PM2.5 sensor (PM2.5 detector OPC-N2) (dust sensor)

PM2.5 Sensor (OPC-N2 PM2.5 Detector) (Dust Sensor) Detailed Introduction:
PM2.5 sensor (PM2.5 detector) (dust sensor) refers to micro particles with a diameter of less than or equal to 2.5 microns in the atmosphere. Although their content is low in the atmosphere, they have a significant impact on air quality and visibility. Compared with larger particulate matter, PM2.5 has a smaller particle size, is rich in a large amount of toxic and harmful substances, and has a longer residence time in the atmosphere. It has a longer transportation distance and poses a great threat to human health and atmospheric environmental quality. Alpahsense, a British company, has developed and launched the PM2.5 sensor (OPC-N2 PM2.5 detector) (dust sensor), which uses the principle of light scattering and particle counting technology to accurately detect the amount of micro particles in the surrounding environment, providing practical reference data for environmental improvement.

The PM2.5 sensor (PM2.5 detector) OPC-N2 is a lightweight device that uses advanced optical systems and precise electronic processing devices to provide fast and accurate particle number and size distribution detection. It is an upgraded second-generation product of Alphasense based on the OPC-N1, which not only includes the original SPI digital signal, but also adds a USB digital interface. When adding a USB interface to N1 to N2, a built-in 16GB SD card is also added to store data
More optimized in terms of circuit and structure, with lower power consumption.
Its main characteristics are as follows:
measurement
Microparticle range (um) spherical equal area size 0.38~17
Number of software trees for size classification (standard) 16
Sampling interval (seconds) Bar chart time 1.4~30
Flow rate L/min 1.2
Microparticle counting rate Microparticle/second 10000
Consistent probability of 106 micro particles/liter concentration percentage 0.84
power consumption
Measurement mode mA (typical) 175
Laser on, fan off mA (typical) 95
Key Performance
Digital Interface SPI (Mode 1), USB
Laser grade enclosed enclosure level 1
Temperature range ℃ -10~50
Humidity range% RH 0~99 (non condensing)
Weight g<105<span="">
Internal structure and testing principle:
Unlike traditional particle counters that use air pumps and sample gas filters, OPC-N2 adopts a completely different approach. It uses a combination of custom designed elliptical mirrors and a dual element photodetector to create a "virtual sensing zone" in the central free space of an open scattering chamber. Then the sensing area and its surrounding space will be illuminated by a thin strip laser beam. The air containing particles passes through the scattering chamber without constraint and can pass through the laser beam sensing area inside and outside, but only those particles that pass through the sensing area can be confirmed by the dual element detector and counted/measured by OPC electrons.
This new design can use a miniature low-power fan instead of an air pump to generate the required particle flow through the induction zone without the need for any form of particle filter. This avoids the need for regular replacement of conventional air pump protection filters and instead allows for long-term maintenance free on-site operations.
Application scope:
HVAC system
Indoor air quality testing
Outdoor environmental monitoring
Roadside monitoring station
Industrial measurement
Emission monitoring
OPC-N2 adopts a brand new particle counting algorithm, integrating aerodynamics, laser detection technology, digital signal processing, and opto mechatronics research and development. It has the characteristics of high testing accuracy (can be subdivided into 16 channels for testing), stable performance, fast response time, easy portability, and convenient operation. Low prices are conducive to conducting multi-point distribution detection, forming a dense detection network, and accurately providing a basis for studying air pollution conditions.