Labconco Two and Six-Place (Macro) Kjeldahl Distillation Systems 2127603 - Manual (Page 6)

Chapter 1: Introduction
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Performance
The Two and Six-Place Kjeldahl Distillation Systems have been designed for
use in the determination of nitrogen (or ammonia) concentrations. By
calculation, nitrogen can be converted to protein values for products such as
plant tissues, meats and other food substances. Nitrogen determinations with
the (Macro) Distillation Systems can accommodate sample sizes up to 300-
400 mls, due to the size of the distillation flasks. Detailed procedures
developed by professional laboratory organizations such as American
Association of Analytical Chemists (AOAC) and American Association of
Cereal Chemists (AACC) should always be consulted for step by step
analytical procedures when operating this equipment. For methodology
precision and accuracy please consult the specific published method for the
type of sample or substance that will be analyzed.
Component Identification
1. Electric Heaters. 600-watt heaters are used in the distillation rack of the
units. Infinite control switches regulate each of the heaters. The curved
heater elements are provided and allow for the round base of the Kjeldahl
flasks, providing faster and more evenly distributed heat. All heaters and
temperature controllers are wired to a common subpanel electrical box,
for easy electrical connection to a facility electrical circuit.
2. Temperature Gauge. The condensation rack behind the distillation
heating elements requires cooling water. The temperature of the
distillation cooling water on the Six-Place Distillation System 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 Two-Place Distillation
Systems does not feature a flow control valve or temperature gauge. The
cooling 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, a recirculation water chiller
system will be required to achieve sufficient condensation results.
3. Distillation Condensation Manifold. Epoxy coated steel outer columns
with stainless steel inner condensation columns provide long life.