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Submittal Sheet
Document No. A6V11380355
August 17, 2020
QSA Series Fine Dust Sensors with Selectable Measuring Range
Siemens Industry, Inc.
Product Numbers
Model
Orderable No.
Description
QSA2700
S55720-S457
Fine Dust Sensor
QSA2700D
S55720-S458
Fine Dust Sensor with Display
AQS2700
S55720-S459
Replacement Sensing
Element
Features
• Dual 0 to 10V ouputs
o U1: PM2.5 particulate
o U2: PM10 particulate
• Modbus RTU network capable
• 3-color LED operating status indicator (QSA2700)
• QSA2700D
o 2.4-inch color LCD display for PM2.5 values
and AQI indication.
o Four selectable languages: English, Chinese,
German, and French.
Typical Specifications
The fine dust/particulate matter sensor shall be a wall-
mounted device capable of measuring and transmitting
measured concentrations of particulates falling within the
PM2.5 and PM10 ranges. A separate 0 to 10V output shall
be provided for each range, or sensor shall be capable of
transmitting data to a network using a Modbus RTU. The
measuring range shall be 0 to 500 micrograms per cubic
meter. Sensors shall have a maximum unit-to-unit variability
of ±15 μg/m3 and ±15% of reading @ 77°F (25°C) and
50% rh.
If a display is required, the display shall be full color LCD
capable of displaying PM2.5 concentration with 1 μg/m
3
resolution as well as general air quality index based on
selectable Class I, Class II and Class III categories. The unit
shall be equipped with a proximity sensor that allows the
display to enter sleep mode if no movement is detected.
Measuring range shall have the following field selectable
ranges:
• 0 to 500 μg/m3
• 0 to 300 μg/m3
• 0 to 100 μg/m3
• 0 to 50 μg/m3
For additional information on particulate matter, visit
https://www.epa.gov/pm-pollution.
Description
Technical Data
Operating voltage 24 Vac ± 20%/13.5 to 35 Vdc
Frequency 60 Hz @ 24 Vac
Measuring range 0 to 500 μg/m
3
Unit-to-unit variability Maximum ±15 μg/m
3
and ±15% of
reading @ 77°F (25°C) and
50% rh
Analog output Signal 0 to 10 Vdc, linear,
0 to 500 μg/m
3
selectable range*
• 0 to 500 μg/m3 (default)
• 0 to 300 μg/m3
• 0 to 100 μg/m3
• 0 to 50 μg/m3
Communication protocol RS485 ModBus RTU
Wiring length (max) 1,970 ft (600 m)
Enclosure NEMA 1 (IP30)
Ambient conditions
Operation temp. 32°F to 122°F (0°C to 50°C)
Humidity 5 to 95% rh (non-condensing)
Transportation temp. –4°F to 158°F (–20°C to 70°C)
Humidity 5 to 95% rh (non-condensing)
Color White
Weight 5 oz. (140 g)
Display (QSA2700D)
Screen Color
Sleep mode Display enters sleep mode when
no movement is detected within
three feet of the sensor front.
Resolution 1 μg/m
3
increments
Display PM2.5 value (if value
> 500 μg/m
3,
then display
500+ μg/m
3)
Air Quality Index corresponding
to measured PM2.5 value.
Language English, Chinese (simplified),
German, and French.
*QSA2700D: Select through user interface
QSA2700: Select through Modbus register 216

Summary of content (2 pages)