Dust Monitoring

Particle counting

To follow changing airborne dust levels continuously, the Dylos Laser Particle Counter #DC-1100 “A.Q.Monitor”  displays:

  • a dynamic bar graph of instantaneous particle concentrations, and
  • numbers for 2 particle size ranges, shown as “particles per 0.01 cu.ft.”:
    • Small (>1 µm) (fine dust,) on the left, and
    • Large (>5 µm) (coarse dust) on the right, with
    • counts of Small including the Large (with counts only about 1/10th of the Small; both >1 µm).
    • Small are inhaled more deeply.

The Dylos can set the operating mode to run as either:

  • continuous (counts & bar graph update every second, records each minute), or
  • monitor (records 1 minute each hour, shows latest, stores 30 days)

Airborne particle level descriptions

Readings by the Delos monitor of Small (>1 µm) “particles per 0.01 cu.ft.” can be ranked as:

      • >1000 very high
      • >500 high
      • >300 moderate
      • <300 low
      • <100 very low

Note that these readouts are the number of “particles per 0.01 cubic feet”, so to convert to other units:

      • multiply reading by 100 to get particles per cubic foot (x100= #/ft3), or
      • multiply reading by 4000 to get particles per cubic meter (x4000= #/m3), or
      • multiply reading by 4 to get particles per liter (x4= #/L) (tho most convenient smaller numbers to work with).

(For example, one might set a high “action level” at a reading of 500, which is 50,000/ft3 or 2000/L.)


>see previous page for how particle size matters
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