Metrohm 920 Absorber Module - Manual (Page 9)

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1 Introduction
920 Absorber Module
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1 Introduction
1.1 Instrument description
The 920 Absorber Module forms part of the Combustion IC system, which
includes a Combustion Module and an ion chromatograph in addition to
the 920 Absorber Module. The Combustion IC system can be used for
digesting solid and liquid combustible samples. The Combustion IC sys-
tem's prime application is the determination of halogenides and sulfur.
The 920 Absorber Module is the connecting link between combustion and
IC analysis in the Combustion IC system. The 920 Absorber Module
absorbs the combustion gases in an aqueous medium and transfers it into
the ion chromatography system. The 920 Absorber Module performs the
necessary Liquid Handling and enables the application of various sample
preparation techniques, such as matrix elimination, preconcentration and
automated calibration.
The 920 Absorber Module is comprised of the following modules:
Dosino for ultrapure water
A Dosino with a 5 mL dosing unit is inserted in the back in the 920
Absorber Module. This Dosino serves to dose water for the water infeed
during combustion and for the transfer of the absorption solution to the
IC instrument. Furthermore, it is used for the Liquid Handling.
Dosino for the absorber solution
A Dosino with a 10 mL dosing unit is inserted in the front of the 920
Absorber Module. This Dosino serves to dose the absorber solution into
the absorber tube.
10-port valve
The 10-port valve is the centerpiece of the Liquid Handling; it serves as a
switch-over point between the various liquid flows.
6-port valve
The 6-port valve serves as a switch-over point between the two liquid
flows. The sample loop allows a precisely defined sample amount to be
measured before it is transferred to the analyzer.
Absorber tube
The combustion gases are absorbed by a solution in the absorber tube.