Document Outline

• Table of contents
• 1 Introduction
  • 1.1 Instrument description
  • 1.2 Parts and controls
  • 1.3 Information on the Instructions for Use
    • 1.3.1 Organization
    • 1.3.2 Notation and pictograms
  • 1.4 Safety notes
    • 1.4.1 Electrical safety
    • 1.4.2 General precautionary rules
• 2 Installation
  • 2.1 Setting up the instrument
    • 2.1.1 Packaging
    • 2.1.2 Check
    • 2.1.3 Location
    • 2.1.4 Arrangement of the instruments
  • 2.2 Mains connection
    • 2.2.1 Setting the mains voltage
    • 2.2.2 Fuses
    • 2.2.3 Mains cable and mains connection
    • 2.2.4 Switching the instrument on/off
  • 2.3 656 Electrochemical detector
    • 2.3.1 Installation and startup
    • 2.3.2 Connection to 791 VA Detector
  • 2.4 6.5303.030 ELCD cell for IC
    • 2.4.1 Assembling the ELCD cell
    • 2.4.2 Connection to 791 VA Detector
  • 2.5 Analog output connections
• 3 Operation
  • 3.1 Electrochemical detection
    • 3.1.1 Classes of substances which can be determined
    • 3.1.2 Influence on detector signal
    • 3.1.3 Selection of polarization voltage
    • 3.1.4 Procedure for unknown substances
    • 3.1.5 Practical information about ELCD
    • Cleanliness
    • Pulsation
    • Eluent
    • Stationary phase
    • Sample solution
  • 3.2 Electrodes
    • 3.2.1 Working electrodes
    • Glassy carbon electrode GCE
    • Ultra-Trace graphite electrode
    • Carbon paste electrode CPE
    • Metal electrodes
    • Amalgamated electrode
    • 3.2.2 Reference electrode
    • 3.2.3 Auxiliary electrode
  • 3.3 Operating element functions
    • Mains switch
    • Relative compensation current
    • Absolute compensation current
    • Changeover Stand-by/Measure
    • Damping
    • Multiplication of by a factor of 5
    • Multiplication of by a factor of 50
    • Polarity of
    • Overload display
    • Polarization voltage
    • Current measuring sensitivity
    • Polarity of analog output
    • Full-scale deflection of analog output
  • 3.4 Startup
    • 3.4.1 Preparing the ELCD cell
    • 3.4.2 Zero balancing and equilibration phase
    • 3.4.3 Measuring procedure
• 4 Maintenance – Malfunctions
  • 4.1 Maintenance and servicing
    • Care
    • Maintenance by Metrohm service
  • 4.2 Shutdown
  • 4.3 Malfunctions and their rectification
  • 4.4 Instrument test with the dummy cell
    • 4.4.1 Check of "meas" and "damp" commutators and of current amplifier offset
    • 4.4.2 Check output voltage
    • 4.4.3 Check of current compensation
    • 4.4.4 Check of current and voltage overload
    • 4.4.5 Check sensitivity knob
    • 4.4.6 Check of noise from current amplifier
• 5 Appendix
  • 5.1 Technical data
  • 5.2 Standard equipment
    • 5.2.1 2.791.0010 VA Detector for HPLC
    • 5.2.2 2.791.0020 VA Detector for IC
  • 5.3 Optional accessories
  • 5.4 Warranty and conformity
    • 5.4.1 Warranty
    • 5.4.2 EU Declaration of conformity
  • EU Declaration of Conformity
    • 5.4.3 Certificate of conformity and system validation
  • 5.5 Index