Metrohm 756 KF Coulometer - Manual (Page 5)

Contents
756/831 KF Coulometer, Instructions of Use I
Contents
1 Introduction .......................................................... 1
1.1 Parts and controls............................................................................... 2
2 The wet chemistry workplace ............................. 4
2.1 Principle of coulometric KF determinations...................................... 4
2.2 Titration vessel setup.......................................................................... 5
2.3 Your first determination...................................................................... 6
2.4 Generator electrode without diaphragm ........................................... 7
2.4.1 Reagents.........................................................................................7
2.4.2 Cleaning..........................................................................................7
2.5 Generator electrode with diaphragm................................................. 8
2.5.1 Reagents.........................................................................................8
2.5.2 Cleaning..........................................................................................8
2.6 Tips for working with water standards .............................................. 9
2.6.1 Recommendations for practise ......................................................9
2.7 Sample addition ................................................................................ 10
2.7.1 Sample size ..................................................................................10
2.7.2 Liquid samples .............................................................................10
2.7.3 Solid samples ...............................................................................10
2.7 Optimal working conditions ............................................................. 11
2.7.1 Drift ...............................................................................................12
2.7.2 Reagent exchange........................................................................13
2.7.3 Indicator electrode........................................................................13
3 Manual operation ............................................... 14
3.1 Keypad............................................................................................... 14
3.2 Principle of data input....................................................................... 15
3.3 Text input ........................................................................................... 16
3.4 Configuration, key <CONFIG>........................................................ 17
3.4.1 Reagent exchange procedure with Dosino..................................25
3.5 Mode selection, key <MODE> ........................................................ 26
3.6 Parameters, key <PARAM>............................................................. 27
3.6.1 Titration sequence ........................................................................31
3.6.2 Control parameters and Ipol ........................................................32
3.6.3 Drift ...............................................................................................32
3.6.4 Current at the generator electrode ...............................................33
3.7 Result calculations............................................................................ 34
3.8 Statistics calculations....................................................................... 37
3.9 Common variables ............................................................................ 39
3.10 Data output ........................................................................................ 40
3.10.1 Reports for the output at the end of a determination .................41
3.10.2 Additional possibilities for report outputs...................................42
3.10.3 Display of the titration curve .......................................................42
3.11 User name, key <USER>................................................................. 43
3.12 Method memory, key <USER METH> ............................................ 44