29 1800223 E
APPENDIX C
Aerosol Output Calculation
Laskin Nozzle Jet Aerosol Output Calculation
This model allows selection of either 2 or 6 Laskin nozzle jets using the “Jet Control”
valve. The aerosol concentration produced is dependent upon the nozzle pressure, the
chosen aerosol reagent and the volume of air used to dilute the raw aerosol produced.
The equation below is intended for calculating the aerosol concentration when required
and assumes a nozzle pressure of either 20 psi for DOP (DEHP) or 23 psi for PAO-4.
The results may be expressed as either micrograms per liter (ug/l) or milligrams per
meter
3
(mg/m
3
). Other aerosol reagents, and the required nozzle pressures, are listed in
the table below.
3,375 times the # of jets in use (2 or 6)
Total airflow (CFM)
Note: Adjustment of the nozzle pressure to accommodate the reagent in use is
independent of the photometer internal reference reagent setting.
Aerosol Reagent Nozzle Pressure (PSI)
DOS/DEHS (CAS 122-62-3) 24.4
white mineral oil (CAS 8042-47-5) 22
polyethylene glycol (CAS 24322-68-3) 26.6
paraffin oil (CAS 8012-95-1) 24.2
corn oil (CAS 8001-30-7) 23.4
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