Metrohm 761 SD Compact IC - Manual (Page 9)

1.1 Instrument description
761 SD Compact IC / Instructions for Use 8. 761.1043
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1 Introduction
1.1 Instrument description
The 761 SD Compact IC is a version of the time-proven 761 Compact
IC which has been developed specifically for soft drink analysis. The
761 SD Compact IC is designed for determining phosphoric acid and
its intermediate products in soft drinks but also continues to offer all
functionalities of the original version.
The advantages of the 761 SD Compact IC over the conventional
methods of phosphoric acid analysis in soft drinks are its short analysis
times, its ease of operation and the option for automated sampling.
There is no need for time-consuming sample preparation and only
small quantities of chemicals are consumed (more environmentally
friendly).
The 761 SD Compact IC has a very compact housing accommodating
all equipment required for ion-chromatographic determination:
• Injection valve – this supplies the sample to the eluent stream by
switching over the flow paths.
• High-pressure pump – extremely low-pulsation dual piston pump
with a flow range of 0.2 to 2.5 mL/min and a maximum pressure
of 25 MPa (250 bar).
• Pulsation dampener – the pulsation dampener protects the sepa-
rating column reliably against damage even in the case of low-level
pressure fluctuations.
• Column chamber – perfect insulation of the housing not only cre-
ates thermally stable conditions for the separating column, but also
shields the system against electromagnetic interference.
• Column – Metrosep A Supp 1 HS anion column as IC separating
column; Metrosep RP Guard as protective precolumn.
• Suppressor – the Metrohm-Suppressor-Module (MSM) which is
already integrated features stable pressure characteristics, auto-
matic regeneration, high performance and optimum reproducibility.
• Peristaltic pump – integrated, two-channel peristaltic pump with a
flow rate of 0.5 to 0.6 mL/min for regeneration of the suppressor
module and aspiration of the sample for manual operation.
• Detector – conductivity detector with excellent temperature stabil-
ity. The detector temperature fluctuates by less than 0.01°C and
can be matched optimally to ambient conditions.