Labconco Two and Six-Place (Macro) Kjeldahl Distillation Systems 2125603 - Manual (Page 15)

Chapter 3: Normal Operation & Routine Maintenance
Product Service 1-800-522-7658 11
Clean-Up and Cosmetic Guidelines
• Keeping the Kjeldahl Digestion System clean will preserve the
appearance and improve life of the equipment.
• The equipment can be kept clean by washing with a weak solution of
sodium hydroxide and rinsing with clear water.
• Sulphate, a salt of Sulfuric Acid, may build up between the channel
support and the fume removal manifold. Neutralize this with a weak
solution of sodium hydroxide periodically to keep the unit clean.
Fume Removal Manifold Suction Adjustment
The suction along the fume removal manifold is adjusted as follows:
Two Place Digestion System
Suction is adjusted by changes in the water supply flow rate. The suction
may be decreased by decreasing the flow rate.
Blower Exhaust System
No adjustment is required on the suction pressure at the manifold when used.
The remote blower should be inspected annually for debris, proper operation,
and checked for adequate airflow as specified on pages 11-12 of this manual.
Exhaust Systems Maintenance
Sometimes the suction in the nipples is reduced due to obstruction within the
exhaust system. These obstructions can usually be washed from the fume
pipe, piping assembly or water ejector by boiling water in a number of flasks
placed on the digestion heaters. The blower or water aspirator should be in
operation to draw the steam through the fume pipe.
Digestion Drip Shield
The drip shield is constructed of stainless steel and is resistant to most acid attack.
Acid spills can however cause discoloration and eventual marring of the surface
unless the following proper procedures are followed in their clean up.
1. Promptly wash down all major acid spills contained by the shield.
2. Periodically clean the stainless surface with any residential
stainless steel sink cleaning compound.
3. After cleaning, renew the bright shiny appearance by lightly
sanding with 220 grade emery paper.
The Two-Place Kjeldahl Digestion Systems does not feature a drip shield
with a drained tube.