Labconco Open Combination (Macro) Kjeldahl Systems 21237 Series - Manual (Page 7)

Chapter 1: Introduction
Product Service 1-800-522-7658 4
3. Acid Fume Blower Exhaust System. Located on the left side of the
unit, this blower removes excess sulfuric acid fumes from the digestion
flasks. The blower is direct-drive with corrosion resistant impeller wheel.
The blower draws the sulfuric acid fumes through the CPVC digestion
manifold and discharges the fumes under positive pressure out through a
duct work system connected to the buildings exterior. The 6" exhaust
stack of the blower must be connected to a leak-tight PVC ductwork
system that vents 10 ft (3 meters) above the building roof.
4. Acid Fume Water Aspirator Exhaust System. A water aspirator fume
removal system located on the left side of the digestion fume manifold is
alternatively available on Kjeldahl systems. The water aspirator draws
excess acid fumes by producing a vacuum in the digestion manifold and
the flask nipples. The acid fumes are dissolved in the water and flushed to
a 3-inch drain connection. The water ejector includes an air-vent pipe
connection, which must to ducted to the roof of the building. The vent
pipe prevents an air-lock from occurring within the water aspirator. The
water aspirator requires a 3/4" NPT water connection with 60 psig and 6-
8 gallons per minute flow rate in order to operate.
5. Temperature Gauge The condensation rack behind the upper distillation
heating elements requires cooling water. The temperature of the
distillation cooling water can be adjusted to promote condensation and
suit individual requirements with the flow control valve handle, located
below the distillation heaters. Water temperature is indicated on the
thermometer, which is located at the water outlet of the distillation
manifold. The water connections are 3/4" NPT and the supply line should
be 1/2" minimum for proper water flow through the unit. For facilities
where the ground water temperature exceeds 80°F (27°C), a recirculation
water chiller system will be required to achieve sufficient condensation
results.
6. Distillation Condensation Manifold Epoxy coated steel outer columns
with stainless steel inner condensation columns provide long life. Each of
the six column manifold features 3/4" NPT tap water inlet and outlets for
easy plumbing connections.