Metrohm 831 KF - User Manual

Questions and Answers

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Ryan BurkeAug 5, 2025
Why is the drift too high in my Metrohm Measuring Instruments?
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  William CarpenterAug 6, 2025
  High drift in Metrohm Measuring Instruments can be caused by moisture in the titration vessel. To resolve this, shake the titration vessel. Other causes include exhausted or contaminated reagent (exchange the reagent), exhausted molecular sieve (check the molecular sieve), a pierced septum (check the septum), faulty seals (check the seals), rough ground joint sleeves (check the ground joint sleeves), a polluted or moist generator electrode diaphragm (check the generator electrode diaphragm), or a sample matrix that consumes iodine (change the reagent more often). Also, ensure the seals are screwed tight and allow the instrument to run overnight.
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Mary RaymondAug 10, 2025
What to do if the result is too high on Metrohm Measuring Instruments?
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  charlesharrisonAug 10, 2025
  If you are getting results that are too high with your Metrohm Measuring Instruments, it could be due to a titration vessel that hasn't been properly conditioned. Try shaking the vessel and wait until the drift has stabilized. Another reason may be that your sample contains substances which can be oxidized. You can also set the generator current to 400 mA and set a higher stop drift. The drift correction might be too small, especially with unstable drift or manual drift correction.
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Matthew NealAug 14, 2025
How to fix unstable drift in Metrohm 831 KF?
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  Darius MoonAug 14, 2025
  Unstable drift in Metrohm Measuring Instruments can be addressed by ensuring efficient mixing without air bubbles by stirring and resetting the control parameters to standard values.
M
michael34Aug 18, 2025
How to shorten titration times on Metrohm Measuring Instruments?
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  Scott TerryAug 18, 2025
  If titration times are too long with your Metrohm Measuring Instruments, wait until the drift during conditioning becomes stable. Also, set a higher stop drift, set the control range smaller and the max.rate higher.
A
Anthony KellyAug 23, 2025
What causes low results in Metrohm Measuring Instruments?
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  Kevin TorresAug 23, 2025
  Low results in Metrohm Measuring Instruments may occur if the drift correction is too large, the stop drift is too high, or the min.rate is too low. Another cause may be that the sample releases iodine.
K
Kenneth NortonAug 27, 2025
Why are the results widely scattered on Metrohm 831 KF Measuring Instruments?
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  marissa70Aug 27, 2025
  Widely scattered results with Metrohm Measuring Instruments can stem from an inhomogeneous sample or poor reproducibility of sample addition. Unstable drift may also contribute to this issue.
C
Christine PriceAug 31, 2025
How to correct oven parameters in Metrohm Measuring Instruments Coulometer report?
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  Alexandra CarrAug 31, 2025
  To correct wrong oven parameters in the Coulometer report of your Metrohm Measuring Instruments, switch off the report output at the oven.

Summary

The wet chemistry workplace

Principle of coulometric KF determinations

Explains the fundamental principles of coulometric Karl Fischer titration.

Titration vessel setup

Optimal working conditions

Manual operation

Configuration, key <CONFIG>

Covers instrument configuration settings, including monitoring and peripheral units.

Mode selection, key <MODE>

Explains how to select different operating modes like KFC, KFC-B, BLANK, and GLP.

Parameters, key <PARAM>

Details how to set control, titration, and statistics parameters for analysis.

Result calculations

Explains how to define and manage calculation formulas for results.

Data output

Operation via RS232 Interface

General rules

Remote control commands

Comprehensive overview and detailed description of available remote control commands.

Properties of the RS 232 Interface

Error messages, troubleshooting

Troubleshooting

A table of common problems with their possible causes and remedies.

Error and special messages

Lists and explains various error and special messages displayed by the instrument.

Preparations

Coulometer setup

Connecting Coulometer to Dosino

Metrohm 831 KF Specifications

General

Type	Karl Fischer Titrator
Measuring Range (Water)	0.001% to 100%
Electrode	Double Pt electrode for indication
Interface	RS-232
Power Supply	100-240 V, 50/60 Hz
Dimensions	160 mm
Weight	Approx. 4 kg