Metrohm 851 Titrando - Manual (Page 6)

Table of contents
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IV ￭￭￭￭￭￭￭￭
851 Titrando
3.5.4 Coulometer cell with aspiration equipment (utilization with
Dosino) .................................................................................. 30
3.5.5 Coulometer cell with Karl Fischer oven ................................... 31
3.5.6 Coulometer cell with sample changer .................................... 31
3.6 Connecting sensors ............................................................ 32
3.6.1 Connecting a generator electrode .......................................... 32
3.6.2 Connecting an indicator electrode ......................................... 32
3.6.3 Connecting a temperature sensor .......................................... 33
4 Coulometric titration 35
4.1 Principle of coulometry according to Karl Fischer .......... 35
4.2 Working with water standards ......................................... 36
4.2.1 Certified water standards ....................................................... 36
4.2.2 Practical recommendations .................................................... 36
4.3 Sample addition .................................................................. 38
4.3.1 Size of the sample size ........................................................... 38
4.3.2 Working with liquid samples .................................................. 38
4.3.3 Working with solid samples ................................................... 39
4.4 Optimum working conditions ........................................... 40
4.4.1 General ................................................................................. 40
4.4.2 Drift ...................................................................................... 40
4.4.3 Reagent replacement ............................................................. 41
4.4.4 Indicator electrode ................................................................ 41
5 Operation and maintenance 42
5.1 General notes ...................................................................... 42
5.1.1 Care ...................................................................................... 42
5.1.2 Maintenance by Metrohm Service .......................................... 42
5.2 Generator electrode ........................................................... 43
5.2.1 Generator electrode without diaphragm ................................ 43
5.2.2 Generator electrode with diaphragm ..................................... 43
5.3 Quality Management and qualification with
Metrohm ............................................................................. 44
6 Troubleshooting 46
6.1 General ................................................................................ 46
6.2 Karl Fischer titration .......................................................... 46
6.2.1 ............................................................................................. 46
7 Appendix 48
7.1 Remote interface ................................................................ 48
7.1.1 Pin assignment of the remote interface .................................. 48