Droplet SP2 Single Particle Soot Photometer (200 – 430 nm; 1.8 g/cm³; 25,000 particles/second)

Measured Parameters: Single-particle laser incandescence; Single-particle light scattering

Auxiliary Parameters: Temperature; Pressure

Derived Parameters: BC mass distribution as a function of particle diameter; Particle number distribution as a function of particle size

Number Concentration Range:

25,000 particles/second

0 – 12,500 particles/cm³ at standard flow rate of 120 cm³/minute

Particle Size Range:

Scattering signal: 200 – 430 nm (this range encompasses the accumulation mode of most particles, where most mass is found). Can be extended to 700 nm by post-processing of saturated signals

Incandescent signal: depends on particle density, approximately 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)

Response Time: 1 Hz for standard output products

Lasers:

Nd:YAG: 1064 nm, 3 MW/cm² intracavity

Pump: 808 nm, 4 W

The pump laser can be controlled via SP2 software or through the front panel touch screen

Sample Flow: 30 – 180 cm³/minute (typically 120)

Flow Control: Electronic flow control with laminar flow element (LFE) and solenoid valve

Pump: Two single-head diaphragm pumps enclosed in a box

Minimum Black Carbon Detection Limit: 10 ng/m³; 0.3 fg/particle

Software:

SP2 executable program (written in LabVIEW)

PSI SP2 Toolkit program (written in Igor)

Data Storage Capacity: Depends on particle number; at a concentration of 1,000 particles/cm³ and a flow rate of 120 cm³/minute, approximately 56 hours of continuous data storage

Communications Output: Gigabit Ethernet via 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 x 25 cm x 10 cm

19” Monitor: 37 cm x 22 cm x 39 cm

Weight:

SP2: 26.1 kg

Pump: 3.4 kg

19” Monitor: 3 kg

Environmental: Temperature: 0 – 40 °C (32 – 104 °F)

Operating Conditions: Relative Humidity: 0 – 100% RH, non-condensing

Datasheet