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Single Particle Soot Photometer (SP2)

The SP2 is Droplet’s premier instrument for direct measurement of black carbon in individual aerosol particles.

Product Description The SP2 delivers unmatched detail about black carbon particles, including mass, size, heat of vaporization, and coating – critical information for characterization of pollution sources, accurate description of optical properties, and prediction of health effects.

Advantage Characteristics

Technical Parameter

Application Scope

Classic Cases

Advantage Characteristics

Control the instrument, display data, and log data with UI software and a user-friendly virtual instrument panel. Perform advanced data analysis and create journal-quality reports with a comprehensive toolkit. Get full characterization of each individual black carbon particle (mass, size, heat of vaporization, and coating) with simultaneous measurement of incandescence and light scattering.

Enhance model effectiveness by capturing variances in black carbon make-up with single particle detection. Measure black carbon independently of particle mixing state with Nd:YAG intracavity laser-induced particle incandescence (LII). Detect black carbon at concentrations below 10 ng/m3 with dual gain stages – enabling full characterization in the cleanest environments.

Technical Parameter

Measured parameters Single-particle laser incandescence Single-particle light scattering
Derived parameters BC mass distribution as function of particle diameter Particle number distribution as a function of particle size
Auxiliary parameters Temperature Pressure
Maximum data acquisition rate 0 – 12,500 particles/cm³ at 120 vccm (0 - 25,000 particles/sec; concentrations can basically increase until particles become coincident)
Particle size range Scattering signal: 200 – 430 nm diameter (this range encompasses the accumulation mode of most particles, i.e. range where most mass is found). Incandescent signal: depends on particle density, but 70 – 500 nm mass-equivalent diameter assuming a black carbon density of 1.8 g/cm³
Lasers Nd:YAG Laser: 1064 nm, 3 MW/cm² intracavity circulating power Pump Laser: 808 nm, 4 W
Sample flow 30 – 180 volumetric cm³ /minute (typically 120)
Flow control Electronic flow control with a laminar flow element (LFE) and a solenoid valve
Pump Two single-head diaphragm pumps encased in a box
Minimum black carbon detection limit 10 ng/m³，0.3 fg/particle
Front panel display System power switch 2 USB 2.0 ports 1/8 in. Swagelok^® sample inlet Laser ON/OFF indicator light
Rear panel connections Keyboard port Mouse port VGA and HDMI monitor ports Ethernet port 2 RS-232 communications ports 4 USB 2.0 ports eSATA port ¼ in. Swagelok^® purge line ¼ in. Swagelok^® exhaust line Exhaust vents System and pump power connections
Power requirements SP2: Universal Voltage External Pump: 30 W
Weight SP2: 26.1 kg Pump: 3.4 kg
Dimensions SP2: 48 cm W x 61 cm L x 26 cm H Pump: 20 cm W x 25 cm L x 10 cm H
Aerosol medium Air, 0 - 40 °C (32 - 104 °F)
Environmental operating conditions Temperature: 0 – 40°C (32 – 104 °F) RH: 0 – 100% RH non-condensing