Metrohm 901 Titrando User Manual download pdf (Page 50)

6.1 General

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901 Titrando

6 Troubleshooting

6.1 General

Problem Cause Remedy

The "On" LED is not

illuminated, even

though the instru-

ment is connected

to the power supply.

The Touch Control or the

computer has not been

switched on yet or the

plugs are not correctly

plugged in.

1. Check the plug connections.

2. Switch on the Touch Control or the com-

puter.

6.2 Karl Fischer titration

Problem

Cause Remedy

The drift is very high

during conditioning.

The titration cell is leaking. ￭ Check the seals and the septum. Replace if

necessary.

￭ Replace the molecular sieve.

The drift becomes

greater after each

titration.

The sample releases water

very slowly.

￭ Adjust the method.

￭ Add solubility promoter.

￭ Increase the temperature (possibly using a

KF oven).

￭ See technical literature.

A side reaction is taking

place.

￭ Use special reagents.

￭ Adjust the method (increase/decrease the

temperature, external extraction).

￭ See technical literature.

The pH value is no longer

in the optimum range.

Add buffer (see technical literature).

The titration will not

be finished.

The titration cell is leaking. ￭ Check the seals and the septum. Replace if

necessary.

￭ Replace the molecular sieve.

The minimum increment is

too low.

Select the user-defined titration rate and

increase the minimum volume increment (see

manual/help of the software used).

The stop criterion is unsuit-

able.

Adjust the control parameters (see manual/

help of the software used):

￭ Increase the stop drift.

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Metrohm 901 Titrando User Manual Page 50

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