Metrohm has developed the 831 KF coulometer, which determines even ultratraces of water with high accuracy.
Other features are its compact design, flexibility, and easy operation.
On the backlit LCD screen, the user can graphically follow the course of the Karl Fischer water determination (water as a function of time).
In addition, the curves of voltage and drift versus time can be printed out or viewed on a PC screen.
These features allow the user to assess the determination and assist in method development.
The 831 KF coulometer is suitable for routine operations.
Even with its extensive capabilities, it is easy to operate.
It has an expert mode as well as a standard mode.
The expert mode allows the use of all the features of this device.
In the standard mode, only functions needed in routine work are accessible; operation in this mode is simple and requires very few keystrokes.
Connecting a 700 Dosino to the 831 KF coulometer allows you to siphon off the contents of the coulometric cell and fill it with fresh reagent.
As the KF vessel remains closed, no humidity can enter the system.
Within a minimum of time, the analysis cell is reconditioned.
The coulometric cell without diaphragm works with only one reagent and is insensitive to interferences.
However, as not all applications can be solved with this cell, Metrohm also offers a cell with diaphragm.
The 831 KF coulometer stores up to 100 different methods in its internal memory; these methods can easily be transferred to and reloaded via the RS-232C interface from a PC.
Use of a KF oven is recommended for samples that cannot be introduced directly into the KF cell.
The 832 KF oven can be used if only a few samples need to be processed.
However, the 774 oven sample processor is suitable for analysis of a large number of samples.
When combined with the 831 KF coulometer, this sample changer allows fully automated water determinations in up to 35 samples.
The analysis system can be operated as a stand-alone unit, or it can be completely controlled by Metrohm titration software.
It includes a built-in clock, 8-digit date format (YYYY-MM-DD), programmable service and validation intervals, and programmable upper limits for contents and reagent consumption during automated analysis.
The 831 KF coulometer allows the complete and clear documentation of all determinations performed.
The result output complies with GLP and includes the designation and the serial number of the instrument, software version, date, user name, and method used.
GLP and ISO 9000 functions, such as service or validation intervals, alert you in time for the necessary tests.
The KF reagent can be monitored with regard to the number of determinations carried out, its useful life span, drift value, or capacity.
Whenever the reagent has to be exchanged, the corresponding request is issued automatically.
To avoid errors, the user can also set limits for the sample weight or volume and for the result.
If one of these quantities lies outside the set limits, the corresponding warning message appears in the display and report, and the remote interface emits a signal.
The 831 KF coulometer has a special GLP mode that eases the periodic testing of the instrument: the user simply calls up this mode and carries out the validation according to Metrohm Application Bulletin 273.
