Metrohm 791 VA Detector - Manual (Page 7)

1.1 Instrument description
791 VA Detector
1
1 Introduction
1.1 Instrument description
The 791 VA Detector allows the use of electrochemical/amperometric
detection in IC and HPLC; various working electrodes are available de-
pending on the application. It can be used in series with another detec-
tor (e.g. 732 Conductivity detector) or simply as a «stand alone» detec-
tor.
The self-ventilating measuring cell functions according to the time-
proved wall-jet principle with three-electrode technology. A silver/silver
chloride system is used as the reference electrode and a solid gold pin
as the auxiliary electrode. The carbon paste electrode and the silver
electrode have proved to be the best working electrodes; but other
electrode materials such as glassy carbon, gold, platinum and impreg-
nated graphite are available for special applications.
The 791 VA Detector is available in the two following versions:
• 2.791.0010 VA Detector for HPLC
The measuring cell is built into the 656 Electro-
chemical detector.
• 2.791.0020 VA Detector for IC
The measuring cell belongs to the accessories and
is built into the 733 IC Separation Center.