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Measured Parameters: Absorption coefficient (Babs); Scattering coefficient (Bscat)
Auxiliary Parameters: Temperature; Pressure; Relative humidity
Derived Parameters: Black carbon (BC) mass; Extinction coefficient (Bext); Single scattering albedo (SSA); Dew point
Measurement Range (Absorption & Scattering): < 1 Mm⁻¹ – 10,000 Mm⁻¹ (870 nm, 60 sec averaging)
Aerosol Medium: Air, 0 – 40 °C (32 – 104 °F)
Laser: 870 nm, 1.4 W (standard); optional 405 nm and 532 nm; modulation frequency: 1500 Hz nominal (square wave)
Angular Integration (Scattering): 6 – 174°
Sample Flow Rate: 1 L/min
Flow Control: Critical orifice
Pump: Diaphragm
Response Time: < 10 sec; 1-second resolution
Data Averaging Time: 1, 10 or 60 seconds (user selectable)
Calibration Interval: Recommended every 6 months or before/after critical projects
Calibration Particles:
Absorption: Strongly absorbing particles (e.g., black smoke, glassy black carbon)
Scattering: Strongly scattering particles (e.g., ammonium sulfate, PSL spheres 200–260 nm)
Zero Check: On demand or automatic (5, 15, 20, 30, or 60 min); using high-efficiency filtered air
Front Panel Features: Graphical color touch-panel display; 2 USB-A ports; Power switch; Touch screen user interface (keyboard interface also supported)
Rear Panel Connections: Sample inlet (¼” compression fitting); Pump exhaust (¼” compression fitting); AC and DC power connections; RS-232 serial port; Ethernet port; 2 analog BNC inputs; 4 analog BNC outputs
Data Storage Capacity: >200 days
Communications Output: Ethernet 100/10 Mbps; RS-232 serial
Power Requirements: 90 – 264 V, 47 – 63 Hz (AC) or 12 VDC; power consumption 25 W
Dimensions: 18 cm (H) x 48 cm (W) x 61 cm (D) (7” x 19” x 24”); rack mountable
Weight: 18 kg (40 lb.)
Environmental Operating Conditions: Temperature: 0 – 40°C (32 – 104 °F); Relative humidity: 0 – 90% RH, non-condensing
PAX Maintenance Console (PMC) Software: Executable program written in LabVIEW; External PMC software for maintenance, data playback and archiving; Computer and PMC software not required for instrument operation
Computer Requirements (PMC Software): Windows XP, Vista, or Windows 7; Minimum 1 GB RAM (computer not included)