Metrohm 940 Professional IC Vario ONE/SeS/PP/Prep 2 - Manual (Page 13)

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1 Introduction
940 Professional IC Vario ONE/SeS/PP/Prep 2 (2.940.1520)
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Peristaltic pump
The peristaltic pump is used for pumping sample and auxiliary solutions. It
can rotate in both directions.
Metrohm CO
2
Suppressor (MCS)
The Metrohm CO
2
Suppressor (MCS) removes the CO
2
from the eluent
flow. This lowers the background conductivity, improves detection sensi-
tivity and minimizes the injection peak and carbonate peak.
Detector
Metrohm offers a series of different detectors for various analysis tasks. A
suitable detector type must be ordered as a separate accessory.
Sample degasser
The sample degasser removes gas bubbles and dissolved gases from the
sample.
6-port valve
The 6-port valve mimics the injection valve in its design. It is used during
sample preparation and serves as a unit for switching between two differ-
ent liquids, such as switching between sample dilution and direct injection
during sample dilution.
Separation column
The intelligent separation column separates different components accord-
ing to their interactions with the column. Metrohm separation columns
are equipped with a chip where their technical specifications and history
(start-up, operating hours, etc) are stored.
1.2 Intended use
The 940 Professional IC Vario ONE/SeS/PP/Prep 2 is used for the determi-
nation of anions or polar substances with sequential suppression using ion
chromatography.
Sequential suppression consists of:
￭ Chemical suppression with a Metrohm Suppressor Module (MSM) and
subsequent
￭ CO2 suppression with the Metrohm CO2 Suppressor (MCS).
Background conductivity is reduced to a minimum with sequential sup-
pression.
The instrument can also be used as needed for the determination of cati-
ons or anions without chemical suppression.