Buchi DuMaster D-480, Руководство по эксплуатации

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Operating instructions DuMaster D-480 ©BÜCHI Labortechnik AG
4 - Understanding the instrument and planning its use 44
I Mechanical sample insertion and O
2
dosing system
II Furnace area and reaction zone
III Gas drying
IV Detector
Mechanical sample insertion and O
2
dosing system (I)
The following table describes the components of the unit and their functions:
Part Name Function
1 Carousel 
holds all samples in a series.

transports the current sample into the ball valve
2 Ball valve with Ni flap 
allows the metered addition of O
2
during the combustion.

holds the current sample.

shuts the current sample off from the ambient air.

allows the system to displace any ambient air.

transports the current sample into the combustion tube.

protects the ball valve from contamination.
For details on sample insertion, cf.
Sample insertion and initiation of measurement
(on page 47).
Furnace area and reaction zone (II)
The following table describes the components of the unit and their functions:
Part Name Function
3 Furnace 
holds the combustion tube, post combustion tube and
reductor/regainer at a constant temperature and thereby
ensures reproducible analysis results.
4 Combustion tube with tube
filling

Space for complete combustion of the sample including
combustion catalyst.

Binds disturbing alkali and earth alkali elements.
5 Ash crucible 
Holds combustion residues and sample packing of
analyzed samples; for fast, easy emptying without
replacing the combustion tube.
6 Post combustion tube with
tube filling

Oxidation of the combustion products.
7 Reductor 
Reduces NO
X
to N
2
.

Binds volatile halogen compounds and sulfurous
compounds.
For details on the processes in the furnace area, cf. Substance digestion and preparation of the
reaction gas mixture.
Gas drying (III)
The following table describes the components of the unit and their functions:
Part Name Function
8 Drying tube, gas drying and
water condenser

Removes H
2
O from the measuring gas.