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isweek Alphasense PM2.5 Particle Monitor OPC N2 .pdf


Original filename: isweek Alphasense PM2.5 Particle Monitor - OPC-N2.pdf
Title: OPC-N2 April15.pmd
Author: SALES2

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OPC-N2 P
ticle
artic
Par
le Monitor
tic
ar

Technical Specification

Figure 1 OPC-N2 Schematic Diagram

All dimensions in millimetres (± 0.15mm)

* 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
MEASUREMENT
Particle range
Size categorisation
Sampling interval
Total flow rate (typical)
Sample flow rate (typical)
Max particle count rate
Max coincidence probability
POWER
Measurement mode
Laser on, fan off
Voltage range
Switch-on transient

Spherical equivalent size (based on RI of 1.5)
Number of software bins
Histogram period (seconds)
L/min
mL/min
Particles/second
%concentration at 106 particles/L
%concentration at 500 particles/L

0.38 to 17
16
1.4 to 10
1.2
220
10,000
0.84
0.24

mA (typical)
mA (typical)
VDC
mW for 1ms

175
95
4.8 to 5.2
< 5000

DATA
Digital interface/connections Micro USB (progamming), SPI (data)
Data storage
micro-SD (.CSV format)
KEY SPECIFICATIONS
Digital interface
Laser classification
Temperature range
Humidity range
Weight

SPI (Mode 1), USB
as enclosed housing
°C
% rh (continuous)
g

16GB

Class 1
-10 to 50
0 to 99 (non-condensing)
< 105

At the end of the product’s life, do not dispose of any electronic sensor, component or instrument in the domestic waste, but contact the
instrument manufacturer, Alphasense or its distributor for disposal instructions.
NOTE: As applications of use are outside our control, the information provided is given without legal responsibility. Customers should test under their own conditions, to
ensure that the sensors are suitable for their own requirements.

ta
ormance Da
erf
OPC-N2 P
Data
erformance
Perf
The OPC correlates well
when validated with Grimm and
TSI instruments.

Figure 3 Particle size distribution for 5 mm alumina (Spherisorb)
as displayed on PC, direct from the OPC-N2.
Figure 3 shows the OPC-N2
particle size distribution for a
calibration aerosol.

Figure 4 TSI 3300 Particle size count for 5um Alumina (Spherisorb)
Figure 4 shows the TSI 3300
displayed particle size
distribution for the same
calibration aerosol, as
measured by University of
Hertfordshire.

4

3

3

# / cm (e2)

Technical Specification

Figure 2 Particle size derivative comparison

2

Calculated PM from particle
size includes assumptions
about particle density and
refractive index which will vary
with application.

1

0
0.3
0.3

0.5
0.5

11

22

Size (µm)

33

4

4

5

5

78

10
10


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