Symaro™
Outside Temperature Sensors
? Active sensors for acquiring the outside temperature
? Operating voltage AC 24 V or DC 13.5...35 V
? Signal output DC 0...10 V or 4...20 mA
Use
The QAC31... outside temperature sensors are for use in heating, ventilation and air conditioning plants as:
? Reference sensors for outside temperature-compensated control
? Measuring sensors, e.g. for optimization, measured value indication, or for connection to a building automation and control system
? High-end sensors for acquiring the room temperature in commercial spaces
Type summary

Type reference	Measuring range	Operating voltage	Output signal
QAC3161	-50...+50 °C	AC 24 V+20%/DC 13.5...35 V	DC 0...10 V
QAC3171	-50...+50 °C	DC 13.5...35 V	4...20 mA

Ordering and delivery
When ordering, please give name and type reference, e.g.:
Outside temperature sensor QAC3161.
The sensor is supplied complete with cable entry glａnd M16.
Siemens Building Technologies
HVAC Products

All systems or devices capable of acquiring and handling the sensor's DC 0...10 V or 4...20 mA output signal.

 The sensor acquires the outside 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.

The outside temperature sensor consists of housing, printed circuit board, connection terminals and measuring probe.
The two-sectional housing is comprised of base and removable cover (screwed connection). The measuring circuit and the setting element are located on the printed circuit board inside the cover, the connection terminals on the base.
The measuring probe is screwed into the bottom of the housing.
Cable entry is either from the rear (concealed wiring) or from below (surface-run wires). For that purpose, a hole can be knocked out in the base or the enclosed cable entry glａnd M16 can be screwed into the bottom of the base.

The setting element is located inside the cover. 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 temperature measuring range:
Shorting plug in the left position (R1) = 0...50 °C
Shorting plug in the mid position (R2) = -50...+50 °C (factory setting)
Shorting plug in the right position (R3) = -35...+35 °C
? For activating the test function:
Shorting plug in the horizontal position: The values according to the table "Test function active" will be made available at the signal output.
In the event of fault, the output signal will reach 0 V (4 mA) after 60 seconds.

To power the sensor, a transformer for safety extra low-voltage (SELV) with separate windings for 100 % duty is required. When sizing and electrically protecting the transformer, local safety regulations must be observed.

When sizing the transformer, the power consumption of the outside temperature sensor must be taken into consideration. For correct wiring, refer to the Data Sheets of the devices with which the sensor is used.
The permissible cable lengths must be observed.

When laying the cables, it must be observed that the longer the cables run side by side and the smaller the distance between them, the greater the electrical interference. Twisted pair cables are required for the secondary supply lines and the signal lines.