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PM2.5 which can go directly to the lungs contains more toxic heavy metals and the hazardous organic pollutants, what’s more, it is more easily attached to bacteria and viruses in the environment, so the particles are greater impacted on the ecological environment and human health. After OPC-N2, Alphasense has launched a particle counter OPC-R2(an upgraded version of OPC-R1) with a very small size, which able to measure PM1, PM2.5 and PM10. It has a faster flow rate than that of OPC-N2 and OPC-N3, but with much lower power consumption, all these making the unit a highly cost effective product.

Main spec of OPC-R2:

Particle range*                     μm spherical equivalent size (based on RI of 1.5)    0.30~12.4

Size categorisation              Number of software bins                                          16

Total flow rate                      L/min (typical)                                                          0.24

Max particle count rate       particles/second                                                      10,000

Measurement mode            mA (typical)                                                              110

Standby mode                     mA (typical)                                                              < 5

Voltage range                      VDC                                                                           4.8 to 5.2

Digital interface                                      (No data storage)                                                                                            SPI Mode 1