Labconco Fume Adsorbers 3955422 - Manual (Page 25)

Chapter 6: Maintaining Your Enclosure
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1. The carbon filter(s) are replaced by first removing the rear perforated
baffle.
2. Remove the upper support bracket for the filter. Then loosen the lower
support bracket.
3. Carefully remove the carbon filter. For 60" wide units there are two carbon
filter(s)
4. Replace the new carbon filter(s) with the gasket on the downstream side
facing the blower. Replace the filter support brackets and tighten.
5. Replace the perforated baffle; replace and tighten the screws.
Calculating Carbon Filter Life
Labconco developed a modeling program to estimate the filter life for typical
carbon filters. Since filter life is dependent on the chemical used, the airflow, filter
size, and the dwell time, refer to the Chemical Guide for the Paramount® Filtered
Enclosure. The estimated life for carbon filters for the Fume Adsorbers with
integral impeller is conservatively calculated at 10% of the published values for
the Paramount in the Chemical Guide. Consult with a Labconco Technical
Specialist for further information on filter life. For example, if you use p-Xylene
in your process and evaporate approximately 100 ml per week during 2 hours of
use per day then follow these steps to calculate the concentration in parts per
million (ppm).
Steps for Calculating PPM and Filter Life
1. Determine the amount of the proposed chemical lost to evaporation over a
given amount of time. For example, if you use p-Xylene and lose
approximately 100 ml per week during 2 hours of use per day.
2. Convert the amount lost into ml/min. For this example:
100 ml X 1 week X 10 hours = 100 ml lost
week 10 hours use 600 minutes 600 minutes
3. Convert ml/min to PPM by multiplying ml/min by the conversion factor
found in the second to the last column on the right of the Paramount
Chemical Guide. For p-Xylene .17 x 25 = 4.2 PPM.
4. Find the PPM value on the chart that comes closest to the value you just
calculated in step #3. In this example, round up to 5 PPM, which is close to
the calculated 4.2. We may approximate the filter life to be around 437 hours
of actual use, but use 10% of this for the Fume Adsorber filter or 44 hours.
5. Insert the estimated filter life to determine how long filters will last.
44 hours filter life
10 hours per week use
6. This value is for one organic vapor filter. So, 4.4 weeks is approximately
one month before filter saturation.
= 4.4 weeks before filter saturation
= .17 ml/min