Alphasense PM2.5 Particle Sensor - OPC-N2

• Particle range: 0.38 to 17 Spherical equivalent size (based on RI of 1.5)
• Size categorisation: 16Number of software bins
• Max particle count rate: 10,000Particles/second
• Temperature range: -10 to 50°C
• Humidity range: 0 to 99 %rh continuous, non-condensing
• Weight : < 105 g
Voltage range: 4.8 to 5.2VDC

  • Model Number: OPC-N2
  • Data Sheet: Date Sheet File
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  • Alphasense PM2.5 Particle Sensor
  • Alphasense PM2.5 Particle Sensor
  • Alphasense PM2.5 Particle Sensor
  • Alphasense PM2.5 Particle Sensor
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Product Specification

OPC-N2 Alphasense PM2.5 Particle Sensor Description

Alphasense is dedicated to supplying sensors for air quality networks. Increased awareness of the health danger from particulates has raised significantly the importance of monitoring PM.  Our Optical Particle Monitor OPC-N2 measures PM1, PM2.5 and PM10, augmenting our range of gas and VOC sensors for indoor and urban air quality monitoring.

The OPC-N2 originated from research at the Centre for Atmospheric and Instrumentation Research, University of Hertfordshire and has subsequently been developed and refined with five years of Alphasense and UoH collaboration, including the capture of more than 150 million readings at Heathrow airport.

The OPC-N2 measures particles from 0.38 micron to 17 micron diameter accurately, repeatedly, and with minimal maintenance using the patented ‘pump-less’ design.  A proven technology, the OPC-N2 provides both PM readings and real time particle size histograms, competing in performance with existing analytical units but at a fraction of the cost.

* Micro USB socket allows on-site firmware updates
* Onboard data logging using optional 16GB SD card: 12 months' capture
* SPI control of fan and laser for lowest power
* Factory set:
   particle size
   particle density/Total RI
   bin weighting for respirable profiling

OPC-N2 Alphasense PM2.5 Particle Sensor MEASUREMENT
Particle range Spherical equivalent size (based on RI of 1.5) 0.38 to 17
Size categorisation Number of software bins 16
Sampling interval Histogram period (seconds) 1.4 to 10
Total flow rate (typical) L/min 1.2
Sample flow rate (typical) mL/min 220
Max particle count rate Particles/second 10,000
Max coincidence probability %concentration at 10 6 particles/L 0.84

%concentration at 500 particles/L 0.24

OPC-N2 Alphasense PM2.5 Particle Sensor POWER
Measurement mode mA (typical) 175
Laser on, fan off mA (typical) 95
Voltage range VDC 4.8 to 5.2
Switch-on transient mW for 1ms < 5000

Alphasense PM2.5 Particle Sensor OPC-N2 DATA 
Digital interface/connections  Micro USB (progamming), SPI (data)
Data storage  micro-SD (.CSV format) 16GB

OPC-N2 Alphasense PM2.5 Particle Sensor KEY SPECIFICATIONS
Digital interface  SPI (Mode 1), USB
Laser classification  as enclosed housing Class 1
Temperature range  °C  -10 to 50
Humidity range  % rh (continuous) 0 to 99 (non-condensing)
Weight  g < 105

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