Data Sheet for Product

2
Siemens
Datasheet
A6V11600411_en
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_a
Smart Infrastructure 2019-08-07
Use
QFA2068, QFA2068D and QFA2079 are used in ventilating and air conditioning plants to
acquire room
● relative humidity and
● temperature
In various places, the sensor is used as a
● control sensor and
● measuring sensor for building automation and control systems or indicating units.
Example:
● Offices, hospitals, storage rooms, and so on
Type summary
Type
referenc
e
SSN NO. Temperature
measuring range
Temperature
signal output
Humidity
measuring
range
Humidity
signal output
Operating voltage
QFA206
8
S55720-
S462
0...50 °C / -
35...+35 °C /
-40…+70 °C
active,
DC 0...10 V
0...100 % active,
DC 0...10 V
AC 24 V or
DC 13.5…35 V
QFA206
8D
S55720-
S463
QFA207
9
S55720-
S464
0...50 °C / -
35...+35 °C /
-40…+70 °C
active,
4…20 mA
0...100 % active,
4…20 mA
DC 13.5…35 V
Ordering and delivery
When ordering, please give name and type reference, e.g.:Room sensor QFA2068D.
Equi
pment combinations
All systems or devices capable of acquiring and handling the sensor’s DC 0...10 V,
4…20 mA output signal.
When using the sensors for minimum or maximum selection, for averaging, or to calculate
enthalpy, enthalpy difference, absolute humidity, and dew point, we recommend to use the
SEZ220 signal converter (see datasheet N5146).
Mechanical design
The room sensors have been designed for wall mounting. They are suitable for use with
most commercially available recessed conduit boxes. The cables need to be introduced from
the rear (concealed wiring).
The two-part housing comprises a casing and a baseplate. Both snap together but can be
detached again.
The measuring circuit, the sensing elements and the setting element are located on the
printed circuit board inside the casing.
The baseplate carries the connecting terminals.
Measured value display
The type QFA2068D provides the measured values on its LCD display. The following
measured values are displayed alternately in intervals of 5 s:
● Temperature: in °C or °F
● Humidity: in % r.h.