensor’s cable entry hole if not required
Service set
AQF3153
The service set comprises three measuring tips without sensor element. Each tip signals a predefined temperature and humidity value to the basic unit:
• 85%, 40 °C
• 50%, 23 °C
• 20%, 5 °C
The fixed values are available at the signal outputs. The accuracy is the same as for
the test function. The measuring tips can be exchanged in operation.
Accessories
Name
Outdoor mounting kit (incl. radiation shield)
Filter cap (for replacement)
Measuring tip (exchangeable for replacement)
Service set (for function test)
Type reference
AQF3100
AQF3101
AQF3150
AQF3153
Engineering notes
Use a safety extra low-voltage (SELV) transformer with separate windings designed for
100 % duty. All safety regulations valid at the location of the plant must be observed
when sizing and protecting the transformer.
When sizing the transformer, the sensor’s power consumption must be taken into consideration.
For the electrical connection of the sensor, refer to the Data Sheets of the devices with
which the sensor is used.
The maximum permissible cable lengths must be observed.
Cable routing
and cable selection
For cable routing, it should always be considered that electrical interference is the greater, the longer the cables run parallel and the smaller the distance between them. Use
shielded cables if necessary.
Twisted pairs of cables are required for the secondary supply lines and the signal lines.
Note to QFA3171(D)
Terminals G1(+) and I1 (−) for the humidity output must always be connected to power,
even if only the temperature output G2 (+) and I2 (−) is used!
Mounting notes
Interior mounting
QFA31… without AQF3100
Mounting location
Inside wall (not on outside wall!) of the room to be air conditioned; not in recesses,
shelves, behind curtains, above or close to heat sources; not on walls behind which a
chimney is located.
The sensor must not be exposed to direct solar radiation.
Install the sensor in the occupied space about 1.5 m above the floor and at least 50 cm
from the next wall.
Caution!
• The seal between housing and cover must not be removed, or else degree of protection IP 65 will be no longer ensured.
• The sensing elements inside the measuring tip are sensitive to shock and impact.
Avoid any such impact on mounting.
Mounting position
Without using the AQF3100 outdoor mounting kit, the sensor must not be mounted with
the measuring tip pointing upward.
Mounting Instructions
Mounting Instructions are printed on the sensor’s packaging.
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Siemens
Building Technologies
Room sensors QFA31…
CE1N1858en
11.03.2008
Outdoor mounting
QFA31… with AQF3100
Mounting location
Exterior wall, preferably on the North or Northwestern side of the building; if possible in
the middle of the wall, at least 2.5 above the ground.
Not above or below windows, above doors and ventilation shafts, below balconies or
eaves.
Mounting position
The sensor with AQF3100 must be mounted in a vertical position (radiation shield at
the top).
Mounting Instructions
Mounting Instructions are enclosed with the AQF3100.
Note
When using the AQF3100 outdoor mounting kit, the sensor’s cable entry hole must be
closed off with the grommet and the prepared M16 cable entry on the opposite side
knocked out.
Commissioning notes
Prior to switching on power, check wiring.
On the sensor, select the required temperature measuring range.
Technical data
Power supply
Operating voltage
AC 24 V ± 20 % or DC 13.5...35 V
Frequency
50 / 60 Hz at AC 24 V
Power consumption
≤ 1 VA
Cable lengths for the measuring
signal
Max. perm. cable lengths
refer to Data Sheet of the device handling the
signal
Functional data
“Humidity sensor"
Measuring range
0...100 % r. h.
Measuring accuracy at 23 °C and AC 24 V
0...100 % r.h.
±2 %
Temperature dependency
≤ 0 . 0 5 % r.h. / ° C
Functional data
"Temperature sensor"
Degree of protection
Time constant
< 20 s
Output signal, linear (terminal U1)
DC 0...10 V
max. ± 1 mA
Output signal, linear (terminal I1)
Burden
4…20 mA 0...100 % r.h.
refer to "Function"
Measuring range
0...50 °C (R2 = factory setting),
− 35...+ 35 °C (R1), − 40...+70 °C (R3)
Sensing element
Pt 1000 class B to DIN EN 60 751
Measuring accuracy at AC 24 V in the range of
15...35 °C
− 35...+70 °C
± 0.6 K
± 0.8 K
Time constant
8.5 min. (according to airflow and
wall coupling)
Output signal, linear (terminal U2)
DC 0...10 V
max. ± 1 mA
Output signal, linear (terminal I2)
Burden
4..20 mA 0...50/− 35...+ 35/− 40...+70 °C
refer to "Function"
Housing degree of protection to
IEC 60 529
Base unit
IP65
measuring tip
IP40
Unit with outdoor mounting kit
Electrical connections
Environmental
conditions
0...100 % r.h.
0...50/− 35...+ 35/− 40...+70 °C
IP65
Safety class
III to EN 60 730
Screw terminals
1 × 2.5 mm or 2 × 1.5 mm
Cable entry gland (enclosed)
M 16 x 1.5
Operation to
Climatic conditions
Temperature (housing with electronics)
LCD-display readable
Humidity
Mechanical conditions
class 4K2 to IEC 60 721-3-4
− 40...+ 70 °C
− 25...+ 70 °C
0...100 % r.h. (with condensation)
class 3M2 to IEC 60 721-3-3
2
2
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Siemens
Building Technologies
Room sensors QFA31…
CE1N1858en
11.03.2008
Transport to
Climatic condition
Temperature
Humidity
Mechanical conditions
Materials and color
Standards
Base
polycarbonate, RAL 7001 (silver-grey)
Housing cover
polycarbonate, RAL 7035 (light-grey)
measuring tip
polycarbonate, RAL 7001 (silver-grey)
Filter cap
polycarbonate, RAL 7001 (silver-grey)
Mounting bracket
PA, RAL 7035 (light-grey)
Sensor (entirely)
silicon-free
Packaging
corrugated cardboard
Product safety
Automatic electrical controls for household and similar
EN 60 730-1
use
Electromagnetic compatibility
Immunity
Emissions
conformity to
Weight
IEC 60 721-3-2
class 2K3
− 40...+ 70 °C
< 95 % r.h.
class 2M2
EN 61 000-6-1
EN 61 000-6-3
EMC directive 2004/108/EC
conformity to
Australian EMC framework
Radio Interference Emission Standard
Radio Communication Act 1992
AS / NZS 3548
-Konformität
UL 873
Incl. packaging
Without LCD-display
0.152 kg
With LCD-display
0.175 kg
AQF3150
0.050 kg
AQF3153
0.066 kg
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Siemens
Building Technologies
Room sensors QFA31…
CE1N1858en
11.03.2008
Connection terminals
G1
U1
G0
G, G0
G1, G2
U1
U2
I1
I2
G
(r.h.)
I1
1858G05
(r.h.)
1858G04
G
QFA3160(D)
(r.h.)
G2
G1
(R1 = −35...+35 °C /
R2 = 0...50 °C /
R3 = −40...+70 °C)
U1
G0
QFA3171(D)
U2
(R1 = −35...+35 °C /
R2 = 0...50 °C /
R3 = −40...+70 °C)
(r.h.)
I1
1858G03
QFA3101
1858G01
QFA3100
I2
Operating voltage AC 24 V (SELV) or DC 13.5...35 V
Operating voltage DC 13.5...35 V
Signal output DC 0...10 V for relative humidity 0...100 %
Signal output DC 0...10 V for temperature range 0...50 °C / − 40…+70 °C / − 35...+ 35 °C
Signal output 4…20 mA for relative humidity 0...100 %
Signal output 4…20 mA for temperature range 0...50 °C / − 40…+70 °C / − 35...+ 35 °C
Note on connection terminals of the QFA3171(D):
Terminals G1(+) and I1 (−) for the humidity output must always be connected to power, even if only the temperature output G2 (+) and I2 (−) is used!
Dimensions (all dimensions in mm)
(41 with display)
QFA31…(D)
Dimensioning without
(with) LCD-display
62,8
39
1858M01
28
60
41
80
84
M 16 x 1,5
Bohrplan
AQF3150
10,5
14,5
ø 15
QFA31… with AQF3100
40
49
104
89
66
135
10,7
44
36
58
30
36
44
193
5,3
22
28
1858M02
50
66
M 16 x 1,5
Drilling plan
© 2006 – 2008 Siemens Switzerland Ltd.
Siemens
Building Technologies
Room sensors QFA31…
Subject to change
7/7
CE1N1858en
11.03.2008