BUCHI DuMaster D-480 - Manual (Page 44)

Operation Manual D-480 ©BÜCH 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
Symbols
The following list names the functional and basic symbols:
Two-way valve Pressure sensor Gas separation
Three-way valve Loop Measuring cell
Check valve Heated tube Sensor
Throttle Drying Hose line
Flow controller Combustion Copper tube
Flow sensor Post combustion Reduction
Pressure contoller Actuator
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 and
allows the system to displace any ambient air with a
CO
2
/O
2
gas mixture.
 transports the current sample into the combustion tube.
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, reduction tube and post
combustion tube 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.