Thermo Scientific EA IsoLink IRMS System, Руководство по эксплуатации

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2
Analytical Principles
Preparation of Reactors and Adsorption Filter
46 EA IsoLink IRMS System for CNSOH Operating Manual Thermo Scientific
H and O Configurations
These configurations require the use of a special ceramic reactor, as shown in Figure 41 , and the use of
a trap filled with Carbosorb ( Ascarite® P/N 33835236) and Magnesium Perchlorate
(P/N 338 21900). after the reactor and before the HeM valve block. This additional trap is not
included in delivery.
Figure 41. High Temperature Conversion Reactor for H and O Analyses of Solid (A) and Liquid (B) samples
The filling of the trap is given in Figure 42 using quartz wool at top and end and to separate the filling
material.
Figure 42. CO
2
/H
2
O Trap Between High Temperature Conversion Reactor and He
M
Valve Block
Preparing the Reactors
According to the instrument configurations, the filling materials are introduced into the reactor in a
way to form a series of layers of defined dimensions. For a proper preparation of the filling layers, refer
to the filling diagram of the concerned instrument configuration, as described in the section
“Preparation of Reactors and Adsorption Filter” on page 44 . When using macro reactors (25 mm D)
then use the same packing instruction.
17 mm
60 mm
355 mm
15 mm
5 mm
5 mm
100 mm
15 mm
17 mm
60 mm
355 mm
15 mm
5 mm
5 mm
130 mm
15 mm
30 mm
270 m
m
270 m
m
A B
Reactor for H and O Configurations with EA IsoLink CN/OH
Reactor for solid sample
Ceramic tube
Reactor for liquid sample
Ceramic tube
Insert
Special insert
Glassy carbon reactor Glassy carbon reactor
Glassy carbon granulate
Glassy carbon granulate
Glassy carbon granulate
Glassy carbon granulate
Silver wool Silver wool
Silver wool
Silver wool
Quartz wool Quartz wool
Graphite crucible
IMPORTANT The filling of the reactor must be performed rigorously respecting the exact
proportions of the packing materials. The distance of 270 mm from the head of the ceramic tube to
the graphite crucible is of extreme importance, because the crucible must be placed in the hottest
zone of the furnace. Additionally avoid that any organic material enters the reactor.