Operating instructions

METTLER TOLEDO DL36 27
Error messages and malfunctions
Fault
Drift too high
Reagent consump-
tion too high
End point not
reached or reached
too late
Poor reproducibility
of the results
Possible causes
Leaks in the system
Capacity limits of the anolyte/catholyte
reached or "wrong" reagent used
Membrane wetted with moisture or
cracked
Anode touching the membrane
Detection electrode contaminated or
faulty
Reagents exposed to direct sunlight
Detection electrode contaminated or
faulty
Capacity limits of the anolyte/catholyte
reached
Deposits on the anode surface
Anode touching the membrane
Drift stop set to "off"
Drift stop value too low
Side reactions
Capacity limits of the anolyte/catholyte
reached
Detection electrode contaminated or
faulty
Moisture content of the sample too
high/low
Drift too high
Reagent consumption too high
Drift stop value too high
Capacity limits of the anolyte/catholyte
reached
Measures
Change septum and drying agent,
(apply very thin coating of grease to
glass joints)
Change reagents
Clean inner burette or replace
Insert anode adjustment element
between membrane and anode and
set a distance between 1.5 mm and
2 mm
Clean/replace detection electrode
Protect instrument against direct
sunlight
Clean/replace detection electrode
Change reagents
Clean inner burette
Insert anode adjustment element
between membrane and anode and
set a distance between 1.5 mm and
2 mm
Set "drift stop" to "on" and enter value
Enter a larger drift stop value
Use a different KF reagent (e.g. for
ketones)
Change reagents
Clean/replace detection electrode
Adjust amount of sample (see Section
9.2)
See "Drift too high".
See "Reagent consumption too high"
Enter lower drift stop value
Change reagents