7
2.2.2 Fractionating Head System
The fractionating head system is shown in Figure 3 and includes the
fractionating column, column baffle, the capillary funnel, and the exhaust
system components. Assemble as follows:
1. Place the fractionating column in the column receptacle (shown in
Figure 2) and place the column baffle in the top of the column with the
tapered end up.
2. Insert the capillary funnel adapter into the largest opening of the vent
trap body.
Note: The Hach Fume Scrubber Apparatus can be used in place of the aspirator.
Fumes are drawn into a chemical absorber module and absorbed by an activated
carbon filter. This filter is replaced when the absorbing capacity is exhausted. The
Fume Scrubber is designed for running up to six digestions simultaneously. .
3. Place the vent trap cap on the capillary funnel adapter .
4. Place the assembled capillary funnel adapter and vent trap parts on the
fractionating column.
5. Insert the capillary funnel stem into the hole in the vent trap cap.
6. Install the aspirator in a suitable water tap over a sink. Install the hose
barb fitting in the aspirator side port and install the extension tube.
DANGER
The Hach Fume Scrubber Apparatus can only be used with the
Digesdahl Digestion Apparatus for sulfuric acid digestions. Hazardous
conditions could develop if fumes from an alternate acid are vented with
the Fume Scrubber. It is important to clean the Fume Scrubber after
each use to prevent corrosion (see Operation section of Fume
Scrubber manual).
DANGER
L'épurateur de fumées Hach peut seulement être utilisé avec le
minéralisateur Digesdahl pour des minéralisarions à l'acide sulfurique.
Des conditions de risque peuvent être créées par l'aspiration de vapeurs
d'un autre acide dans l'épurateur de fumées. Il est important de
nettoyer l'épurateur de fumées après chaque utilisation pour éviter
la corrosion.
7. A 6.25-foot length of C-flex tubing is supplied with the aspirator. Cut
a segment approximately 16 inches long and connect the top stem of
the column receptacle to the vent trap body. Cut another segment from
the remaining tubing to connect the aspirator to the lower stem of the
column receptacle. This segment should be kept taut with no drape
that can collect condensate. The fractionating head system is now
assembled for use.
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