Troubleshooting
multi N/C 2100S (duo, pharma)
100
¡
NDIR-based drift:
Unsuitable integration criteria.
The software ends measurement too
early.
¡
Check the method settings.
¡
If necessary, increase the maximum in-
tegration time.
Error
Canula faulty
Cause
Remedy
¡
The injection canula is corroded due to
the sample matrix and the temperature.
¡
The canula is clogged.
¡
Misting up of the canula is normal.
¡
Replace the canula if the sample is no
longer dosed as a cohesive jet but is
sprayed.
Error
Autosampler does not draw in sample
without air bubbles
Cause
Remedy
¡
Leaking syringe.
¡
Check the dosing syringe. If it is leaky,
replace the syringe.
¡
The canula is clogged.
¡
Remove the canula and clean it in an ul-
trasonic bath.
¡
Replace the canula.
¡
The dosing syringe is not free of grease.
¡
Clean the dosing syringe:
Fill the syringe with a weak tenside solu-
tion. Acting time: 30 min
Fill the syringe with 0.1 n NaOH. Acting
time: 10 min
Fill the syringe with 0.1 n HCl. Acting
time: 10 min
Flush the syringe thoroughly with ultra-
pure water between cleaning steps and
after cleaning.
Error
Carry-over
Cause
Remedy
¡
Insufficient syringe flushing.
¡
Flush the dosing syringe with sample
before the next injection. To do this, edit
the method and enter a "3" in column 1
under Rinse cycles, no flush is usually re-
quired for all further measurements. En-
ter "0" here in the table columns.
¡
Sample dosed onto the reactor wall.
¡
Dose the sample vertically into the reac-
tor.
Error
Low results
(general)
Cause
Remedy
¡
The catalyst is used up.
¡
Replace the catalyst.
¡
The system is leaking.
¡
Check the system for leaks.
¡
Faulty dosing.
¡
Check the dosing.
¡
Incorrect injection volume.
¡
For manual sample supply: Supply the
sample volume set in the method.
¡
The z-axis coordinate adjustment for the
automatic locks is incorrect. The system
leaks during injection due to this.
¡
Adjust the autosampler.
¡
For automatic locks: The septum on the
syringe no longer seals.
¡
Replace the septum on the syringe.
¡
Particulate samples are not or are insuf-
ficiently stirred.
¡
Stir particulate samples.
