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The SP2 is Droplet’s premier instrument for direct measurement of black carbon in individual aerosol particles. 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.
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Detailed Specs
- Measured Parameters: Single-particle laser incandescence Single-particle light scattering
- Auxiliary Parameters: Temperature Pressure
- Derived Parameters: BC mass distribution as function of particle diameter Particle number distribution as a function of particle size
- 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
- Aerosol Medium: Air, 0 – 40 °C (32 – 104 °F)
- 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
Computer System
- On-board Intel®Core™ i7 CPU
- 8 GB RAM
- 750 GB hard drive for data storage
- NI PCI-6133 DAQ interface card
- NI PCI-6259 housekeeping data card
- User interface via standard keyboard, mouse, and 19” monitor (included)
- Data Storage Capacity: Depends on number of particles; at a concentration of 1,000 #/cm3 and a standard flow rate of 120 volumetric cm3 /minute, the SP2 computer has the capacity to store 56 hours of continuous data
- Communications Output: Gigabyte Ethernet interfaced through an Intel® PC82573V PCIe GbE controller
- Power Requirements: SP2: Universal Voltage External Pump: 30 W
- 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 19″ Monitor: 37 cm W x 22 cm L x 39 cm H
- Weight: SP2: 26.1 kg Pump: 3.4 kg 19″ Monitor: 3 kg
- Environmental Operating Conditions: Temperature: 0 – 40°C RH: 0 – 100% RH non-condensing
