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Lasair II Particle Counter Operations Manual
Chapter 1: Getting Started
Specifications
Size Range
0.3–25.0 µm
Number of channels
6
Altitude correction
Altitude correction is automatically performed with internal
pressure transducers.
Altitude range
0–3,000 m
Maximum
concentration 350L
>350,000/ft.
3
at 5% coincidence loss
Maximum
concentration 550L
>250,000/ft.
3
at 5% coincidence loss
Maximum
concentration, models
510A, 310, 510, 525
>900,000/ft.
3
at 10% coincidence loss
Maximum
concentration, models
310A and 325
>375,000/ft.
3
at 5% coincidence loss
Counting efficiency,
Models 310A, 310B,
and 510A
>50 % ±10 % (exceeds JIS standard)
Zero count level
<1 count/5 minutes at minimum size (meets JIS standard)
Laser source
Diode laser
Calibration
Materials traceable to US National Institute for Standards and
Technology (NIST)
Environmental sensors
Temperature/Relative Humidity sensor, plus interfaces with 4
external environmental sensors via 4–20 mA input
Data storage
3,000 sample records
Statistical standards
supported
• EU GMP Annex #1
• ISO 14644-1
• FS-209E
• BS5295
• Simple averaging
Communication Modes
• Ethernet
• RS-232
• USB download
• Optional 4–20 mA output (board required)
