Data Sheet for Product

Function
The sensor acquires the room temperature via its sensing element whose resistance
value changes as a function of the temperature.
This change is converted to a DC 0...10 V or 4...20 mA output signal, depending on the
type of sensor. The output signal corresponds to the selected temperature range.
Output signal, terminal I1
0 10 20 30 40
700
400
300
800
900
600
500
100
0
200
Burden [Ohm]
[DC V]
Operating voltage
Admissible
range
Inadmissible
range!
1749D02en
Mechanical design
The units have been designed for wall mounting. They are suitable for use with most
commercially available recessed conduit boxes. The cables can be introduced from the
rear (concealed wiring) or from below or above (surface-run wires) through knock-out
openings.
The units consist of two major sections: Casing and baseplate. Both snap together but
can be detached again.
The measuring circuit, the sensing element and the setting element are located on the
printed circuit board inside the casing.
The baseplate carries the connecting terminals.
Mechanical design is similar to QAA20.1.. with additional LC-Display. Display of room
temperature in °C or °F
R1
12 mA
4 mA
12 mA
20 mA
5 V
0 V
5 V
10 V
U1 I1
R1
R2
R3
R2
R3
°C
°F
°C
°F
1 3 2 4
Measuring range
Test function active
1749Z01en
QAA2061D
Display of room
temperature
The setting element is accessible after removing the baseplate.
It consists of 6 pins and a shorting plug. It is used to select the required measuring
range and to activate the test function.
The different plug positions have the following meaning
• For the active temperature measuring range:
Shorting plug in the upper position (R1) = − 35...+ 35 °C,
Burden diagram
QAA20..1
QAA2061D
Setting element
2/6
Siemens Room temperature sensors QAA20..1.. CE1N1749en
Building Technologies 2014-07-30