multi N/C 2100S (duo, pharma)
Function and design
21
3.1.3
Combustion system
The combustion system is behind the left side wall of the analyzer.
The combustion furnace is a resistor-heated vertical furnace for digestion temperatures
of up to 950 °C.
A combined combustion furnace for vertical and horizontal operation can optionally be
installed for operation with the Double Furnace module for the analysis of solid samples.
The combustion tube (reactor) consists of quartz glass. It is filled with catalyst and auxil-
iary material. If the effectiveness of the catalyst decreases, the combustion tube must be
filled again.
The furnace head is fitted to the top opening of the combustion tube. At the bottom
end, the combustion tube is connected to the condensation coil via a fork clamp.
Figure 11Combustion furnace
3.1.4
Measuring gas drying and cleaning
Condensation coil and TIC condensation module
The condensation coil and TIC condensation module are mounted on a carrier plate that
is attached on the right-hand side of the combustion furnace.
The glass condensation coil quickly cools the measuring gas. The water vapor con-
denses. The measuring gas and water mixture is routed to the TIC condensate container
via a hose.
The TIC condensation module consists of the TIC condensate container and the cooling
block which surrounds the glass container in the upper part.
In the lower part of the container, a glass drip has been integrated for the effective ex-
pulsion of the generated CO
2
. The sample for TIC detection is dosed from above through
the TIC lock. The phosphoric acid pump provides phosphoric acid (10 %) for each TIC de-
termination via the top side connection on the glass container.
The cooling block dries the measuring gas by freezing out the water vapor. The dry mea-
suring gas is routed out of the TIC condensate container via the side connection of the
TIC lock. The measuring gas drying is maintenance-free.
