Fine Dust Room Sensors QSA2700D/QSA2700/AQS2700 These sensors acquire the PM2.5 and PM10 concentrations in a room. ● ● ● ● A6V11396712 2020-08-17 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.
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.
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
Enter addressing mode and configuration workflow using push buttons Press the button for LED Action 1 to 5 seconds Constant red Press and hold the button 5 to 10 seconds LED off Release the button More details 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.
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.
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.
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.
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.
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 257 PM2.
Modbus registers (Software version 1.3.13) The following Modbus registers are used in software version 1.3.13 and later. 10 Siemens Smart Infrastructure Holding Register (16-bit) No. Name Description 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.
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.
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) Electromagnetic compatibility Immunity Emissions CE standard EN 60730-1 EN 61 000-6-2 EN 61 000-6-3 EU conformity declaration A6V11277342 *) Standards *) The document can be downloaded at http://siemens.com/bt/download.
Error info Error info 0-10 V output Replace sensor Present V (2 s) module and 10V (2 s) one by one in turn Modbus LED indication Value of register 209 changes from 0 to 1 Red permanently on Communication Present 0V (5 s) Value of register 209 error and 10V (5 s) changes from 0 to 2 one-by-one in turn Red flashing (0.5 s on/ 0.5 s off) Warning for possible inaccurate measurement Red/yellow flashing (0.5 s red 0.
Issued by Siemens Industry, Inc. Smart Infrastructure 1000 Deerfield Parkway Buffalo Grove, IL 60089 USA Tel. +1 847-215-1000 14 Siemens Smart Infrastructure Document ID A6V11396712 Edition 2020-08-17 Technical specifications and availability subject to change without notice.
