User Manual

2
Siemens
Datasheet
A6V11610632_en
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_a
Smart Infrastructure 2019-07-12
Use
The duct temperature sensor is used in ventilation and air conditioning plants as:
● Supply or exhaust air temperature sensors
● Limit sensors, for example, for minimum limitation of the supply air temperature
● Reference sensors, for example, for compensation of the room temperature as a function
of the outside temperature
● Dew point temperature sensors
● Measuring sensors, for example, for measured value indication or for connection to a
building automation and control system
Technical design
Cable entry is made via the M16 cable entry gland (IP54) supplied with the sensor which can
be screwed into the housing. Probe and housing are rigidly connected.
The sensor is designed for screwed or flanged mounting.
It can be fitted as follows:
● With the mounting flange supplied with the sensor (recommended), which is to be fitted
to the sensor and then secured according to the required immersion length
● Without the mounting flange (using the maximum immersion length). For that propose,
the housing has 4 holes for fitting the sensor directly to the air duct
Type summary
Product number SSN NO. Probe
length
Measuring
range
Operating voltage Output signal
QAM2151.040/MO S55720-S466 0.4 m -50…50 ℃ AC 24 V ±20 %/
DC 13.5...35 V
Modbus RTU
O
rdering and delivery
When ordering, specify name and product number, for example: Duct temperature sensor
QAM2151.040/MO.
The sensor is supplied complete with mounting flange AQM63.0 and cable entry gland M16.
Notes
Engineering
Powering the sensor requires a transformer for safety extra low-voltage (SELV) with
separate windings for 100 % duty. When sizing and protecting the transformer, comply with
all local safety regulations.
When sizing the transformer, determine the power consumption of the room sensor.
For correct wiring, see the datasheets of the devices with which the sensor is used.
Observe permissible line lengths.
Cable routing and cable selection
Note that when routing cables, the longer the cables run side by side and the smaller the
distance between them, the greater the electrical interference. Shielded cables must be used
in environments with EMC problems.
Twisted pair cables are required for the secondary supply lines and the signal lines.
Mounting and installation
Mounting location
● For supply air temperature control: Downstream from the fan, if the fan is located after
the last air handling unit. Otherwise, after the last air handling unit with a minimum
distance of 0.5 m