PlasmaQuant 9100 (Elite)
Function and design
15
Bonnet
Induction coil
Outer tube
Inner tube
Injector
Plasma gas
Auxiliary gas
Sample aerosol
in the nebulizer
gas
Figure 2 Torch diagram with gas flows
The torch can be disassembled into its individual parts ("demountable torch"). Worn indi-
vidual parts can be replaced individually, such as the outer tube, which is subject to high
thermal loads. Care must be taken during assembly to ensure that the individual parts
are inserted gas-tight and especially to check the proper fit of the injector. The standard
torch (made of quartz glass with injector, 2 mm) is also available as a unit. The one-
piece torch is cleaned as a whole; disassembly and subsequent assembly are omitted. On
the other hand, this torch has to be completely replaced when worn.
Figure 3 Demountable torch
Figure 4 One-piece torch
A special design (V Shuttle Torch) is used in the emission spectrometer. The upright po-
sitioning of the torch reduces clogging and soot formation.
The torch is mounted onto the rail guide with the holder (shuttle). This automatically
connects the internal gas inlets for the plasma and the auxiliary gas. The torch is then
moved by hand along the rail guide to the plasma compartment where it locks in the ad-
justed operating position.
3.2.2
Sample supply
Pump, nebulizer and spray
chamber
A hose pump evenly conveys the measurement solution to the nebulizer. The rotational
speed of the pump and the diameter of the pump tubing used determine the amount of
sample delivered. By using the pump, sample introduction into the nebulizer, and thus
also the sensitivity of the measurement signal, is independent of the viscosity of the
measurement solution.