OPC-N3 is the 3^rd version of the particle counter based on OPC-N1 and OPC-N2. The appearance and dimension of OPC-N3 remains the same as that of OPC-N2, while its range has extended to 0.38~40um, meanwhile the number of channels has been added from 16 to 24. Besides, it has included an on-board temperature and humidity sensor, reducing the power consumption of standby mode. It is able to detect OM1, PM2.5 and PM10.

Main spec of OPC-N3:

Particle range*                  μm spherical equivalent size (based on RI of 1.5 )          0.35~12.4

Size categorisation           Number of software bins                                                 24

Total flow rate                   L/min (typical)                                                                 5.5

Max particle count rate     particles/second                                                             10,000

Measurement mode         mA (typical)                                                                     175

Standby mode                  mA (typical)                                                                      50

Voltage range                   VDC                                                                                  4.8 to 5.2

Digital interface                SPI (real-time data and communications)

                                           Micro USB (firmware updates and standalone mode)

Data storage micro-SD (.CSV format)                                      (GB)                           16

Advantages and applications of OPC-N3

1.       Specifically designed for big particles, concentrations of the particles can be up to 2000ug/m3, mainly used in heavily polluted environment.

2.       Particle range being extended to 40um is helpful to recognize pollen

3.       24 channels enable to detect more sizes and shapes, so as to identify polluting source with more info.