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PurpleAir PA-II-SD
PurpleAir PA-II-SD
PurpleAir PA-II-SD
PurpleAir PA-II-SD

PurpleAir PA-II-SD

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The PA-II-SD is an air quality sensor that measures real-time PM2.5 concentrations for residential, commercial, or industrial use. Built-in WiFi enables the sensor to transmit data to the PurpleAir map, where it is stored and made available to any smart device. For locations with limited or no WiFi access, the PA-II-SD incorporates an SD card and real-time clock, allowing the sensor to record and store data locally.*

Dimensions 3.5 in x 3.5 in x 5 in
(85 mm x 85 mm x 125 mm)
Color White
Intended Use Outdoor and indoor use
WiFi Yes
Internal Storage Yes, 16GB microUSB
Warranty One (1) year limited warranty

*Internal data stored on the microSD card cannot be uploaded to the PurpleAir map.

Dimensions 3.5 in x 3.5 in x 5 in
(85 mm x 85 mm x 125 mm)
Sensor weight
with power supply
12.4 oz (352 g)
25.0 oz (709 g)
Power supply length 17 ft (5 m)
Color White
Power Supply
Weight 12.6 oz (357 g)
A/C input 100-240V AC, 50/60Hz, 1.5A
A/C output 5V DC, 3A
Sensor input 5V DC, 0.18A continuous, 600mA peak
Weather resistance IP68
Plug type 2 Pins, Type A (USA)
Wireless Networks 802.11b/g/n @ 2.4GHz
(WPA2 pre-shared key or open networks)
Certificates FCC/CE/ TELEC/SRRC
Tx Power 802.11 b: +20 dBm
802.11 g: +17 dBm
802.11 n: +14 dBm
Rx Sensitivity 802.11 b: -91 dbm (11 Mbps)
802.11 g: -75 dbm (54 Mbps)
802.11 n: -72 dbm (MCS7)
Antenna Type 2 dBi on-board PCB antenna
Laser Particle Counters
Type (2) PMS5003
Range of measurement 0.3, 0.5, 1.0, 2.5, 5.0, & 10 μm
Counting efficiency 50% at 0.3μm & 98% at ≥0.5μm
Effective range
(PM2.5 standard)*
0 to 500 μg/m³
Maximum range (PM2.5 standard)* ≥1000 μg/m³
 Maximum consistency error (PM2.5 standard) ±10% at 100 to 500μg/m³ & ±10μg/m³ at 0 to 100μg/m³
 Standard Volume 0.1 Litre
 Single response time ≤1 second
 Total response time ≤10 seconds
Pressure, Temperature, & Humidity Sensor
Type BME280
Temperature range -40°F to 185°F (-40°C to 85°C)
Pressure range 300 to 1100 hPa
Humidity Response time (τ63%): 1 s
Accuracy tolerance: ±3% RH
Hysteresis: ≤2% RH
SD Card Reader & Real-time Clock
Real-time Clock (RTC) DS3231
SD Card 16GB microSD card included
takes microSD cards up to 64GB
SD Card Format FAT32
SD Card Data Access Remove microSD card with tweezers & connect to computer to download csv data files