Labconco Rapid Digestor Fume Removal System 2354000 - Manual (Page 8)

OPERATION
8
Operation
Place exhaust manifold on top of digestion tubes immediately after placing tubes in
digestor. Refer to Digestor instruction manual for operation of digestor. Alignment is
accomplished by a side to side, front to back motion. It is not necessary to have a full rack of
tubes in place, but there must be a tube in each corner and the center of the digestor for support
of the exhaust manifold. Adjust water flow to eductor to maximum and allow water flow to be at
a maximum until the large amount of fumes produced during first stages of digestion have
subsided. (Usually 5-7 minutes, depending on moisture content and size of sample). Reduce
water flow to the point where all fumes are removed.
CAUTION: If maximum water flow to the eductor is allowed to continue throughout
entire digestion, the removal of too much acid could take place, resulting in caking of sample
contents contained in the digestion tubes and/or nitrogen loss. Remove only those fumes that
have been expelled to the top of the digestion tubes. At the end of the digestion period, remove
digestion tubes from digestor for cooling. Leave exhaust manifold in place on top of the tubes
during removal and cooling period.
Tile exhaust manifold to the rear to allow drainage of acid from the manifold to the
eductor after cooling period. Place exhaust manifold on stand allowing drip pan to collect all
acid expelled from the manifold. Drip pan is to be placed directly under stand to catch acid
drainage from manifold. This drainage can be held to a minimum if exhaust manifold is tilted to
the rear to allow drainage of acid into the eductor. Stand and drip pan is not provided with
Model #23540.