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