Metrohm 791 VA Detector - Manual (Page 5)

Table of contents
791 VA Detector
I
Table of contents
1 Introduction
...........................................................................................
1
1.1 Instrument description .............................................................................1
1.2 Parts and controls.....................................................................................2
1.3 Information on the Instructions for Use ................................................4
1.3.1 Organization ..................................................................................4
1.3.2 Notation
and pictograms ..............................................................5
1.4 Safety notes................................................................................................6
1.4.1 Electrical safety..............................................................................6
1.4.2 General
precautionary rules..........................................................6
2 Installation
..............................................................................................
7
2.1 Setting up the instrument.........................................................................7
2.1.1 Packaging......................................................................................7
2.1.2 Check ............................................................................................7
2.1.3 Location.........................................................................................7
2.1.4 Arrangement
of the instruments....................................................7
2.2 Mains connection ......................................................................................8
2.2.1 Setting the mains voltage..............................................................8
2.2.2 Fuses .............................................................................................9
2.2.3
Mains cable and mains connection..............................................9
2.2.4 Switching the instrument on/off.....................................................9
2.3 656 Electrochemical detector................................................................10
2.3.1 Installation and startup................................................................10
2.3.2 Connection
to 791 VA Detector...................................................10
2.4 6.5303.030 ELCD cell for IC...................................................................11
2.4.1 Assembling the ELCD cell...........................................................11
2.4.2 Connection to 791 VA Detector...................................................13
2.5 Analog output connections ...................................................................14
3 Operation
...............................................................................................
15
3.1 Electrochemical detection .....................................................................15
3.1.1 Classes of substances which can be determined......................15
3.1.2 Influence on detector signal........................................................16
3.1.3 Selection of polarization voltage .................................................17
3.1.4 Procedure for unknown substances ...........................................17
3.1.5 Practical information about ELCD...............................................18
3.2 Electrodes.................................................................................................20
3.2.1 Working electrodes .....................................................................20
3.2.2 Reference electrode ....................................................................22
3.2.3 Auxiliary electrode .......................................................................22
3.3 Operating element functions.................................................................23
3.4 Startup.......................................................................................................26
3.4.1 Preparing the ELCD cell..............................................................26
3.4.2 Zero balancing and equilibration phase .....................................27
3.4.3 Measuring procedure..................................................................29