Siemens QSA2700D User manual

A6V11396712
Smart Infrastructure
2020-08-17
Fine Dust Room Sensors
QSA2700D/QSA2700/AQS2700
These sensors acquire the PM2.5 and PM10 concentrations in a room.
●Operating voltage AC/DC 24V
●Signal output 0 to 10 Vdc for PM2.5 and PM10
●Communicative output, Modbus RS485
●Range of use 32°F to 122°F (0 to 50°C)/5 to 95% r.h. (non-condensing)

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Use
The fine dust room sensor is designed to measure and transmit indoor concentrations of
PM2.5 and PM10.
●0 to 10V and Modbus output
●Configurable Modbus parameters
●Quick configuration (on-event addressing) with Siemens ClimatixTM controller
●QSA2700:
–3-color LED service indication
●QSA2700D:
–2.4-inch color LCD screen for PM2.5 and PM10 values and AQI indication
–Energy efficient mode: The screen is off if no obstacle is in front of the sensor (within
3 feet [1 m] for several minutes)
–Micro USB 5 Vdc for display
–Four selectable languages: English, Chinese, German, French
–Three selectable Air Quality Index classes
Type summary
Product
number
Order number
Description
Display
QSA2700
S55720-S457
Room sensor for detection of
PM2.5 and PM10
3-color LED service indication
QSA2700D
S55720-S458
Room sensor with LCD display
for detection of PM2.5 and
PM10
2.4-inch color LCD screen for PM2.5
values, Air Quality Index, and service
AQS2700
S55720-S459
Sensor module for replacement
Order and delivery
When ordering, provide the name and product number, for example: fine dust room sensor
QSA2700.
Each product includes 1 fine dust room sensor (with a pre-installed AQS2700), 1 plastic
mounting plate and 2 screws.
Functions
Device overview

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1
Hole for wiring (top) for surface mounting
2 [QSA2700 only]
LED
3 [QSA2700D only]
LCD display
4
(power supply for display only)
5 [QSA2700D only]
Proximity sensor
6
Push button
7
Hole for wiring (bottom) for surface mounting
8
Hole for attaching the mounting plate to the housing
9
Air outlet
10
Air inlet
LED colors and patterns (QSA2700)
Color
Pattern
Description
Green
Permanently on
Working properly, Modbus configured
Yellow
Permanently on
Working properly, Modbus with factory settings
Red
Permanently on
Error 1, replace sensor module
Red
Flashing (0.5 s on/0. 5 s off)
Error 2, communication error
Red/yellow
Flashing (0.5 s red/0. 5 s yellow)
Possible inaccurate measurement
Modbus configuration
The device is configurable by a Modbus master device. Configure the device before
mounting. See Modbus registers (Software version 1.2.12) [➙9] and Modbus registers
(Software version 1.3.13) [➙10] for more information.
Push button operations for Modbus resetting and configuration
QSA2700:
On-event addressing is a rapid configuration approach working together with Siemens
ClimatixTM controllers.
The sensor is wired and connected to the Climatix TM controller via Modbus.

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Enter addressing mode and configuration workflow using push buttons
Press the
button for
LED
Action
More details
1 to 5 seconds
Constant red
Press and hold the button
5 to 10 seconds
LED off
Release the button
Entering the addressing mode, LED
flashes yellow for 30 seconds.
●Address is temporarily set to 246.
Communication is established
automatically when:
●Baud rate is 19200 (default).
●Format is 1-8-E-1 (default).
●Address is 246.
Then:
●Master writes the Modbus
parameters.
●Master writes 1into register 4x0768
(Bus configuration command) to
activate the change.
After a successful pairing, the LED
flashes green for 60 seconds, then turns
to permanent green.
Otherwise, the LED turns back to its
original state.
LED flashes
yellow for 0 to
30 seconds
Short press the button to set
the address to 246.
If the LED is flashing, a short press of the
push button sets the address to 246.
The LED is off for 2 seconds, then turns
yellow for 2 seconds and then turns to
permanent green.
The address is 246.
Further configuration should be carried
out from the controller side.
Reset Modbus settings or cancel resetting
Press the
button for
LED
Action
More details
1 to 5 seconds
Constant red
Press and hold the button
5 to 10 seconds
LED off
Press and hold the button
10 to 13
seconds
Flash yellow
Reset Modbus setting to
factory default if releasing the
button1)
Release the button while the LED still
flashes yellow. LED keeps flashing yellow
for 3 seconds. then turns red for
1 second.
The reset is completed. LED turns to
permanent yellow.
>13 seconds
Returns to the
initial status
Cancel resetting if releasing
the button
Release after 13 seconds, resetting is
cancelled.
Remark:
1) Only Modbus address, baud rate and transmission format are reset to factory default.

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QSA2700D:
1. From the normal display page, press the push button for 2 to 10 seconds to enter the
Modbus parameter page.
2. Then, following the display indication, press the button for 2 to 10 seconds to enter the
page for Modbus configuration.
3. Select the desired operation by briefly pressing the button.
4. Following the display indication, activate the operation by pressing the button for：
•2 to 10 seconds, to configure manually;
•5 to 10 seconds, to configure the device via Climatix™ or LCD operation interface;
•10 to 20 seconds, to reset the Modbus settings.
Mechanical design
1
Mounting plate
2
Two screws
3
Fine dust room sensor
Product documentation
Title
Document Type
Document Number
Installation, basic operation, parameters
Mounting instructions
A6V11160930
Operation, maintenance, troubleshooting
Basic documentation
A6V11160936
CE declaration
CE declaration
A6V11277342
Product environmental declaration
Product environmental
declaration
A6V11284595
QSA Series Fine Dust Sensors with Selectable
Measuring Range
Submittal sheet
A6V11380383
All documentation can be downloaded at http://siemens.com/bt/download.
Notes
Security
CAUTION
National safety regulations
Failure to comply with national safety regulations may result in personal injury and property
damage.
Observe national provisions and comply with the appropriate safety regulations.
Engineering notes
Shielded cables must be used in environments with EMC problems.

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Twisted pair cables are required for the secondary supply lines and the signal lines.
Mounting
●The sensor is suitable for conduit box mounting, dry wall mounting (with mounting hole
for wires concealed) and surface mounting.
●The recommended height is 5 ft (150 cm) above the floor, especially for type with
display.
●Do not mount the sensor in recesses, shelves, behind curtains or doors, or above heat
sources.
●Avoid direct solar radiation.
●Seal the conduit box or the installation tube if any, as air currents can affect sensor
readings.
●Make sure ambient conditions are within 32 to 122°F (0 to 50°C)/5 to 95% r.h. (no
condensation).
●Do not mount device in places full of oily smoke, for example, in a kitchen.
●Peel off the protective film on air inlet and air outlet before using.
●The air inlet and outlet must be free of any blockage.
Proximity sensor
●The QSA2700D includes a built-in proximity sensor and enters into energy efficient mode
if no obstacle is detected in front of the sensor (within 3 feet [1 m] for several minutes). In
energy efficient mode, the screen is off and the sensor is working and transmitting the
signals at regular intervals. Otherwise, the screen is activated and the sensor is in
continuous working mode.
●The QSA2700 does not have a proximity sensor and is working continuously.
●Keep the proximity sensor area clean as dirt may affect the detection performance.
Replacing the AQS2700
Sensor module accuracy is influenced by ambient environment. Replace the module every 1
to 3 years depending on the local environment. In environments with continuously high
PM2.5 concentrations (that is greater than 300 μg/m3, for example, a smoking room), replace
the module more often.
To replace the sensor module:
1. Detach the housing from the mounting plate using a flat-blade screwdriver.

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2. Remove the module by hand and replace it with a new one.
NOTICE
Turn off the device before replacing the sensor module.
If not possible, insert a new sensor module 10 seconds after the old one is removed.
Disposal
The device is considered electrical and electronic equipment for disposal in
terms of the applicable European Directive and may not be disposed of as
domestic garbage.
●Dispose of the device through channels provided for this purpose.
●Comply with all local and currently applicable laws and regulations.

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Technical data
Power supply
Operating voltage
AC 24V ±20% / DC 13.5 to 35V
Frequency
50/60 Hz @ AC 24V
Power consumption
4 VA
Functional data for PM2.5
Measuring range (selectable)
QSA2700D: Select using user interface
QSA2700: Select using Modbus register 216
●0 to 500 μg/m3
●0 to 300 μg/m3
●0 to 100 μg/m3
●0 to 50 μg/m3
Unit to unit variability
Max of ±15 μg/m3 and ±15% of reading @ 77°F (25°C) and
50% r.h.
Analog output signal, (terminal U1)
0 to 10 Vdc, linear, corresponding to selected measuring range
Functional data for PM10
Measuring range (selectable)
QSA2700D: Select using user interface
QSA2700: Select using Modbus register 216
●0 to 500 μg/m3 (Default)
●0 to 300 μg/m3
●0 to 100 μg/m3
●0 to 50 μg/m3
Unit to unit variability
Max of ±15 μg/m3 and ±15% of reading @ 77°F (25°C) and
50% r.h.
Analog output signal, (terminal U2)
0 to 10 Vdc, linear, corresponding to selected measuring range
Connections
Interface
Micro USB
5V power connection for display only
Wiring connections
Screw terminals
Solid wires or prepared stranded wires: 18 to 26 AWG2
Slotted screws
Size 1, tightening torque 0.6 Nm (0.44 lb-ft).
Wiring lengths for signals.
1970 ft (600 m)
Communication
Communication Protocol
RS485 ModBus
Transmit Mode
RTU
Baud rate (configurable)
9600, 19200 (default), 38400 and 57600 BPS
Modbus address (configurable)
1 (default) to 247
Data
8 bits (0 to 255)
Parity (configurable, following the Transmission
Format)
No Parity or Odd or Even (default)
Stop bits (configurable, following the
Transmission Format)
1 (default) or 2
Max. cable length
1000 m (±200 m)
Identity
Slave

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Transmission Format (start bit - data bits –
parity –stop bit)
0=1-8-E-1 (default) / 1=1-8-O-1/
2=1-8-N-1 / 3=1-8-N-2
Bus Termination
No
Reset button
Yes
Modbus registers (Software version 1.2.12)
The following Modbus registers are used in software version 1.2.12 and earlier.
Holding
Register
(16-bit)
No.
Name
Description
Default
R/W
257
PM2.5 value
Range: 0 to 500
R
258
PM10 value
Range: 0 to 500
R
260
Sensor working status
0: Normal;
1: Replace sensor
module;
2: Communication
error
R
296
Software version
Major version
R
297
Software version
Minor version
R
298
Software version
Build version
R
764
Modbus address
1 to 247
1
R/W
765
Baud rate
1= 9600 bps;
2 = 19200 bps;
3 = 38400 bps;
4 = 57600 bps
2
R/W
766
Transmission format (start bit –
data bits –parity –stop bit)
0 = 1-8-E-1;
1 = 1-8-O-1;
2 = 1-8-N-1;
3 = 1-8-N-2
0
R/W
768
Bus configuration command
0 = Ready;
1 = Load;
2 = Discard
0
R / W
Remarks:
●The register number is counted from 1.
●Register number 768 (Bus configuration command) is for ClimatixTM on-event addressing
configuration.
●Software version format: major version is 1 byte, minor version is 1 byte and build
version is 2 bytes, such as [2.01.33] = 0x02010021.

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Modbus registers (Software version 1.3.13)
The following Modbus registers are used in software version 1.3.13 and later.
Holding
Register
(16-bit)
No.
Name
Description
Default
R/W
9
PM2.5 value
Range: 0 to 500
R
10
PM2.5 reliablility
0: No error
1: Bad reliability or not
available
R
11
PM10 value
Range: 0 to 500
R
12
PM10 reliablility
0: No error
1: Bad reliability or not
available
R
201
PM2.5 (μg/m3): Min. value in
rolling 24hours
R
202
PM2.5 (μg/m3): Average value in
rolling 24hours
R
203
PM2.5 (μg/m3): Max. value in
rolling 24hours
R
204
Number of particles
PM0.3…PM0.5
In pcs for particle size
between 0.3 to
0.5 micron
R
205
Number of particles
PM0.5…PM1.0
In pcs for particle size
between 0.5 to
1.0 micron
R
206
Number of particles
PM1.0…PM2.5
In pcs for particle size
between 1.0 to
2.5 micron
R
207
Number of particles
PM2.5…PM5.0
In pcs for particle size
between 2.5 to
5.0 micron
R
209
Sensor working status
0: Normal;
1: Replace sensor
module;
2: Communication
error
R
216
Analog output range
0: 0 to 500 μg/m3
(default);
1: 0 to 300 μg/m3;
2: 0 to 100 μg/m3;
3: 0 to 50 μg/m3
0
R/W
217
Temperature value via bus
-40 to 248°F (-40 to
120℃
Resolution increment
is 1 ℃
R/W
218
Relative humidity value via bus
0 to 100%
Resolution increment
is 1 ℃
R/W
219
Data receiving interval via bus (in
min) for temperature & relative
humidity
1 to 60 (min)
20
R/W
221
Enable temperature and relative
humidity display via bus
0: disable (default)
1: enable
0
R/W
1286
Software version
Major and minor
version
R
1287
Software version
Build version
R
764
Modbus address
1 to 247
1
R/W

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Holding
Register
(16-bit)
No.
Name
Description
Default
R/W
765
Baud rate
1= 9600bps;
2 = 19200bps;
3 = 38400bps;
4 = 57600bps
2
R/W
766
Transmission format (start bit –
data bits –parity –stop bit)
0 = 1-8-E-1;
1 = 1-8-O-1;
2 = 1-8-N-1;
3 = 1-8-N-2
0
R/W
768
Bus configuration command
0 = Ready;
1 = Load;
2 = Discard
0
R/W
Remarks:
●The register number is counted from 1.
●The precondition for valid displays of temperature (register 217) and r.h. (register 218) is
shown below:
–Register 221is enabled.
–Display value PM2.5 & PM10 in μg/m3is selected as display format.
–Register values are transmitted from the master.
●In the case of a multiple writing command from the master with invalid values, the sensor
rejects the command with an error notice. The register values remain unchanged.
●Bus configuration command (768) is for on-event addressing only.
●Software version format: major version is 1 byte, minor version is 1 byte and build
version is 2 bytes, such as [2.01.33] = 0x02010021.

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Housing protection class
Degree of protection of housing
IP30
Operation conditions
Temperature
Humidity
32 to 122°F (0 to 50°C)
5 to 95% r.h. (no condensation)
Storage and transportation conditions
Temperature
Humidity
-4 to 158°F (-20 to 70°C)
0 to 95% r. h. (no condensation)
Standards
Electromagnetic compatibility
Immunity
Emissions
CE standard EN 60730-1
EN 61 000-6-2
EN 61 000-6-3
EU conformity declaration
A6V11277342 *)
*) The document can be downloaded at http://siemens.com/bt/download.
General data
Color
White
Weight
140 g
Display (QSA2700D)
Screen
Color, no touch
Working status
Only active when people in front within 3 feet [1 m] (±10%); screen turns off
after a few minutes if no presence is detected.
Resolution
1 μg/m3increments
Display
Display PM2.5 value (if value > 500 μg/m3, then display 500+ μg/m3)
Air Quality Index corresponding to measured PM2.5 value
Language (selectable)
English, Chinese (simplified), German, French

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Error info
Error info
0-10 V output
Modbus
LED indication
LCD
Replace sensor
module
Present V (2 s)
and 10V (2 s)
one by one in
turn
Value of register 209
changes from 0 to 1
Red permanently on
Communication
error
Present 0V (5 s)
and 10V (5 s)
one-by-one in
turn
Value of register 209
changes from 0 to 2
Red flashing (0.5 s on/
0.5 s off)
Warning for
possible
inaccurate
measurement
Present the
measured value
Value of register 209
remains 0 without
change
Red/yellow flashing
(0.5 s red 0.5 s yellow)
Diagrams
Wiring
G, G0: Operating voltage AC 24V (SELV)/DC 13.5 to 35V
U1: Signal output DC 0 to 10V for PM2.5 with selected range in
μg/m3
U2: Signal output DC 0 to 10V for PM10 with selected range in
μg/m3
Gu: Signal ground for U1 and U2
+,-, Ref: Modbus signal
Dimensions
NOTE: Use an ARG70 adapter plate (sold seperately) to mount a QSA2700/QSA2700D
sensor on a 2“× 4“box.

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Issued by
Siemens Industry, Inc.
Smart Infrastructure
1000 Deerfield Parkway
Buffalo Grove, IL 60089
USA
Tel. [phone]
Technical specifications and availability subject to change without notice.
Document ID
A6V11396712
Edition
2020-08-17